java - 开关内部打印

Question

期望的结果是打印“i 是零”，然后是一、二、三、四..

看起来我的 for 循环工作正常，每次执行时 i 都会达到 5，但我的情况都不是真的，所以没有打印任何内容。我做错了什么？

public class SwitchTest {

    public static void main(String[] args) {
        int i;

        for ( i=0; i < 5; i++); {

        switch (i) {
            case 0:
                System.out.println("i is zero");
            case 1:
                System.out.println("i is one");
            case 2:
                System.out.println("i is two");
            case 3:
                System.out.println("i is three");
            case 4:
                System.out.println("i is four");
            }
        }
    }
}

Answer 1

您需要在每个 Sysout like 之后添加 break 语句。

switch (i) {
           case 0:
                System.out.println("i is zero");
                break;
            case 1:
                System.out.println("i is one");
                break;
            case 2:
                System.out.println("i is two");
                break;
            case 3:
                System.out.println("i is three");
                break;
            case 4:
                System.out.println("i is four");
                break;
            default:
               //some statement here.

     }