import java.util.Scanner; //调用java.util.Scanner
public class Test
{
public static void main (String[] args)
{
Scanner keyboardInput = new Scanner(System.in); //从类Scanner中创建object keyboradInput
if (keyboardInput.hasNextInt() == true) //新创建的keyboardInput这个object下,调用hasNextInt() method来判断输入的是不是整数
System.out.println("输入的整数是: " + keyboardInput.nextInt()); //如果是整数,输出这个整数
else
System.out.println("输入的不是整数");
}
}