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 + "]"; }