import java.util.*;class Person {private String name;private int age;Person(String name,int age){this.name=name;this.age=age;}public boolean equals(Object obj){if(!(obj instanceof Person))return false;Person p=(Person)obj;return this.name.equals(p.name) && this.age==p.age;}public String getName(){return name;}public int getAge(){return age;}}public class ArrayListTest2{public static void main(String args[]){ArrayList al=new ArrayList();al.add(new Person("zhangsan1",22));al.add(new Person("zhangsan2",33));al.add(new Person("zhangsan3",44));al.add(new Person("zhangsan5",88));al.add(new Person("zhangsan4",55));al.add(new Person("zhangsan1",22));//al.add(new Person("zhangsan3",44));al = singelElements(al);Iterator it1=al.iterator();while(it1.hasNext()){Person p=(Person)it1.next();sop(p.getName()+"..."+p.getAge());}/*Iterator it=al.iterator();while(it.hasNext()){Person p= (Person)it.next();//將其強制轉化為person類型 可以實現后邊的輸入否則不能調用getAge()和getName()方法sop(p.getName()+"..."+p.getAge());}*/}public static ArrayList singelElements(ArrayList al){ArrayList newal=new ArrayList();Iterator it=al.iterator();while(it.hasNext()){Object obj=it.next();if(!newal.contains(obj))newal.add(obj);}return newal;}public static void sop(Object obj){System.out.println(obj);}}