java实现电话本管理系统

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 + "]"; 
}