java基础（3）Java键盘输入，

java基础（3）Java键盘输入，

（1）导包：import Java.util.Scanner;

（2）Scanner scanner=new Scanner(System.in);

        int a=scanner.nextInt();

例子：

import java.util.Scanner;
class TestScanner{
public static void main(String [] args){
Scanner sc=new Scanner(System.in);
System.out.println("判断季节：请输入一个月份");
       int a=sc.nextInt();
switch(a){
case 3:
case 4:
case 5:
System.out.println("春天");
break;

case 6:
case 7:
case 8:
System.out.println("夏天");
break;

case 9:
case 10:
case 11:
System.out.println("秋天");
break;

case 12:
case 1:
case 2:
System.out.println("冬天");
break;

default :
System.out.println("你输入的数值有误");
break;

}
 }
}