分支语句

分支语句：

格式：switch

{

Case 整数值1:语句;break;

Case 整数值2:语句;break;

Case 整数值3:语句;break;

Case 整数值4:语句;break;

……

default:语句;

}

 

通过程序体会一下：

/**分支语句功能测试*/ import java.io.*;public class SwitchTest{ public static void main(String[] args) { String strIn = ""; InputStreamReader in = new InputStreamReader(System.in); BufferedReader buffIn = new BufferedReader(in); System.out.print("Please enter a month(1-12): "); try { strIn = buffIn.readLine(); //从命令行读入数据 } catch (IOException e) { System.out.println(e.toString()); } int month = Integer.parseInt(strIn); //将字符串转变成整数型 int season = 0; if(month < 12 && month > 0) season = ((month + 10) % 12)/3 + 1; //计算季节的公式 switch(season) { case 1: System.out.println("the season is Spring!"); break; case 2: System.out.println("the season is Summer!"); break; case 3: System.out.println("the season is Fall!"); break; case 4: System.out.println("the season is Winter!"); break; default: System.out.println("this is not correct month!"); } }}

 

运行结果：

 

i = 0
j = 0
continue inner
j = 1
j = 2
continue inner
i = 1
j = 0
continue inner
j = 1
continu outer
i = 2
j = 0
continue inner
j = 1
j = 2
continue inner
i = 3
j = 0
continue inner
j = 1
continu outer
i = 4
j = 0
continue inner
j = 1
j = 2
continue inner
this is all over!