switchexample.java

java程序设计 清华出版社 孙燮华老师编写的程序源代码

//SwitchExample.java
import java.util.Random;

public class SwitchExample{
  public static void main(String[]args){
    Random random=new Random();   //声明随机数类对象并实例化
    float x  = random.nextFloat();//产生0.0到1.0的随机Float
    int month=Math.round(11*x+1); //产生1到12的随机Int
    switch(month){
      case 1: System.out.println("January"); break;
      case 2: System.out.println("February"); break;
      case 3: System.out.println("March"); break;
      case 4: System.out.println("April"); break;
      case 5: System.out.println("May"); break;
      case 6: System.out.println("June"); break;
      case 7: System.out.println("July"); break;
      case 8: System.out.println("August"); break;
      case 9: System.out.println("September"); break;
      case 10: System.out.println("October"); break;
      case 11: System.out.println("November"); break;
      case 12: System.out.println("December"); break;
    }
  }
}