JAVA_类_调用_方法

package MyPackage;

/**创建一个Student类，写出study、play、sleep、fight方法，并写一个BadStudent子类，利用extends和this调用父类的fight方法（可能不全面，自己看懂后试一试就好了）

*/

public class Student {
//声明成员变量name,id
String id="123";
String name="eve ";
//Student()构造器,若不定义，系统会默认构造一个无参构造器
public Student(){

}

public void study(String name){
//name = this.name;
/**
*若加入name = this.name 后输出
*  have fun
zzzzzzz
eve study hard

*/

//打印stack study hard
System.out.println(name+"study hard");

}

public void play(){
System.out.println("have fun");
}
public void sleep(){
System.out.println("zzzzzzz");
}
public void fight(){
System.out.println("no fight please~~~~~");
}
}


class BadStudent extends Student{
public void fight(){
System.out.println("come to fight!!!");
}

}

###################以下为测试类########################

package MyPackage;

public class Test {
public static void main(String[] args) {
//Student类
Student s = new Student();
//BadStudent类
BadStudent bs = new BadStudent();

s.study("stack ");
s.play();
s.sleep();
s.fight();//调用s的Fight方法，打印no fight please~~~~~
bs.fight();//调用bs的Fight方法，打印come to fight!!!
}
}