Java if、for、while循环结构 九九乘法表 |
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JAVA 的三大结构
if 结构
案例1 package com.kuangsheng.Day3; import java.util.Scanner; public class Demo05 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.println("请输出内容"); String s = scanner.nextLine(); if(s.equals("Hello")){ System.out.println(s); } System.out.println("End"); Scanner close; } }案例2 package com.kuangsheng.Day3; import java.util.Scanner; public class Demo06 { public static void main(String[] args) { Scanner scanner = new Scanner (System.in); System.out.println("请输入成绩："); int score = scanner.nextInt(); if (score>60){ System.out.println("及格"); } else { System.out.println("不及格"); } scanner.close(); } }Switch 语句 案例1 package com.kuangsheng.Day4; public class SwitchDemo1 { public static void main(String[] args) { char grade = 'B'; switch(grade){ case 'A': System.out.println("优秀"); break; case 'B': System.out.println("良好"); break; default: System.out.println("未知等级"); } } }案例2 package com.kuangsheng.Day4; public class SwitchDemo2 { public static void main(String[] args) { String name = "拽少爷"; switch (name){ case "舒寒": System.out.println("舒寒"); break; case "拽少爷" : System.out.println("拽少爷"); break; default: System.out.println("输不起"); } } }for 循环 案例1：打印100以内的数 package com.kuangsheng.Day4; public class ForDemo1 { public static void main(String[] args) { int i = 1; while(i |
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