class Student{
    
    private String name;
    private int age;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    /**
     * @param name
     * @param age
     */
    public Student(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }
    
    public Student() {
        // TODO Auto-generated constructor stub
    }
    
    public void show() {
        System.out.println("Student [name=" + name + ", age=" + age + "]");
    }
}

class Undergraduate extends Student{
    
    private String degree;

    public String getDegree() {
        return degree;
    }

    public void setDegree(String degree) {
        this.degree = degree;
    }

    /**
     * @param name
     * @param age
     * @param degree
     */
    public Undergraduate(String name, int age, String degree) {
        super(name, age);
        this.degree = degree;
    }

    @Override
    public void show() {
        System.out.println("Undergraduate [ degree=" + degree + "]");
    }
}

public class TestStudent3 {

    public static void main(String[] args) {
        Student student1 = new Student("张三", 12);
        Student student2 = new Student("李四", 13);
        student1.show();
        student2.show();
        Undergraduate undergraduate = new Undergraduate("王五", 20, "硕士");
        undergraduate.show();
    }
}