泛型测试

1、package cn.yq.java.fanxing;


public class User {
private String userName;
private String userPassword;
private int userAge;
private String userTele;

public User(String userName) {
super();
this.userName = userName;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
/*public int getUserAge() {
return userAge;
}*/
public void setUserAge(int userAge) {
this.userAge = userAge;
}
public String getUserTele() {
return userTele;
}
public void setUserTele(String userTele) {
this.userTele = userTele;
}
public String getUserPassword() {
return userPassword;
}
public void setUserPassword(String userPassword) {
this.userPassword = userPassword;
}
@Override
public String toString() {
return "User [userName=" + userName + ", userPassword=" + userPassword
+ ", userAge=" + userAge + ", userTele=" + userTele + "]";
}

}

2、package cn.yq.java.fanxing;
import java.util.*;
import java.util.Map.Entry;
import java.util.Set;


//自定义类，演示泛型方法的概念和作用
public class TestMap<Q> {
public static void main(String[] args) {
User user1= new User("wangmin");//创建用户对象
User user2= new User("wanghui");
HashMap<String,User> map = new HashMap<String,User>();//创建HashMap集合存放
map.put("str",user1);//存放用户信息
map.put("str1",user2);
map.put("str2",user2);
Set set =map.entrySet();//获得Set几何对象
Iterator<Entry<String,User>> it =set.iterator();//获得迭代器
//遍历迭代器
while (it.hasNext()){
System.out.println(it.next().getValue().getUserName());
}
}

}

3、package cn.yq.java.fanxing;


import java.util.ArrayList;
import java.util.List;


public class TestArrayList {
public static void main(String[] args) {
User user1= new User("峰");//创建用户对象
User user2= new User("根");
User user3= new User("me");
user1.setUserPassword("111111");
user2.setUserPassword("222222");
user3.setUserPassword("333333");
user1. setUserAge(18);
user2. setUserAge(17);
user3. setUserAge(88);
user1.setUserTele("看书");
user2.setUserTele("写字");
user3.setUserTele("锻炼");

ArrayList<User> aa=new ArrayList<User>();
aa.add(user1);
aa.add(user2);
aa.add(2,user3);
aa.add(new User("峰1"));
aa.addAll(1,aa);
System.out.println(aa);

System.out.println(aa.get(0));
System.out.println(aa.get(1));
System.out.println(aa.get(2));
System.out.println(aa.get(3));


//aa.clone();此行代码有错
System.out.println(aa);
//aa.clear();
int a =aa.size();
System.out.println(a);


aa.remove(0);
System.out.println(aa);

System.out.println(aa.get(0));
System.out.println(aa.get(1));
System.out.println(aa.get(2));
System.out.println("+++++++++++++++++++++");


System.out.println(aa.clone());
System.out.println("_____________________");
System.out.println(user1);

aa.addAll(1,aa);
System.out.println(aa);
//ArrayList的遍历
/*for(User userInfo:aa){
System.out.println(userInfo);
}*/
//user1.getUserAge();
}


}