ArrayList排序

最新推荐文章于 2022-08-24 15:11:10 发布

薛大琪

最新推荐文章于 2022-08-24 15:11:10 发布

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分类专栏： Java 文章标签： string import list class html border

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今天写一个小东西，要用到排序，好久不用了，都忘记了。。。。

话不多说，直接上代码

Student.java

public class Student {
	private String id;
	private String name;
	private String sex;
	private int source;

	public Student(String id, String name, String sex, int source) {
		super();
		this.id = id;
		this.name = name;
		this.sex = sex;
		this.source = source;
	}

	public String getId() {
		return id;
	}

	public String getName() {
		return name;
	}

	public String getSex() {
		return sex;
	}

	public int getSource() {
		return source;
	}

	@Override
	public String toString() {
		// TODO Auto-generated method stub
		return this.getSource()+"";
	}
}

重要的部分

MyComparator .java

import java.util.Comparator;

public class MyComparator implements Comparator<Student> {

	public int compare(Student s1, Student s2) {
		if(s1.getSource() > s2.getSource()){
			return 1;
		} else if(s1.getSource() < s2.getSource()) {
			return -1;
		}
		return 0;
	}

}

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@page import="com.bean.Student"%>
<%@page import="com.bean.MyComparator"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
		<title>TestJSP</title>
	</head>

	<body>
		<%
			Student s1 = new Student("001", "Jim", "男", 50);
			Student s2 = new Student("002", "Tom", "男", 70);
			Student s3 = new Student("003", "Dave", "男", 65);
			Student s4 = new Student("004", "Peter", "男", 80);
			Student s5 = new Student("005", "Lucy", "女", 100);
			//创建集合
			ArrayList<Student> list = new ArrayList<Student>();
			list.add(s1);
			list.add(s2);
			list.add(s3);
			list.add(s4);
			list.add(s5);
			Comparator comparator = new MyComparator();//重要部分
			Collections.sort(list, comparator);
		%>
		<table border="1">
			<tr>
				<td>
					ID
				</td>
				<td>
					姓名
				</td>
				<td>
					性别
				</td>
				<td>
					成绩
				</td>
			</tr>
			<%
				for (Student s : list) {
			%>
			<tr>
				<td><%=s.getId() %></td>
				<td><input type="text" value="<%=s.getName() %>"/></td>
				<td><input type="radio" checked="checked"/><%=s.getSex() %></inp></td>
				<td><%=s.getSource() %></td>
			</tr>
			<%
				}
			%>
		</table>
	</body>
</html>