[移动开发]初学java一周的控制台小程序：用户管理系统

使用数组，循环，排序，函数，做一个简单的用户管理系统

写在一个类中，耦合度高，具体功能包括：

增加一个用户

删除一个用户

修改一个用户信息

查询所有用户信息

用户工资排名

保存用户信息到指定目录（这里简化为本人电脑桌面）

退出

package com.guanli;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Scanner;

public class client {

	public static void main(String[] args) {
		//功能包括:添加用户，删除用户，修改用户，查询用户,工资排名，退出系统
		//用户信息包括，id，姓名，年龄，性别，工资，邮箱		
	
		firstIndex();//首页面
		int a=choiceIndex();//选择页面，并返回选择
		
		int[] id = new int[100];//编号
		String[] name = new String[100];//姓名
        String[] sex = new String[100];//性别
        int[] age = new int[100];//年龄
        float[] money = new float[100];//工资   
        String[] email = new String[100];//邮箱
        
        
        //给予初始值	
        id[0]=1;name[0]="轻微";sex[0]="男";age[0]=22;money[0]=1234.5f;email[0]="123456.com";
        id[1]=2;name[1]="大黄";sex[1]="男";age[1]=252;money[1]=1884.5f;email[1]="533456.com";
        id[2]=3;name[2]="沙发";sex[2]="女";age[2]=32;money[2]=3334.5f;email[2]="weewf3456.com";
        
        int[] count=new int[1];
        count[0]=3;//记录数量
           
        toIndex(a, id, name, sex, age, money, email, count);//选择去向

	}

	public static void addEmployee(int[] id,String[] name,String[] sex,int[] age,float[] money,String[] email,int[] count) {//增加用户
		System.out.println("增加用户");
		System.out.println("----------------------");
		Scanner scanner=new Scanner(System.in);

		System.out.println("输入用户id");
		int add = scanner.nextInt();
		id[count[0]]=add;
		
		System.out.println("输入用户姓名");
		String add1 = scanner.next();
		name[count[0]]=add1;
		
		System.out.println("输入用户性别");
		String add2 = scanner.next();
		sex[count[0]]=add2;
		
		System.out.println("输入用户年龄");
		int add3 = scanner.nextInt();
		age[count[0]]=add3;
		
		System.out.println("输入用户工资");
		Float add4 = scanner.nextFloat();
		money[count[0]]=add4;
		
		System.out.println("输入用户邮箱");
		String add5 = scanner.next();
		email[count[0]]=add5;
		
		System.out.println("输入用户信息成功");
		
		count[0]++;
		
		int a=choiceIndex();
		toIndex(a, id, name, sex, age, money, email, count);
	}
	public static void deleteEmployee(int[] id,String[] name,String[] sex,int[] age,float[] money,String[] email,int[] count) {//删除用户
		System.out.println("删除用户");		
		System.out.println("--------------------");
		System.out.println("请输入要删除的用户id");
		Scanner scanner = new Scanner(System.in);
        int id1 = scanner.nextInt();
        
        boolean test1=false;//查询是否有输入id
        for(int i=0;i<id.length-1;i++) {
        	if(id[i]==id1) {
        		test1=true;
        		break;
        	}
        }
        
        if(test1) {
        	int test=0;
        for(int i=0;i<id.length-1;i++) {
        	if(id[i]==id1) {
        		test=i;
        		break;
        	}
        }
        for(int i=test;i<id.length-1;i++) {//count长度
        	
        		//查到id，删除
        		id[i]=id[i+1];
        		name[i]=name[i+1];
        		sex[i]=sex[i+1];
        		age[i]=age[i+1];
        		money[i]=money[i+1];
        		email[i]=email[i+1];
        }
        System.out.println("删除id为"+id1+"的用户成功");
        count[0]--;
        }else {
        	System.out.println("未找到id为"+id1+"的用户");
        }
        

		int a=choiceIndex();
		toIndex(a, id, name, sex, age, money, email, count);
	}
	public static void coutOnDesk(int[] id,String[] name,String[] sex,int[] age,float[] money,String[] email,int[] count) {//删除用户
		System.out.println("输出所有用户信息到桌面");		
		System.out.println("--------------------");
		
		PrintStream p = System.out;
        try (PrintStream ps = new PrintStream(new FileOutputStream("C:\\Users\\11251\\Desktop\\12346.txt"))) {
            // 将标准输出重定向到ps输出流
            System.setOut(ps);
            // 不在控制台显示
            

    		System.out.printf("%-10s","id");
    		System.out.printf("%-10s","name");
    		System.out.printf("%-10s","sex"+" ");
    		System.out.printf("%-10s","age");
    		System.out.printf("%-10s","money");
    		System.out.printf("%-10s","email");
    		System.out.println(" ");
    		
    		for(int i=0;i<count[0];i++) {
    			//System.out.println(count[0]);
    			System.out.printf("%-10s",id[i]);
    			System.out.printf("%-10s",name[i]);
    			System.out.printf("%-10s",sex[i]);
    			System.out.printf("%-10s",age[i]);
    			System.out.printf("%-10s",money[i]);
    			System.out.printf("%-10s",email[i]);
    			
    			System.out.println(" ");
    		} 

            
            // 重定向回到控制台输出
            System.setOut(p);
            
            System.out.println("成功保存所有用户信息到桌面");    		    		
    		toIndex(choiceIndex(), id, name, sex, age, money, email, count);
    		
    		
        } catch (IOException e) {
            e.printStackTrace();
        }
		

	}
	public static void changeEmployee(int[] id,String[] name,String[] sex,int[] age,float[] money,String[] email,int[] count) {//修改用户信息
		System.out.println("修改用户信息");
		System.out.println("--------------------");
		System.out.println("请输入要修改的用户id");
		Scanner scanner = new Scanner(System.in);
        int id1 = scanner.nextInt();
        
        
        boolean test1=false;//查询是否有输入id
        for(int i=0;i<id.length-1;i++) {
        	if(id[i]==id1) {
        		test1=true;
        		break;
        	}
        }  
        if(test1) {
        	 for(int i=0;i<count[0];i++) {
        	if(id[i]==id1) {
        		id[i]=id[i];//编号不改
        		
        		Scanner scanner1=new Scanner(System.in);
        		
        		System.out.println("输入修改后的用户姓名");
        		String add1 = scanner1.next();
        		name[i]=add1;
        		
        		System.out.println("输入修改后的用户性别");
        		String add2 = scanner1.next();
        		sex[i]=add2;
        		
        		System.out.println("输入修改后的用户年龄");
        		int add3 = scanner1.nextInt();
        		age[i]=add3;
        		
        		System.out.println("输入修改后的用户工资");
        		Float add4 = scanner1.nextFloat();
        		money[i]=add4;
        		
        		System.out.println("输入修改后的用户邮箱");
        		String add5 = scanner1.next();
        		email[i]=add5;
        		
        		System.out.println("修改用户信息成功");

        	}
        }
		
        }else {
        	System.out.println("未找到id为"+id1+"的用户");
        }
        
           		
		
		int a=choiceIndex();
		toIndex(a, id, name, sex, age, money, email, count);
	}
	public static void findEmployee(int[] id,String[] name,String[] sex,int[] age,float[] money,String[] email,int[] count) {//查询用户信息
		System.out.println("查询用户信息");
		System.out.printf("%-10s","id");
		System.out.printf("%-10s","name");
		System.out.printf("%-10s","sex"+" ");
		System.out.printf("%-10s","age");
		System.out.printf("%-10s","money");
		System.out.printf("%-10s","email");
		System.out.println(" ");
		
		for(int i=0;i<count[0];i++) {
			//System.out.println(count[0]);
			System.out.printf("%-10s",id[i]);
			System.out.printf("%-10s",name[i]);
			System.out.printf("%-10s",sex[i]);
			System.out.printf("%-10s",age[i]);
			System.out.printf("%-10s",money[i]);
			System.out.printf("%-10s",email[i]);
			
			System.out.println(" ");
		}
		
		int a=choiceIndex();
		toIndex(a, id, name, sex, age, money, email, count);
	}
	public static void moneySort(int[] id,String[] name,String[] sex,int[] age,float[] money,String[] email,int[] count) {//工资排名
		System.out.println("工资排名结果如下");
		
		if(count[0] > 0){
			for(int i = 0;i<count[0];i++){
				for(int j = 0;j<count[0] - 1 - i;j++){
					if(money[j] < money[j+1]){//比较工资,排序
						
						int temp = id[j];
						id[j] = id[j+1];
						id[j+1] = temp;
						
						String temp1 = name[j];
						name[j] = name[j+1];
						name[j+1] = temp1;
						
						String temp2 = sex[j];
						sex[j] = sex[j+1];
						sex[j+1] = temp2;
						
						int temp3 = age[j];
						age[j] = age[j+1];
						age[j+1] = temp3;
						
						Float temp4 = money[j];
						money[j] = money[j+1];
						money[j+1] = temp4;
						
						String temp5 = email[j];
						email[j] = email[j+1];
						email[j+1] = temp5;														
					}
				}
			}
		}
		
		
		System.out.printf("%-8s","排名");
		System.out.printf("%-10s","id");
		System.out.printf("%-12s","name");
		System.out.printf("%-10s","sex"+" ");
		System.out.printf("%-10s","age");
		System.out.printf("%-10s","money");
		System.out.printf("%-10s","email");
		System.out.println(" ");
		
		int num=1;
		for(int i=0;i<count[0];i++) {
			//System.out.println(count[0]);
			System.out.printf("%-10s",num++);
			System.out.printf("%-10s",id[i]);
			System.out.printf("%-10s",name[i]);
			System.out.printf("%-10s",sex[i]);
			System.out.printf("%-10s",age[i]);
			System.out.printf("%-10s",money[i]);
			System.out.printf("%-10s",email[i]);
			
			System.out.println(" ");
		}

		
		
		
		int a=choiceIndex();
		toIndex(a, id, name, sex, age, money, email, count);
	}
	public static void endSystem() {//退出系统
		System.out.println("      ");
		System.out.println("退出系统,欢迎下次使用");
	}
	
	
	public static void firstIndex() {//首页面
		System.out.println("*************************************");
        System.out.println("*******吴泉玮的  员工管理系统******");
        System.out.println("*************************************");
		System.out.println("                           ");	
	}
	
	public static int choiceIndex() {//选择页面
		System.out.println(" ");
		System.out.println(" ");		
		System.out.println("请选择您要进行的操作：");
		System.out.println("1.添加员工     2.删除员工    3.修改员工");
	    System.out.println("4.查询所有员工 5.工资排名    6.退出系统");
	    System.out.println("7.保存所有员工信息到桌面");
	    Scanner scanner=new Scanner(System.in);
        int choice = scanner.nextInt();
	    return choice;
	}
	
	public static void toIndex(int a,int[] id,String[] name,String[] sex,int[] age,float[] money,String[] email,int[] count) {//选择判断去向页面
		if(a==1) {
			addEmployee(id, name, sex, age, money, email, count);
			 
		}else if(a==2) {
			deleteEmployee(id, name, sex, age, money, email, count);
			
		}else if(a==3) {
			changeEmployee(id, name, sex, age, money, email, count);
			
		}else if(a==4) {
			findEmployee(id, name, sex, age, money, email, count);
			
		}else if(a==5) {
			moneySort(id, name, sex, age, money, email, count);
			
		}else if(a==6) {
			endSystem();
			
		}else if(a==7) {
			coutOnDesk(id, name, sex, age, money, email, count);
			
		}else {
			System.out.println("无效选择，请重新选择");
			choiceIndex();
		}
		
		System.out.println("                           ");	
	}
}