为什么执行只显示写试卷

package com.zw;

public class Test{

String name;

int socre;

public void play(){

System.out.println("写试卷");

}

}

package com.zw;

public class student extends Test{

}

package com.zw;

public class zxc {

 public static void main(String[] args) {

Test t=new Test();

t.name="zhangsan";

t.socre=90;

t.play();

}

}