java if和switch语句

if 语句：

public class ifguanjianzi {
    public static void main(String[] args) {
        if(2<1){
            System.out.println("1234567");
        }
        else {
            System.out.println("12");
        }
    }
}

switch 语句：

public class switchyuju {
    public static void main(String[] args) {
        switch (2+5){
            case 8:
                System.out.println("8");
                break;
            case 7:
                System.out.println("7");
                break;
            default:
                System.out.println("无匹配");
                break;

        }
    }
}