Java語言程式設計（基礎篇）第十版 4.16 4.17
阿新 • • 發佈：2018-12-14
public class J4_16 {
public static void main(String [] args) {
int ch= (int)(Math.random()*25)+65;
char ch1 = (char)ch;
System.out.println(ch1);
}
}
public class J4_17 { public static void main(String[] args) { // TODO Auto-generated method stub java.util.Scanner input = new java.util.Scanner(System.in); System.out.print("Enter a month: "); String month = input.nextLine(); System.out.print("Enter a year: "); int years = input.nextInt(); switch(month) { case "Jan":System.out.println(month+" "+ years +" has 31 dyas");break; case "Feb":{ if((years % 4 == 0 && years %100 != 0) || years % 400 == 0) System.out.println(month+" "+ years +" has 29 dyas"); else System.out.println(month+" "+ years +" has 28 dyas"); }break; case "Mar":System.out.println(month+" "+ years +" has 31 dyas");break; case "Apr":System.out.println(month+" "+ years +" has 30 dyas");break; case "May":System.out.println(month+" "+ years +" has 31 dyas");break; case "Jun":System.out.println(month+" "+ years +" has 30 dyas");break; case "Jul":System.out.println(month+" "+ years +" has 31 dyas");break; case "Aug":System.out.println(month+" "+ years +" has 31 dyas");break; case "Sep":System.out.println(month+" "+ years +" has 30 dyas");break; case "Oct":System.out.println(month+" "+ years +" has 31 dyas");break; case "Nov":System.out.println(month+" "+ years +" has 30 dyas");break; case "Dec":System.out.println(month+" "+ years +" has 31 dyas");break; } } }