课后练习4: package a2; import java.util.Scanner; public class C4 { public static void main(String[] args) { Scanner input = new Scanner(System.in); String o; do { System.out.println("请输入长度为6的字符串:"); o = input.nextLine(); }while(o.length() != 6); System.out.println("程序退出,你输入了:"+o); } } 课后练习5: package a2; import java.util.Scanner; import org.omg.Messaging.SyncScopeHelper; public class C5 { public static void main(String[] args) { Scanner input = new Scanner(System.in); boolean flag = false; System.out.print("请输入会员生日<月/日:00/00>:"); String birth = input.next(); while(!flag) { if(Integer.parseInt(birth.substring(0,birth.indexOf('/')))>=1 && Integer.parseInt(birth.substring(0,birth.indexOf('/')))<=12 && Integer.parseInt(birth.substring(birth.indexOf('/')+1,birth.length()))>=1 && Integer.parseInt(birth.substring(birth.indexOf('/')+1,birth.length()))<=31) { System.out.println("该会员的生日是:"+birth); flag = true; }else { System.out.println("请输入会员生日<月/日:00/00>:"); birth = input.next(); flag = false; } } flag = false; do { System.out.println("请输入会员密码<6~10位>:"); String password = input.next(); if((password.length()>=6 && password.length()<=10)) { System.out.println("该会员的密码是:"+password); flag = true; }else { System.out.println("密码输入形式错误!"); } }while(!flag); } } 课后练习6: package a2; import java.util.Random; import java.util.Scanner; public class C6 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("请输入会员姓名:"); String name = input.next(); System.out.println("请输入会员性别:"); String sex = input.next(); System.out.println("请输入会员年龄:"); int age = input.nextInt(); System.out.println("创建会员成功:"); System.out.print("会员编号:"); for (int i = 0; i < 4; i++) { Random num = new Random(); int n = num.nextInt(10); System.out.print(n); } System.out.println("会员详细信息:"); System.out.println(name+"\t"+sex+"\t"+age); } }
高级特性 第2章
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