数组集合

打印名字，年龄，性别

package com;

public class Student {

     private int id;

     private String name;

     private String sex;

     

     public Student(int id, String name, String sex) {

          super();

          this.id = id;

          this.name = name;

          this.sex = sex;

     }

     public int getId() {

          return id;

     }

     public void setId(int id) {

          this.id = id;

     }

     public String getName() {

          return name;

     }

     public void setName(String name) {

          this.name = name;

     }

     public String getSex() {

          return sex;

     }

     public void setSex(String sex) {

          this.sex = sex;

     }

     @Override

     public String toString() {

          return "Student [id=" + id + ", name=" + name + ", sex=" + sex + "]";

     }

     

     

}

Student类

package com;

import java.util.ArrayList;

import java.util.List;

public class ListTest {

     public static void main(String[] args) {

          List<Student>list=new ArrayList<Student>();

          list.add(new Student(1, "亚托克斯", "男"));

          list.add(new Student(2, "亚索", "男"));

          list.add(new Student(3, "亚当", "男"));

          list.add(new Student(4, "亚洲人", "男"));

          list.add(new Student(5, "亚瑟", "男"));

//移除元素

          list.remove(4);

//替换元素

          list.set(0, new Student(5,"亚麻跌", "男"));     

          //遍历方式

          for (int i = 0; i < list.size(); i++) {

              //根据下标，返回指定下标的元素

              Student s=list.get(i);

              System.out.println(s.getId()+"  "+s.getName()+"  "+s.getSex());

              System.out.println(s);

              

          }

          

     }

}

第二种

System.out.println("======================================");

          //迭代器方式

          Iterator<Student> it=list.iterator();

          while(it.hasNext()){//判断是否右下一个元素

              //去除下一个元素

              Student s=it.next();

              System.out.println(s);

          }

第3种

System.out.println("======================================");

          //第3中foreach

          for (Student student : list) {

              System.out.println(student);

          }