源碼使用try-catch代碼包裝下，如下：

public class CompileForbid {public static void main(String[] args) {try {System.out.println("-------");//防止反編譯的處理if (654789 == new Random().nextInt()) {throw new Exception("fewt43");}} catch (Exception ex) {ex.printStackTrace();} finally {try {//防止反編譯的處理if (654789 == new Random().nextInt()) {throw new Exception("fewt43");}} catch (Exception ex) {System.out.print(ex);}}} }

使用 jd 反編譯工具翻遍后的效果，別的反編譯可能會反編譯出來，效果不是很好，但是簡單實用

public class CompileForbid {// ERROR //public static void main(java.lang.String[] args){// Byte code:// 0: getstatic 16 java/lang/System:out Ljava/io/PrintStream;// 3: ldc 22// 5: invokevirtual 24 java/io/PrintStream:println (Ljava/lang/String;)V// 8: ldc 30// 10: new 31 java/util/Random// 13: dup// 14: invokespecial 33 java/util/Random:<init> ()V// 17: invokevirtual 34 java/util/Random:nextInt ()I// 20: if_icmpne +90 -> 110// 23: new 38 java/lang/Exception// 26: dup// 27: ldc 40// 29: invokespecial 42 java/lang/Exception:<init> (Ljava/lang/String;)V// 32: athrow// 33: astore_1// 34: aload_1// 35: invokevirtual 44 java/lang/Exception:printStackTrace ()V// 38: ldc 30// 40: new 31 java/util/Random// 43: dup// 44: invokespecial 33 java/util/Random:<init> ()V// 47: invokevirtual 34 java/util/Random:nextInt ()I// 50: if_icmpne +93 -> 143// 53: new 38 java/lang/Exception// 56: dup// 57: ldc 40// 59: invokespecial 42 java/lang/Exception:<init> (Ljava/lang/String;)V// 62: athrow// 63: astore_3// 64: getstatic 16 java/lang/System:out Ljava/io/PrintStream;// 67: aload_3// 68: invokevirtual 47 java/io/PrintStream:print (Ljava/lang/Object;)V// 71: goto +72 -> 143// 74: astore_2// 75: ldc 30// 77: new 31 java/util/Random// 80: dup// 81: invokespecial 33 java/util/Random:<init> ()V// 84: invokevirtual 34 java/util/Random:nextInt ()I// 87: if_icmpne +21 -> 108// 90: new 38 java/lang/Exception// 93: dup// 94: ldc 40// 96: invokespecial 42 java/lang/Exception:<init> (Ljava/lang/String;)V// 99: athrow// 100: astore_3// 101: getstatic 16 java/lang/System:out Ljava/io/PrintStream;// 104: aload_3// 105: invokevirtual 47 java/io/PrintStream:print (Ljava/lang/Object;)V// 108: aload_2// 109: athrow// 110: ldc 30// 112: new 31 java/util/Random// 115: dup// 116: invokespecial 33 java/util/Random:<init> ()V// 119: invokevirtual 34 java/util/Random:nextInt ()I// 122: if_icmpne +21 -> 143// 125: new 38 java/lang/Exception// 128: dup// 129: ldc 40// 131: invokespecial 42 java/lang/Exception:<init> (Ljava/lang/String;)V// 134: athrow// 135: astore_3// 136: getstatic 16 java/lang/System:out Ljava/io/PrintStream;// 139: aload_3// 140: invokevirtual 47 java/io/PrintStream:print (Ljava/lang/Object;)V// 143: return//// Exception table:// from to target type// 0 33 33 java/lang/Exception// 38 63 63 java/lang/Exception// 0 38 74 finally// 75 100 100 java/lang/Exception// 110 135 135 java/lang/Exception} }

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