课堂复习内容(3)

     switch 标签使用:

     示例: 

                import java.util.Scanner;

                      public class Test09 {
                       public static void main(String[] args) {
                          Scanner input = new Scanner(System.in);
                           System.out.println("今天星期几(1-7):");
                                int day = input.nextInt();
                                    switch (day) {
                                  case 1:
                                System.out.println( "周一");
                                   break;
                                   case 2:
                          System.out.println("周二");
                                       break;
                                        case 3:
                                System.out.println("周三");
                                        break;
                                             case 4:
                                System.out.println("周四");
                                       break;
                                                case 5:
                                    System.out.println("周五");
                                     break;
                           case 6:
                                   System.out.println("周六");
                                         break;
                                             case 7:
                                      System.out.println("周末");
                                break;

                                 default:

                                            System.out.println("请输入正确的数字:");

                               break;        
                                }
       }                                                                                                     }
}

 继(复习2):   随机数: int random=(int)(Math.random()*10);

              &&   与.并且    两边条件都得满足

              ||      或者       两边条件满足一个就行