switch_case

Posted 2021-03-08 hapyygril

package myproject;

public class Switch_Case {
    public static void main(String[] args) {
        double d=Math.random();
        int e=(int)(d*5);
        System.out.println(e);
        
        /*
         
        switch(e) {
        case 6:
            System.out.println("best"); //遇到break才终止运行；一般在每个case后面都要加break；以防穿透
            break;
        case 5:
            System.out.println("better");
            break;
        case 4:
            System.out.println("good");
            break;
        default:
            System.out.println("bad");                  
            
        }
        */
        /*
        
        //利用穿透
        switch(e) {
        case 0:
        case 2:
        case 4:
            System.out.println("偶数");
            break;
        case 1:
        case 3:
        case 5:
            System.out.println("奇数");
            break;
        default:
            System.out.println("奇数");                  
            
        }
        */
        
        String a="java";
        switch(a){   //可以是字符串
        case "java":
            System.out.println("java");   
            break;
        case "python":
            System.out.println("python");   
            break;
        default:
            System.out.println("linux");  
            
            
            
            
        }
        
        
    }
}