ArrayList用法示例

（一） public class Student implements Comparable<Student>
{
 private int score1,score2,score3;
 private float pscore;
 private int id;
 private String name;
 public Student(int id,String name,int score1,int score2,int score3)
 {
  this.id=id;
  this.name=name;
  this.score1=score1;
  this.score2=score2;
  this.score3=score3;
  this.pscore=(this.score1+this.score2+this.score3)/3;
 }
 public String getName()
 {
  return this.name;
 }
 public int compareTo(Student stu)
 {
  if(this.pscore>stu.pscore)
   return 1;
  else return -1;
      
 }  
 public String toString()
    {
     String s="学号:"+this.id+";姓名:"+this.name+";平均成绩为:"+this.pscore+"\n";
     return s;
    }
}

（二）

public class Add
{
 private ArrayList<Student> array;
    //构造方法实例化array
 public Add()
 {
  array=new ArrayList<Student>();
 }
 //向array中添加Student的对象
    public void add(Student stu)
    {
     array.add(stu);
    }
    //从array中移除指定姓名的Student对象
    public void remove(String name)
    {
     Iterator<Student> iter = array.iterator();
     while(iter.hasNext())
     {
      if(iter.next().getName().equals(name))
      {
       iter.remove();
       System.out.println("正在删除...");
       try {
     Thread.sleep(1000);
    } catch (InterruptedException e) {
     e.printStackTrace();
    }
    System.out.println("删除成功!");
       break;
      }
      else
       {
         System.out.println("正在匹配下一个人...");
         try {
     Thread.sleep(1000);
    } catch (InterruptedException e) {
     e.printStackTrace();
    }
       }
     }
    }
    //把array中的数据转成Student的数组,用Arrays.sort()排序后输出(排序的前提是Student类中实现了Comparable<T>接口)
    public void showAll()
    {
     Student[] st=array.toArray(new Student[]{});
     Arrays.sort(st);
     for(Student stu:st)
     {
      System.out.println(stu);
     }
    }
}

（三）

package org.hwh.jiHe2;
public class Test
{
 private Student st1,st2,st3,st4;
   public static void main(String[] args)
   {
    Add ad=new Add();
    int[] id={1,2,3,4,5};
    String[] name={"张山","李四","王五","赵六","狗屎"};
    int[] score1={50,89,56,88,56};
    int[] score2={89,79,90,98,67};
    int[] score3={70,66,76,45,66};
    Student[] stu=new Student[5];
    for(int i=0;i<5;i++)
    {
     stu[i]=new Student(id[i],name[i],score1[i],score2[i],score3[i]);
     ad.add(stu[i]);
    }
    ad.remove("狗屎");
    try {
       Thread.sleep(1000);
        } catch (InterruptedException e)
        {
       e.printStackTrace();
        }
    System.out.println("正在排序输出....");
    try {
       Thread.sleep(1000);
        } catch (InterruptedException e)
        {
       e.printStackTrace();
        }
    ad.showAll();
   }
}