java中如何從鍵盤中輸入數值

 

 

 

import java.util.Scanner; //調用java.util.Scanner

public class Test
{
    public static void main (String[] args)
    {
        Scanner keyboardInput = new Scanner(System.in); //從類Scanner中創建object keyboradInput

        if (keyboardInput.hasNextInt() == true) //新創建的keyboardInput這個object下，調用hasNextInt() method來判斷輸入的是不是整數
            System.out.println("輸入的整數是: " + keyboardInput.nextInt()); //如果是整數，輸出這個整數
        else
            System.out.println("輸入的不是整數");
    }
}