數(shù)據(jù)基本類型：

整型：字節(jié)型byte 短整型short ?整型int? 浮點類型：長整形long ?浮點型 ?fioat ? 雙精度性double? 字符型：char? 布爾型：boolean 引用類型（ reference）： 類class ? 接口interface ? 數(shù)據(jù) ?array 循環(huán)：for ? while ? ? ?do while ? ? switch (case ? default ? ) package?huigu20161128; public?class?ArrayTest1?{ public?static?void?main(String?[]args){ int?sum=0; int?arr[]={11,22,33,44,55}; for(int?i=0;i<arr.length;i++){ sum=sum+arr[i]; } System.out.println("arr總和為"+sum);? ? ? ? String[]?arr1=new?String[5];?//必須指定大小 for(int?i=0;i<arr1.length;i++){ System.out.println(arr1[i]); }? int?[][]?arr={ {1,2,3,45}, {1,3,4}, {6,53,3} }; int?sum=0; for(int?i=0;i<arr.length;i++){ for(int?j=0;j<arr[i].length;j++){ sum=sum+arr[i][j];???????? } }? ? ? ? System.out.println("sum="+sum); String?s="";//定義一個空字符串 String?[][]?str=new?String?[2][]; String?st[]={"strty","tr1","str2"}; String?st1[]={"sr","sb","cc"}; str[0]=st; str[1]=st1; for(int?i=0;i<str.length;i++){ for(int?j=0;j<str[i].length;j++){ if(str[i][j].contains("s")?&&?str[i][j].length()<3){} s=s+str[i][j]; } } System.out.println("s="+s); } } package?huigu20161128; public?class?Ifdemo2?{ //數(shù)據(jù)基本類型：整型：?byte?short?int??long //字符：char????布爾類型??boolean:true?false??浮點型:double?float //引用類型：String?? //????int?c;//成員變量?初始值?：0 //????String?str;//初始值??null //?? public?static?void?main(String?[]args){ //????????int?a=11;//局部變量 //????????int?b=9; //????????//if?單分支 //????????if(a>b){ //????????????System.out.println("a>b"); //????????}???? //if?雙分支 //????????if(a>b){ //?????????System.out.println("a>b"); //???????}else{ //???????????System.out.println("a<=b"); //???????} //if?多分支 //????????int?score=70;//分數(shù) //????????if(score<=100?&&?score>=90){ //????????????System.out.println("優(yōu)秀"); //????????}else?if(score>80?&&?score<90){ //????????????System.out.println("良好"); //????????}else?if(score<=80?&&?score>=60){ //????????????System.out.println("及格"); //????????}else{ //????????????System.out.println("不及格"); //????????} //for?循環(huán) //????????for(int?i=0;i<100;i++){ //????????????//1.定義一個變量?i=0??2.判斷i??3.運行程序體??4.i++??5.判斷 //????????????System.out.println(i); //????????} //????????for(int?i=0;i<10;i++){//雙層for循環(huán)?外層控制行??內(nèi)層控制列 //????????????for(int?j=0;j<10;j++){ //????????????System.out.print("*");???? //??????????} //????????????System.out.println(); //????????} //while循環(huán) //????????int?a=1; //????????while(a<10){ //????????????System.out.println("還滿足循環(huán)體"); //????????????//a--;//a=a-1; //????????????a++;//a=a+1; //????????????if(a==6){ //??????????????break; //????????????} //????????} //????????int?a=9; //????????//do?while //????????do{ //????????????System.out.println("至少執(zhí)行一次"); //???????}while(a>10); //switch?case int?a=4; switch?(a)?{ case?1: System.out.println("1"); break; case?2: System.out.println("2"); break; case?3: System.out.println("3"); break; default: System.out.println("一個條件不滿足"); break; } } } package?huigu20161128; public?class?MethodTest3?{ public?void?TestMax(){ System.out.println("我是一個方法"); } public?boolean?TestM(int?a,int?b){ if(a>=b){ return?true; }else{ return?false; } } public?static?void?main(String?[]args){ MethodTest3?mt=new?MethodTest3(); //??????mt.TestMax(); int?a=10; int?b=13; if(mt.TestM(a,?b)){ System.out.println("a>=b");? }else{ System.out.println("a<b"); } } } package?huigu20161128; import?java.util.Scanner; public?class?SumScore5?{ //????int?a=10; //????int?b=11; //????System.out.println(a+b+"a="+(a+b)); public?static?void?main(String?[]args){ Scanner?scan=new?Scanner(System.in); int?score;//定義變量 double?sum?=?0; for(int?i=0;i<5;i++){ System.out.println("請輸入一個整數(shù)的分數(shù)："); score=scan.nextInt();//接受鍵盤輸入 sum=sum+score; } System.out.println("你的總分數(shù)是"+sum);???? System.out.println("你的平均分是"+(sum/5)); ? ??? } }

轉載于:https://www.cnblogs.com/AngelKing1111/p/6110966.html

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