java 电话本

//本人以前学的是php,基本上是写一个类,解决问题, 写的仓促, 不足之处请指出.

package test1;

import java.util.*;

public class tel {

String name;

String age;

String sex;

String addr;

int dindex ;

//定义一个二维数组,用来储存用户

String[][] ytel =new String[55][4];

int len =0 ;

String[] y = {"姓名","年龄","性别","地址"};

Scanner sc = new Scanner(System.in);

public void choise(){

System.out.println(" =========== 电话本管理系统 ==========\n"

+ "1:添加 2:删除 3:修改 4:查询出所有 5:根据姓名查询 0:退出 \n"

+ " =========== 电话本管理系统 ==========\n"+ "请选择业务");

byte one = sc.nextByte();

switch (one) {

case 0: //退出

this.quit();

break;

case 1 : //添加

System.out.println("======添加电话本=======");

System.out.println(this.Add(name, age, sex, addr));

break;

case 2: //删除

System.out.print("请输入要删除的用户");

String dname = sc.next();

System.out.println(this.find(dname));

if(this.find(dname).equals("无此用户")){

break;

}

System.out.println("你确定要删除吗?1(是), 0(否)");

byte flag = sc.nextByte();

this.del(dindex);

break;

case 3: //更新

System.out.println("请输入更新的用户");

String n = sc.next();

System.out.println(this.find(n));

if(this.find(n).equals("无此用户")){

break;

}

this.upd();

break;

case 4: //查所有

System.out.println(this.selall());

break;

case 5: //查一个

System.out.println("====== 查询用户 ======\n 请输入要查询的姓名");

String fname = sc.next();

System.out.println(this.find(fname));

default:

break;

}

}

public String upd(){

String uall = "";

for(int w=0;w<4;w++){

System.out.println(this.y[w]);

String upd = sc.next();

this.ytel[this.dindex][w]=y[w]+":"+upd;

uall+=y[w]+" :"+upd;

}

return uall+"\n修改成功";

}

public String find(String findname){

String jilu = "";

String flag = "nofind";

if(this.len ==0){

return "请先输入用户";

}

for( int a =0;a<(this.len);a++){

//System.out.print();

if((ytel[a][0]).equals("姓名:"+findname)){

//此处说明查找到了

for(int b=0;b<4;b++){

jilu += this.ytel[a][b];

this.dindex = a;

flag="find";

}

}

}

if(flag.equals("nofind")){

return "无此用户";

}

return jilu;

}

public String del(int id){

for(int w=0;w<4;w++){

this.ytel[id][w]= "";

}

return "删除成功";

}

//退出系统

public void quit(){

return;

}

//添加用户

public String Add(String name,String age,String sex,String addr){

String aall = "";

for(int w=0;w<4;w++){

System.out.print(y[w]+" "); //打印请输入 姓名,年龄,...

String tian = sc.next(); //给用户输入

this.ytel[this.len][w] = y[w] + ":"+ tian; //添加到二位数组中

aall+=y[w]+":"+tian+" \t";

}

(this.len)+=1;

return aall+"\n添加成功" ;

}

public String selall(){

//System.out.println("sssssss");

String all = "";

System.out.println("====== 打印所有的电话本 ======");

for( int a =0;a<this.len;a++){

for(int b=0;b<4;b++){

all+=this.ytel[a][b]+"\n";

}

all+="\n";

}

return all;

}

}

package telclass;

import java.awt.Choice;

public class rtel {

public static void main(String[] args) {

// TODO Auto-generated method stub

tel mytel = new tel();

while(true){

mytel.choise();

}

}

}