众所周知，冒泡排序法在一般数组中就3步，
1 if(a<b){
2 temp=a;
3 a=b;
4 b=temp;
5 }
然而，在集合中就不是简单的交换一下了，因为交换之后，必须保证新的值被重新设置到集合中去。那么变难了吗？实际上更简单了：
1 if(a<b){
2 workerlist.get(j).setSc(b);
3 workerlist.get(j+1).setSc(a);
4 }
原理还是交换，不过不需要媒介temple 了。
具体代码见下：
*********************工人类**********************
1 package com.xtkj.worker;
2 public class Worker{
3 int id;
4 String name;
5 int age;
6 double salary;
7
8 public Worker(){} //构造方法
9 public Worker(int id,String name, int age,double salary ) {
10 this.id = id;
11 this.name = name;
12 this.age = age;
13 this.salary = salary;
14 }
15 public String getName() {
16 return name;
17 }
18 public void setName(String name) {
19 this.name = name;
20 }
21 public int getId() {
22 return id;
23 }
24 public void setId(int id) {
25 this.id = id;
26 }
27 public double getSc() {
28 return salary;
29 }
30 public void setSc(double salary) {
31 this.salary = salary;
32 }
33 public int getAge() {
34 return age;
35 }
36 public void setAge(int age) {
37 this.age = age;
38 }
39
40 public Worker getNext(){
41 return this.getNext();
42 }
43
44 }
*******************方法类（这里只讲解冒泡排序）***************
1 package com.xtkj.worker;
2 import java.util.ArrayList;
3 import java.util.List;
4 import java.util.Scanner;
5 public class Method {
6 public static List<Worker> workerlist = new ArrayList<Worker>();
7 //按薪水由高到低排序
8 double temp;
9 double a=0;
10 double b=0;
11 void sort(){
12 System.out.println("按员工薪水从高到低排序结果为：");
13 for(int i=0;i<workerlist.size()-1;i++){
14 for(int j=0;j<workerlist.size()-1-i;j++){
15 a=workerlist.get(j).getSc();
16 b=workerlist.get(j+1).getSc();
17 if(a<b){
18 // temp=a;
19 workerlist.get(j).setSc(b); //注意：这里是把值设置到集合中去
20 // a=b;
21 workerlist.get(j+1).setSc(a); //简单的 a与b 交换，改变的只是从集合中取出来的结果，集合里面的元素并没有改变
22 // b=temp;
23 }
24 }
25 }
26 }
*****************界面类（测试类）**********************
package com.xtkj.worker;
import java.util.Scanner;
public class Main {
/**
* @param args
*/
public static void main(String[] args) {
Method method = new Method();
boolean b = true;
while(b){
System.out.println();
System.out.println("*********************欢迎进入职员薪水管理系统***********************");
System.out.println("请选择以下操作：");
System.out.println("1.添加新员工");
System.out.println("2.查询员工信息");
System.out.println("3.显示所有员工信息");
System.out.println("4.修改员工薪水");
System.out.println("5.删除员工信息");
System.out.println("6.薪水由低到高排列");
System.out.println("7.统计员工平均工资和最低、最高工资");
System.out.println("8.退出本系统");
Scanner reader=new Scanner(System.in );
System.out.println("请输入功能:");
int ab = reader.nextInt();
switch(ab)
{
case 1:
method.add();
break;
case 2:
method.find();
break;
case 3:
method.showAll();
break;
case 4:
method.updatesal();
break;
case 5:
method.delete();
case 6:
method.sort();
break;
case 7:
method.statics();
break;
case 8:
System.out.println("已退出职员薪水管理系统！");
b = false;
}
}
Worker wr=new Worker();
}
}
运行结果如下：
