集合框架-泛型-泛型类

package cn.itcast.p4.generic.definedemo;

import cn.itcast.p2.bean.Student;
import cn.itcast.p2.bean.Worker;

public class GenericDefineDemo3 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Tool<Student> tool = new Tool<Student>();
        
        tool.setObject(new Student());
//        tool.setObject(new Worker());//编译时就发现类型不同
        Student stu = (Student)tool.getObject();
//        Tool tool = new Tool();        
//        tool.setObject(new Worker());        
//        Student stu = (Student)tool.getObject();
    }

}

package cn.itcast.p4.generic.definedemo;

import cn.itcast.p2.bean.Object;
//定义一个工具类操作所有对象
/*
 * public class Tool { private Object object;
 * 
 * public Object getObject() { return object; }
 * 
 * public void setObject(Object object) { this.object = object; }
 * 
 * }
 */
//在jdk1.5后，使用泛型来接收类中要操作的引用数据类型。
//泛型类。什么时候用？当类中的操作的引用数据类型不确定的时候，就使用泛型来表示。
public class Tool<QQ>{
    private QQ q;

    public QQ getObject() {
        return q;
    }

    public void setObject(QQ object) {
        this.q = object;
    }
    
}

package cn.itcast.p2.bean;

import java.util.Comparator;

public class Person implements Comparable<Person>{
    private String name;
    private int age;
    
    
    public Person() {
        super();
        // TODO Auto-generated constructor stub
    }
    
    public Person(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }
    public int compareTo(Person p) {//指定比较类型，传入比较类型
//        Person p= (Person)obj;
        int temp = this.age-p.age;
        return temp==0?this.name.compareTo(p.name):temp;
    }
    
    
//    @Override
//    public boolean equals(Object obj) {//不能把Object改为Person，equals方法来自Object，Object没有定义泛型
//        // TODO Auto-generated method stub
//        if (this == obj) {
//            return true;
//        }
//        if (!(obj instanceof Person)) {
//            throw new RuntimeException()
//        }
//        Person p = (Person)obj;
//        return super.equals(obj);
//    }
    /*
     * @Override public int hashCode() { final int prime = 31; int result = 1;
     * result = prime * result + age; result = prime * result + ((name == null) ? 0
     * : name.hashCode()); return result; }
     * 
     * @Override public boolean equals(Object obj) { if (this == obj) return true;
     * if (obj == null) return false; if (getClass() != obj.getClass()) return
     * false; Person other = (Person) obj; if (age != other.age) return false; if
     * (name == null) { if (other.name != null) return false; } else if
     * (!name.equals(other.name)) return false; return true; }//alt+shift+s
     * hashCode和equals
     */
    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;
    }
    
}

package cn.itcast.p2.bean;

public class Student extends Person {

    public Student() {
        super();
        // TODO Auto-generated constructor stub
    }

    public Student(String name, int age) {
        super(name, age);
        // TODO Auto-generated constructor stub
    }
    
}

package cn.itcast.p2.bean;

public class Worker extends Person {

    public Worker() {
        super();
        // TODO Auto-generated constructor stub
    }

    public Worker(String name, int age) {
        super(name, age);
        // TODO Auto-generated constructor stub
    }
    
}