ArrayList

package com.hanqi;

import java.util.ArrayList;

public class TestList {

    public static void main(String[] args) {
        
        int[] a;
        
        //ArrayList 可变数组
        
        ArrayList<String> array = new ArrayList<String>();
        
        array.add("abc");//放数据
        array.add("def");
        
        for(int i=0;i<10;i++){
            
            //array.add(i+"");
            
            array.add(new Integer(i).toString());
        }
        
        System.out.println("集合的长度 = "+array.size());
        
        System.out.println(array.get(1));
        
        System.out.println(" ");
        
        for(String t:array){
            System.out.println("t = "+t);
        }
        
      
        
        ArrayList<User> a1User = new ArrayList<User>();
        
        a1User.add(new User("小明",10));//匿名对象
        
        User aUser = new User("小李",20);
        
        a1User.add(aUser);
        
        for(int i=0;i<a1User.size();i++){
            User u = a1User.get(i);
            
            System.out.println(""+u);
        }

    }

}

package com.hanqi;

public class User {
    
    private String name;
    
    private int age;
    
    public User(String name, int age) {
        super();
        this.name = name;
        this.age = 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;
    }
    @Override
    public String toString() {
        return "User [name=" + name + ", age=" + age + "]";
    }
    
    
    

}