java编程，谢谢！！！！

来源：百度知道 编辑：UC知道 时间：2024/06/23 00:20:20
3、编写Person类，含有私有变量 String name、 int age；方法speak()；编写Student类继承Person类，有私有变量 int grade、 String zhuanye；方法speak()；实现类的继承及方法的覆盖

public class Person
{
private String name;
private int age;
public void speak()
{
System.out.println("I am "+name);
}
}

class Student extends Person
{
private int grade;
private String zhuanye;
public void speak()
{
System.out.println("I am a student.");
}
}

public class Parent
{

public String name;

private int age;

public String speak() {
return "hello world";

} }

public class Studentextends Parent{
private int grade;

private String zhuanye;

public String speak() {

return "" + zhuanye;
}

}