package LinkedList; import java.util.ArrayList; import java.util.Iterator; import p.bean.Person; public class ArrayListDemo { public static void main(String[] args) { // TODO Auto-generated method stub ArrayList a1=new ArrayList(); a1.add(new Person("李四1",21)); a1.add(new Person("李四2",22)); a1.add(new Person("李四3",23)); a1.add(new Person("李四4",24)); Iterator it=a1.iterator(); while(it.hasNext()) { //System.out.println(((Person) it.next()).getName()+"::"+((Person) it.next()).getAge());//一条语句不可用两个next() 会取出 1 name 2 age 3 name 4 age Person p=(Person) it.next();//自定义对象别忘了取出 的时候做强转 System.out.println(p.getAge()+"::"+p.getName()); } a1.add(5);//a1.add(new Integer(5); } }
package p.bean; public class 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 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; } public static void main(String[] args) { // TODO Auto-generated method stub } }