案例介紹
本章主要介紹如何實(shí)現(xiàn)讓虛擬機(jī)處理數(shù)組和字符串，在虛擬機(jī)功能增強(qiáng)后，我們可以執(zhí)行數(shù)組類型計(jì)算和輸出字符串。本章需要新增實(shí)現(xiàn)數(shù)組指令；newarray、anewarray、arraylength、aload、astore、multianewarray、ldc，同時(shí)需要需要開發(fā)字符串池方法等。

數(shù)組在Java虛擬機(jī)中是給比較特殊的概念，主要有以下原因；
首先，數(shù)組類和普通的類是不同的。普通的類從class文件中加載，但是數(shù)組類由Java虛擬機(jī)在運(yùn)行時(shí)生成。數(shù)組的類名是左括號(hào)([)+數(shù)組元素的類型描述符；數(shù)組的類型描述符就是類名本身。例如，int[]的類名是[I，int[][]的類名是[[I，Object[]的類名是[Ljava/lang/Object;，String[][]的類名是[[java/lang/String;，等等。
其次，創(chuàng)建數(shù)組的方式和創(chuàng)建普通對(duì)象的方式不同。普通對(duì)象new指令創(chuàng)建，然后由構(gòu)造函數(shù)初始化。基本類型數(shù)組由newarray指令創(chuàng)建；引用類型數(shù)組由anewarray指令創(chuàng)建；另外還有一個(gè)專門的mulitianewarray指令用于創(chuàng)建多維數(shù)組。
最后，很顯然，數(shù)組和普通對(duì)象存在的數(shù)據(jù)也是不同的。普通對(duì)象中存放的是實(shí)例變量，通過putfield和getfield指令存取。數(shù)組對(duì)象中存放的則是數(shù)組元素，通過aload和astore系列指令按索引存取。其中可以是a、b、c、d、f、i、l或者s，分別用于存取引用、byte、char、double、float、int、long或者shore類型的數(shù)組。另外，還有一個(gè)arraylength指令，用于獲取數(shù)組長度。

環(huán)境準(zhǔn)備
1、jdk 1.8.0
2、IntelliJ IDEA Community Edition 2018.3.1 x64

配置信息
1、調(diào)試配置
2.1、配置位置：Run/Debug Configurations -> program arguments
2.2、配置內(nèi)容（執(zhí)行數(shù)組計(jì)算）：-Xjre “C:Program FilesJavajdk1.8.0_161jre” E:itstackgitistack-demoitstack-demo-jvmitstack-demo-jvm-08targettest-classesorgitstackdemotestBubbleSortTest
2.2、配置內(nèi)容（字符串的輸出）：-Xjre “C:Program FilesJavajdk1.8.0_161jre” E:itstackgitistack-demoitstack-demo-jvmitstack-demo-jvm-08targettest-classesorgitstackdemotestHelloWorld -verbose true -args 你好，java版虛擬機(jī)v1.0，歡迎你的到來。

代碼示例

itstack-demo-jvm-08 ├── pom.xml └── src└── main│ └── java│ └── org.itstack.demo.jvm│ ├── classfile│ │ ├── attributes {BootstrapMethods/Code/ConstantValue...}│ │ ├── constantpool {CONSTANT_TAG_CLASS/CONSTANT_TAG_FIELDREF/CONSTANT_TAG_METHODREF...}│ │ ├── ClassFile.java│ │ ├── ClassReader.java│ │ └── MemberInfo.java │ ├── classpath│ │ ├── impl│ │ │ ├── CompositeEntry.java│ │ │ ├── DirEntry.java │ │ │ ├── WildcardEntry.java │ │ │ └── ZipEntry.java │ │ ├── Classpath.java│ │ └── Entry.java │ ├── classpath│ │ ├── base│ │ │ ├── BytecodeReader.java│ │ │ ├── ClassInitLogic.java│ │ │ ├── Instruction.java│ │ │ ├── InstructionBranch.java│ │ │ ├── InstructionIndex8.java│ │ │ ├── InstructionIndex16.java│ │ │ ├── InstructionNoOperands.java │ │ │ └── MethodInvokeLogic.java│ │ ├── comparisons│ │ ├── constants│ │ ├── control│ │ ├── conversions│ │ ├── extended│ │ ├── loads│ │ ├── math│ │ ├── references│ │ │ ├── ANEW_ARRAY.java│ │ │ ├── ARRAY_LENGTH.java│ │ │ ├── CHECK_CAST.java│ │ │ ├── GET_FIELD.java│ │ │ ├── GET_STATIC.java│ │ │ ├── INSTANCE_OF.java│ │ │ ├── INVOKE_INTERFACE.java│ │ │ ├── INVOKE_SPECIAL.java│ │ │ ├── INVOKE_STATIC.java│ │ │ ├── INVOKE_VIRTUAL.java│ │ │ ├── MULTI_ANEW_ARRAY.java│ │ │ ├── NEW.java│ │ │ ├── NEW_ARRAY.java│ │ │ ├── PUT_FIELD.java│ │ │ └── PUT_STATIC.java│ │ ├── stack│ │ ├── store│ │ │ └── xastore│ │ │ ├── AASTORE.java │ │ │ ├── BASTORE.java │ │ │ ├── CASTORE.java │ │ │ ├── DASTORE.java│ │ │ ├── FASTORE.java│ │ │ ├── IASTORE.java│ │ │ ├── LASTORE.java │ │ │ └── SASTORE.java │ │ └── Factory │ ├── rtda│ │ ├── heap│ │ │ ├── constantpool│ │ │ ├── methodarea│ │ │ │ ├── Class.java │ │ │ │ ├── ClassMember.java │ │ │ │ ├── Field.java │ │ │ │ ├── Method.java │ │ │ │ ├── MethodDescriptor.java │ │ │ │ ├── MethodDescriptorParser.java │ │ │ │ ├── MethodLookup.java │ │ │ │ ├── Object.java │ │ │ │ ├── Slots.java │ │ │ │ └── StringPool.java │ │ │ └── ClassLoader.java │ │ ├── Frame.java│ │ ├── JvmStack.java│ │ ├── LocalVars.java│ │ ├── OperandStack.java│ │ ├── Slot.java │ │ └── Thread.java│ ├── Cmd.java│ ├── Interpret.java │ └── Main.java└── test└── java└── org.itstack.demo.test├── BubbleSortTest.java└── HelloWorld.java

代碼片段

ANEW_ARRAY.java

package org.itstack.demo.jvm.instructions.references;import org.itstack.demo.jvm.instructions.base.InstructionIndex16; import org.itstack.demo.jvm.rtda.Frame; import org.itstack.demo.jvm.rtda.OperandStack; import org.itstack.demo.jvm.rtda.heap.constantpool.ClassRef; import org.itstack.demo.jvm.rtda.heap.constantpool.RunTimeConstantPool; import org.itstack.demo.jvm.rtda.heap.methodarea.Class; import org.itstack.demo.jvm.rtda.heap.methodarea.Object;/*** http://www.itstack.org* create by fuzhengwei on 2019/4/29* create new array of reference*/ public class ANEW_ARRAY extends InstructionIndex16 {@Overridepublic void execute(Frame frame) {RunTimeConstantPool runTimeConstantPool = frame.method().clazz().constantPool();ClassRef classRef = (ClassRef) runTimeConstantPool.getConstants(this.idx);Class componentClass = classRef.resolvedClass();OperandStack stack = frame.operandStack();int count = stack.popInt();if (count < 0) {throw new NegativeArraySizeException();}Class arrClass = componentClass.arrayClass();Object arr = arrClass.newArray(count);stack.pushRef(arr);}}

ARRAY_LENGTH.java

package org.itstack.demo.jvm.instructions.references;import org.itstack.demo.jvm.instructions.base.InstructionNoOperands; import org.itstack.demo.jvm.rtda.Frame; import org.itstack.demo.jvm.rtda.OperandStack; import org.itstack.demo.jvm.rtda.heap.methodarea.Object;/*** http://www.itstack.org* create by fuzhengwei on 2019/4/29* get length of array*/ public class ARRAY_LENGTH extends InstructionNoOperands {@Overridepublic void execute(Frame frame) {OperandStack stack = frame.operandStack();Object arrRef = stack.popRef();if (null == arrRef){throw new NullPointerException();}int arrLen = arrRef.arrayLength();stack.pushInt(arrLen);}}

NEW_ARRAY.java

package org.itstack.demo.jvm.instructions.references;import org.itstack.demo.jvm.instructions.base.BytecodeReader; import org.itstack.demo.jvm.instructions.base.Instruction; import org.itstack.demo.jvm.rtda.Frame; import org.itstack.demo.jvm.rtda.OperandStack; import org.itstack.demo.jvm.rtda.heap.ClassLoader; import org.itstack.demo.jvm.rtda.heap.methodarea.Class; import org.itstack.demo.jvm.rtda.heap.methodarea.Object;/*** http://www.itstack.org* create by fuzhengwei on 2019/4/29*/ public class NEW_ARRAY implements Instruction {private byte atype;@Overridepublic void fetchOperands(BytecodeReader reader) {this.atype = reader.readByte();}@Overridepublic void execute(Frame frame) {OperandStack stack = frame.operandStack();int count = stack.popInt();if (count < 0) {throw new NegativeArraySizeException();}ClassLoader classLoader = frame.method().clazz().loader();Class arrClass = getPrimitiveArrayClass(classLoader, this.atype);Object arr = arrClass.newArray(count);stack.pushRef(arr);}private Class getPrimitiveArrayClass(ClassLoader loader, byte atype){switch (atype) {case ArrayType.AT_BOOLEAN:return loader.loadClass("[Z");case ArrayType.AT_BYTE:return loader.loadClass("[B");case ArrayType.AT_CHAR:return loader.loadClass("[C");case ArrayType.AT_SHORT:return loader.loadClass("[S");case ArrayType.AT_INT:return loader.loadClass("[I");case ArrayType.AT_LONG:return loader.loadClass("[J");case ArrayType.AT_FLOAT:return loader.loadClass("[F");case ArrayType.AT_DOUBLE:return loader.loadClass("[D");default:throw new RuntimeException("Invalid atype!");}}static class ArrayType {static final byte AT_BOOLEAN = 4;static final byte AT_CHAR = 5;static final byte AT_FLOAT = 6;static final byte AT_DOUBLE = 7;static final byte AT_BYTE = 8;static final byte AT_SHORT = 9;static final byte AT_INT = 10;static final byte AT_LONG = 11;}}

IASTORE.java

package org.itstack.demo.jvm.instructions.stores.xastore;import org.itstack.demo.jvm.instructions.base.InstructionNoOperands; import org.itstack.demo.jvm.rtda.Frame; import org.itstack.demo.jvm.rtda.OperandStack; import org.itstack.demo.jvm.rtda.heap.methodarea.Object;/*** http://www.itstack.org* create by fuzhengwei on 2019/4/29*/ public class IASTORE extends InstructionNoOperands {@Overridepublic void execute(Frame frame) {OperandStack stack = frame.operandStack();int val = stack.popInt();int idx = stack.popInt();Object arrRef = stack.popRef();checkNotNull(arrRef);int[] ints = arrRef.ints();checkIndex(ints.length, idx);ints[idx] = val;}}

StringPool.java

package org.itstack.demo.jvm.rtda.heap.methodarea;import org.itstack.demo.jvm.rtda.heap.ClassLoader;import java.util.HashMap; import java.util.Map;/*** http://www.itstack.org* create by fuzhengwei on 2019/4/29*/ public class StringPool {private static Map<String, Object> internedStrs = new HashMap<>();public static Object jString(ClassLoader loader, String goStr) {Object internedStr = internedStrs.get(goStr);if (null != internedStr) return internedStr;char[] chars = goStr.toCharArray();Object jChars = new Object(loader.loadClass("[C"), chars);Object jStr = loader.loadClass("java/lang/String").newObject();jStr.setRefVal("value", "[C", jChars);internedStrs.put(goStr, jStr);return jStr;}public static String goString(Object jStr) {Object charArr = jStr.getRefVar("value", "[C");return new String(charArr.chars());}}

Interpret.java

package org.itstack.demo.jvm;import com.alibaba.fastjson.JSON; import org.itstack.demo.jvm.instructions.Factory; import org.itstack.demo.jvm.instructions.base.BytecodeReader; import org.itstack.demo.jvm.instructions.base.Instruction; import org.itstack.demo.jvm.rtda.Frame; import org.itstack.demo.jvm.rtda.Thread; import org.itstack.demo.jvm.rtda.heap.ClassLoader; import org.itstack.demo.jvm.rtda.heap.methodarea.*; import org.itstack.demo.jvm.rtda.heap.methodarea.Class; import org.itstack.demo.jvm.rtda.heap.methodarea.Object;//指令集解釋器 class Interpret {Interpret(Method method, boolean logInst, String args) {Thread thread = new Thread();Frame frame = thread.newFrame(method);thread.pushFrame(frame);if (null != args){Object jArgs = createArgsArray(method.clazz().loader(), args.split(" "));frame.localVars().setRef(0, jArgs);}loop(thread, logInst);}private Object createArgsArray(ClassLoader loader, String[] args) {Class stringClass = loader.loadClass("java/lang/String");Object argsArr = stringClass.arrayClass().newArray(args.length);Object[] jArgs = argsArr.refs();for (int i = 0; i < jArgs.length; i++) {jArgs[i] = StringPool.jString(loader, args[i]);}return argsArr;}private void loop(Thread thread, boolean logInst) {BytecodeReader reader = new BytecodeReader();while (true) {Frame frame = thread.currentFrame();int pc = frame.nextPC();thread.setPC(pc);reader.reset(frame.method().code, pc);byte opcode = reader.readByte();Instruction inst = Factory.newInstruction(opcode);if (null == inst) {System.out.println("Unsupported opcode " + byteToHexString(new byte[]{opcode}));break;}inst.fetchOperands(reader);frame.setNextPC(reader.pc());if (logInst) {logInstruction(frame, inst, opcode);}//execinst.execute(frame);if (thread.isStackEmpty()) {break;}}}private static void logInstruction(Frame frame, Instruction inst, byte opcode) {Method method = frame.method();String className = method.clazz().name();String methodName = method.name();String outStr = (className + "." + methodName + "() t") +"寄存器(指令)：" + byteToHexString(new byte[]{opcode}) + " -> " + inst.getClass().getSimpleName() + " => 局部變量表：" + JSON.toJSONString(frame.operandStack().getSlots()) + " 操作數(shù)棧：" + JSON.toJSONString(frame.operandStack().getSlots());System.out.println(outStr);}private static String byteToHexString(byte[] codes) {StringBuilder sb = new StringBuilder();sb.append("0x");for (byte b : codes) {int value = b & 0xFF;String strHex = Integer.toHexString(value);if (strHex.length() < 2) {strHex = "0" + strHex;}sb.append(strHex);}return sb.toString();}}

BubbleSortTest.java

package org.itstack.demo.test;/*** -Xjre "C:Program FilesJavajdk1.8.0_161jre" E:itstackgitistack-demoitstack-demo-jvmitstack-demo-jvm-08targettest-classesorgitstackdemotestBubbleSortTest -verbose true*/ public class BubbleSortTest {public static void main(String[] args) {int[] arr = {22, 84, 77, 11, 95, 9, 78, 56, 36, 97, 65, 36, 10, 24 ,92, 48};//printArray(arr);bubbleSort(arr);//System.out.println(123456789);printArray(arr);}private static void bubbleSort(int[] arr) {boolean swapped = true;int j = 0;int tmp;while (swapped) {swapped = false;j++;for (int i = 0; i < arr.length - j; i++) {if (arr[i] > arr[i + 1]) {tmp = arr[i];arr[i] = arr[i + 1];arr[i + 1] = tmp;swapped = true;}}}}private static void printArray(int[] arr) {for (int i : arr) {System.out.println(i);}}}

HelloWorld.java

package org.itstack.demo.test;/*** -Xjre "C:Program FilesJavajdk1.8.0_161jre" E:itstackgitistack-demoitstack-demo-jvmitstack-demo-jvm-08targettest-classesorgitstackdemotestHelloWorld -verbose true -args 你好，java版虛擬機(jī)v1.0，歡迎你的到來。*/ public class HelloWorld {public static void main(String[] args) {for (String str : args) {System.out.println(str);}}}

測試結(jié)果一；執(zhí)行數(shù)組

-Xjre "C:Program FilesJavajdk1.8.0_161jre" E:itstackgitistack-demoitstack-demo-jvmitstack-demo-jvm-08targettest-classesorgitstackdemotestBubbleSortTest -verbose true org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":0},{"num":0},{"num":0},{"num":0}] 操作數(shù)棧：[{"num":0},{"num":0},{"num":0},{"num":0}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0xbc -> NEW_ARRAY => 局部變量表：[{"num":16},{"num":0},{"num":0},{"num":0}] 操作數(shù)棧：[{"num":16},{"num":0},{"num":0},{"num":0}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":0},{"num":0},{"num":0}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":0},{"num":0},{"num":0}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x03 -> ICONST_0 => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":0}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":0}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":0}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":0}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":22}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":22}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":0},{"num":22}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":0},{"num":22}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x04 -> ICONST_1 => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":22}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":0},{"num":22}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":1},{"num":22}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":1},{"num":22}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":1},{"num":84}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":1},{"num":84}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":1},{"num":84}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":1},{"num":84}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x05 -> ICONST_2 => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":1},{"num":84}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":1},{"num":84}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":2},{"num":84}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":2},{"num":84}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":2},{"num":77}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":2},{"num":77}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":2},{"num":77}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":2},{"num":77}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x06 -> ICONST_3 => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":2},{"num":77}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":2},{"num":77}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":3},{"num":77}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":3},{"num":77}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":3},{"num":11}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":3},{"num":11}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":3},{"num":11}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":3},{"num":11}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x07 -> ICONST_4 => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":3},{"num":11}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":3},{"num":11}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":4},{"num":11}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":4},{"num":11}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":4},{"num":95}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":4},{"num":95}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":4},{"num":95}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":4},{"num":95}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x08 -> ICONST_5 => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":4},{"num":95}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":4},{"num":95}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":5},{"num":95}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":5},{"num":95}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":5},{"num":9}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":5},{"num":9}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":5},{"num":9}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":5},{"num":9}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":5},{"num":9}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":5},{"num":9}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":6},{"num":9}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":6},{"num":9}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":6},{"num":78}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":6},{"num":78}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":6},{"num":78}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":6},{"num":78}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":6},{"num":78}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":6},{"num":78}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":7},{"num":78}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":7},{"num":78}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":7},{"num":56}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":7},{"num":56}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":7},{"num":56}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":7},{"num":56}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":7},{"num":56}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":7},{"num":56}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":8},{"num":56}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":8},{"num":56}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":8},{"num":36}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":8},{"num":36}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":8},{"num":36}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":8},{"num":36}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":8},{"num":36}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":8},{"num":36}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":9},{"num":36}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":9},{"num":36}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":9},{"num":97}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":9},{"num":97}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":9},{"num":97}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":9},{"num":97}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":9},{"num":97}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":9},{"num":97}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":10},{"num":97}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":10},{"num":97}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":10},{"num":65}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":10},{"num":65}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":10},{"num":65}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":10},{"num":65}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":10},{"num":65}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":10},{"num":65}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":11},{"num":65}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":11},{"num":65}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":11},{"num":36}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":11},{"num":36}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":11},{"num":36}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":11},{"num":36}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":11},{"num":36}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":11},{"num":36}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":12},{"num":36}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":12},{"num":36}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":12},{"num":10}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":12},{"num":10}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":12},{"num":10}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":12},{"num":10}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":12},{"num":10}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":12},{"num":10}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":13},{"num":10}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":13},{"num":10}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":13},{"num":24}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":13},{"num":24}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":13},{"num":24}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":13},{"num":24}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":13},{"num":24}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":13},{"num":24}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":14},{"num":24}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":14},{"num":24}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":14},{"num":92}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":14},{"num":92}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x59 -> DUP => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":14},{"num":92}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":14},{"num":92}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":14},{"num":92}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":14},{"num":92}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x10 -> BIPUSH => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":15},{"num":92}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":15},{"num":92}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4f -> IASTORE => 局部變量表：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":15},{"num":48}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16,"ref":{"$ref":"$[0].ref"}},{"num":15},{"num":48}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x4c -> ASTORE_1 => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":15},{"num":48}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":15},{"num":48}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0x2b -> ALOAD_1 => 局部變量表：[{"num":16},{"num":16},{"num":15},{"num":48}] 操作數(shù)棧：[{"num":16},{"num":16},{"num":15},{"num":48}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0xb8 -> INVOKE_STATIC => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":15},{"num":48}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":15},{"num":48}] java/lang/Object.<clinit>() 寄存器(指令)：0xb8 -> INVOKE_STATIC => 局部變量表：null 操作數(shù)棧：null java/lang/Object.<clinit>() 寄存器(指令)：0xb1 -> RETURN => 局部變量表：null 操作數(shù)棧：null ... ... org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0xb2 -> GET_STATIC => 局部變量表：[{"num":9},{"num":0}] 操作數(shù)棧：[{"num":9},{"num":0}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0x15 -> ILOAD => 局部變量表：[{"num":9},{"num":0}] 操作數(shù)棧：[{"num":9},{"num":0}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0xb6 -> INVOKE_VIRTUAL => 局部變量表：[{"num":9},{"num":9}] 操作數(shù)棧：[{"num":9},{"num":9}] 9 org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0x84 -> IINC => 局部變量表：[{"num":9},{"num":9}] 操作數(shù)棧：[{"num":9},{"num":9}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0xa7 -> GOTO => 局部變量表：[{"num":9},{"num":9}] 操作數(shù)棧：[{"num":9},{"num":9}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0x1d -> ILOAD_3 => 局部變量表：[{"num":9},{"num":9}] 操作數(shù)棧：[{"num":9},{"num":9}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0x1c -> ILOAD_2 => 局部變量表：[{"num":1},{"num":9}] 操作數(shù)棧：[{"num":1},{"num":9}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0xa2 -> IF_ICMPGE => 局部變量表：[{"num":1},{"num":16}] 操作數(shù)棧：[{"num":1},{"num":16}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0x2b -> ALOAD_1 => 局部變量表：[{"num":1},{"num":16}] 操作數(shù)棧：[{"num":1},{"num":16}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0x1d -> ILOAD_3 => 局部變量表：[{"num":1,"ref":{}},{"num":16}] 操作數(shù)棧：[{"num":1,"ref":{}},{"num":16}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0x2e -> IALOAD => 局部變量表：[{"num":1,"ref":{}},{"num":1}] 操作數(shù)棧：[{"num":1,"ref":{}},{"num":1}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0x36 -> ISTORE => 局部變量表：[{"num":10},{"num":1}] 操作數(shù)棧：[{"num":10},{"num":1}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0xb2 -> GET_STATIC => 局部變量表：[{"num":10},{"num":1}] 操作數(shù)棧：[{"num":10},{"num":1}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0x15 -> ILOAD => 局部變量表：[{"num":10},{"num":1}] 操作數(shù)棧：[{"num":10},{"num":1}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0xb6 -> INVOKE_VIRTUAL => 局部變量表：[{"num":10},{"num":10}] 操作數(shù)棧：[{"num":10},{"num":10}] 10 11 22 24 36 36 48 56 65 77 78 84 92 95 97 org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0x84 -> IINC => 局部變量表：[{"num":97},{"num":97}] 操作數(shù)棧：[{"num":97},{"num":97}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0xa7 -> GOTO => 局部變量表：[{"num":97},{"num":97}] 操作數(shù)棧：[{"num":97},{"num":97}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0x1d -> ILOAD_3 => 局部變量表：[{"num":97},{"num":97}] 操作數(shù)棧：[{"num":97},{"num":97}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0x1c -> ILOAD_2 => 局部變量表：[{"num":16},{"num":97}] 操作數(shù)棧：[{"num":16},{"num":97}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0xa2 -> IF_ICMPGE => 局部變量表：[{"num":16},{"num":16}] 操作數(shù)棧：[{"num":16},{"num":16}] org/itstack/demo/test/BubbleSortTest.printArray() 寄存器(指令)：0xb1 -> RETURN => 局部變量表：[{"num":16},{"num":16}] 操作數(shù)棧：[{"num":16},{"num":16}] org/itstack/demo/test/BubbleSortTest.main() 寄存器(指令)：0xb1 -> RETURN => 局部變量表：[{"num":16,"ref":{}},{"num":16},{"num":15},{"num":48}] 操作數(shù)棧：[{"num":16,"ref":{}},{"num":16},{"num":15},{"num":48}]Process finished with exit code 0

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原作者：付政委
原文鏈接：用Java實(shí)現(xiàn)JVM第八章《數(shù)組和字符串》
原出處：付政委的博客

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