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: