1、 if(username.equals(“zxx”){} 2、 int x = 1; return x==1?true:false;
2、下面程序输出的结果?
import java.util.Date; public class Test extends Date{ public static void main(String[] args) { new Test().test(); } public void test(){ System.out.println(super.getClass().getName()); } }
3、下面的代码有错?
interface Playable { void play(); } interface Bounceable { void play(); } interface Rollable extends Playable, Bounceable { Ball ball = new Ball("PingPang"); } class Ball implements Rollable { private String name; public String getName() { return name; } public Ball(String name) { this.name = name; } public void play() { ball = new Ball("Football"); System.out.println(ball.getName()); } }