数组排序，请高手给个结果

[wjjwt]

按类中的某个属性对类数组排序，尽量用JDK的类实现

[jacky花园]

数组中装的是对象
而不是类!!

[believefym]

google一下Comparator，找个例子，应该不难

[andy2u]

这个应该不难啊，都会有讲到的

[keeya0416]

package com.keeya.Test;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class Test {
	public static void main(String[] args) {
		List<Employee> employees = new ArrayList<Employee>();

		employees.add(new Employee("Andy", 21, 2000));
		employees.add(new Employee("Felix", 21, 3000));
		employees.add(new Employee("Bill", 35, 20000));
		employees.add(new Employee("Helen", 21, 10000));
		employees.add(new Employee("Cindy", 28, 8000));
		employees.add(new Employee("Douglas", 25, 5000));

		// 按名称排序
		Collections.sort(employees, new NameComparator());
		display(employees);

		// 按年龄排序
		Collections.sort(employees, new AgeComparator());
		display(employees);

		// 按薪水排序
		Collections.sort(employees, new SalaryComparator());
		display(employees);
	}

	public static void display(List<Employee> employees) {
		for (Employee e : employees) {
			System.out.println("雇员名=" + e.getName() + " 年龄=" + e.age + " 薪水="
					+ e.getSalary());
		}
		System.out.println();
	}
}

class Employee {
	protected String name;

	protected int age;

	protected int salary;

	public Employee(String name, int age, int salary) {
		this.name = name;
		this.age = age;
		this.salary = salary;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getSalary() {
		return salary;
	}

	public void setSalary(int salary) {
		this.salary = salary;
	}
}

class AgeComparator implements Comparator {
	public int compare(Object op1, Object op2) {
		Employee eOp1 = (Employee) op1;
		Employee eOp2 = (Employee) op2;

		// 按年龄排序
		return eOp1.getAge() - (eOp2.getAge());
	}
}

class NameComparator implements Comparator {
	public int compare(Object op1, Object op2) {
		Employee eOp1 = (Employee) op1;
		Employee eOp2 = (Employee) op2;

		// 按姓名排序
		return eOp1.getName().compareTo(eOp2.getName());
	}
}

class SalaryComparator implements Comparator {
	public int compare(Object op1, Object op2) {
		Employee eOp1 = (Employee) op1;
		Employee eOp2 = (Employee) op2;

		// 按薪水排序
		return eOp1.getSalary() - (eOp2.getSalary());
	}
}

测试结果：
雇员名=Andy 年龄=21 薪水=2000
雇员名=Bill 年龄=35 薪水=20000
雇员名=Cindy 年龄=28 薪水=8000
雇员名=Douglas 年龄=25 薪水=5000
雇员名=Felix 年龄=21 薪水=3000
雇员名=Helen 年龄=21 薪水=10000

雇员名=Andy 年龄=21 薪水=2000
雇员名=Felix 年龄=21 薪水=3000
雇员名=Helen 年龄=21 薪水=10000
雇员名=Douglas 年龄=25 薪水=5000
雇员名=Cindy 年龄=28 薪水=8000
雇员名=Bill 年龄=35 薪水=20000

雇员名=Andy 年龄=21 薪水=2000
雇员名=Felix 年龄=21 薪水=3000
雇员名=Douglas 年龄=25 薪水=5000
雇员名=Cindy 年龄=28 薪水=8000
雇员名=Helen 年龄=21 薪水=10000
雇员名=Bill 年龄=35 薪水=20000

[欢乐极客]

[Quote=引用 4 楼 keeya0416 的回复:]
Java code

package com.keeya.Test;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class Test {
public static void ……
[/Quote]


可以参考参考

[Lynn_20043745]

如4楼所写，实现Comparator接口得到不同的比较器。不过他用的是集合，如果楼主想要数组的话，也一样，只是排序是调用Arrays类的sort方法，其他的基本一样

[水中影子]

4楼，写的很详细

也可以使用TreeSet排序