博客

先建立一个学生类

package ysy09;

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

    public Student() {
    }

    public Student(String name, int age) {
        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;
    }
}

测试类

package ysy09;

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

public class ListDemo {
    public static void main(String[] args) {

        //创建List集合对象
        List<Student> c = new ArrayList<Student>();

        //创建学生对象
        Student s1 = new Student("小胖", 12);
        Student s2 = new Student("小爱", 13);
        Student s3 = new Student("小鱼", 15);

        //把学生添加到集合
        c.add(s1);
        c.add(s2);
        c.add(s3);

        //迭代器遍历:集合特有的遍历方式
        Iterator <Student> it = c.iterator();
        while (it.hasNext()) {
            Student s = it.next();
            System.out.println(s.getName()+","+s.getAge());
        }
        System.out.println("-------------");


        //普通for遍历：带有索引的遍历方式
        for (int i = 0; i < c.size(); i++) {
            Student s = c.get(i);
            System.out.println(s.getName()+","+s.getAge());
        }
        System.out.println("-------------");


        //增强for遍历：最方便的遍历方式
        for (Student s:c){
            System.out.println(s.getName()+","+s.getAge());
        }
    }
}