集合，ArrayList练习

 import java.util.ArrayList;
 import java.util.Iterator;

 public class ArrayListTest {
     public static void main(String[] args) {
         ArrayList<Person> list = new ArrayList<Person>();
           list.add(new Person("wangcai", 21));
           list.add(new Person("zhangsan", 22));
           list.add(new Person("lisi", 23));
           list.add(new Person("zhaoliu", 24));
           list.add(new Person("wangcai", 21));
           list.add(new Person("lisi", 23));
           System.out.println(list);
           list=getNewList(list);
           System.out.println(list);
           singleStringDemo();
     }

     public static void singleStringDemo(){
           ArrayList list=new ArrayList();
           list.add("java01");
           list.add("java02");
           list.add("java05");
           list.add("java02");
           list.add("java04");
           list.add("java05");
           list.add("java04");
           System.out.println(list);
           list=getNewList(list);
           System.out.println(list);
     }

     public static ArrayList getNewList(ArrayList list) {
         ArrayList temp = new ArrayList();
         Iterator it = list.iterator();
         while(it.hasNext()) {
             Object obj = it.next();
             if (!temp.contains(obj)) {
                 temp.add(obj);
             }
         }
         return temp;
     }
 }

 public class Person {
     private String name;
     private int age;

     public Person() {
         super();
     }

     public Person(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 "Person [name=" + name + ", age=" + age + "]";
     }

 }