java实现电话本管理系统

用java实现一个简单的电话本管理系统，能存储100个人的姓名、性别、年龄、电话等信息，并能对此系统进行增删改查的操作。

部分代码如下:

public class phbook { 
public static void main(string[] args) { 
       person personarray[] = new person[100]; 
       int index = 0; 
       for (int i = 0; i < 100; i++) { 
          system.out.println("电话本管理系统"); 
          system.out.println("1.添加   2.删除   3.修改   4.查询所有   5.根据姓名查询   0.退出"); 
          system.out.println("请选择业务"); 
          scanner input = new scanner(system.in); 
          int a = input.nextint(); 
     switch (a) { 
    case 0: { 
      system.out.println("退出系统"); 
      i = 101; 
    } 
      ; 
      break; 
    case 1: { 
      system.out.println("添加电话本"); 
      system.out.print("姓名："); 
      scanner n = new scanner(system.in); 
      string name = n.next(); 
      system.out.print("性别："); 
      scanner s = new scanner(system.in); 
      string sex = s.next(); 
      system.out.print("年龄："); 
      scanner ag = new scanner(system.in); 
      string age = ag.next(); 
      system.out.print("电话："); 
      scanner tel = new scanner(system.in); 
      string telnum = tel.next(); 
      system.out.print("qq："); 
      scanner q = new scanner(system.in); 
      string qq = q.next(); 
      system.out.print("地址："); 
      scanner add = new scanner(system.in); 
      string address = add.next(); 
      personarray[index] = new person(name, sex, age, telnum, qq, 
          address); 
      index = index + 1; 
    } 
      ; 
      break; 
    case 2: { 
      system.out.println("删除电话本"); 
      system.out.println("需要删除的姓名："); 
      scanner name0 = new scanner(system.in); 
      string namedel = name0.next(); 
      for (int j = 0; j < index; j++) { 
        if (namedel.equals(personarray[j].name) == true) { 
          for (int n = j; n < index - 1; n++) { 
            personarray[n] = personarray[n + 1]; 
          } 
          index = index - 1; 
          break; 
        } 
        if (j == index - 1) { 
          system.out.println("查无此人"); 
        } 
      } 
    } 
      ; 
      break; 
    case 3: { 
      system.out.println("修改电话本"); 
      system.out.println("需要修改的姓名："); 
      scanner name00 = new scanner(system.in); 
      string nameedit = name00.next(); 
      for (int k = 0; k < index; k++) { 
        if (nameedit.equals(personarray[k].name) == true) { 
          system.out.print("姓名："); 
          scanner xm1 = new scanner(system.in); 
          string name1 = xm1.next(); 
          system.out.print("性别："); 
          scanner xb1 = new scanner(system.in); 
          string sex1 = xb1.next(); 
          system.out.print("年龄："); 
          scanner nl1 = new scanner(system.in); 
          string age1 = nl1.next(); 
          system.out.print("电话："); 
          scanner dh1 = new scanner(system.in); 
          string telnum1 = dh1.next(); 
          system.out.print("qq："); 
          scanner q1 = new scanner(system.in); 
          string qq1 = q1.next(); 
          system.out.print("地址："); 
          scanner dz1 = new scanner(system.in); 
          string address1 = dz1.next(); 
          personarray[k] = new person(name1, sex1, age1, telnum1, 
              qq1, address1); 
          break; 
        } 
        if (k == index - 1) { 
          system.out.println("查无此人"); 
        } 
      } 
    } 
      ; 
      break; 
    case 4: { 
      system.out.println("显示所有电话本"); 
      for (int l = 0; l < index; l++) { 
        system.out.println(personarray[l].tostring()); 
      } 
    } 
      ; 
      break; 
    case 5: { 
      system.out.println("查询电话本"); 
      system.out.println("需要查询的姓名："); 
      scanner na = new scanner(system.in); 
      string nameprint = na.next(); 
      for (int m = 0; m < index; m++) { 
        if (nameprint.equals(personarray[m].name) == true) { 
          system.out.println(personarray[m].tostring()); 
          break; 
        } 
        if (m == index - 1) { 
          system.out.println("查无此人"); 
        } 
      } 
    } 
      ; 
      break; 
    default: { 
      system.out.println("无此功能"); 
    } 
      ; 
      break; 
    } 
  } 
public person(string name, string sex, string age, string telnum, 
    string qq, string address) { 
  this.name = name; 
  this.sex = sex; 
  this.age = age; 
  this.telnum = telnum; 
  this.qq = qq; 
  this.address = address; 
 
} 
 
public string tostring() { 
  return " [姓名=" + name + ", 性别=" + sex + ", 年龄=" + age + ", 电话=" 
      + telnum + ",qq=" + qq + ", 地址=" + address + "]"; 
} 

下面是程序运行的结果：

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