java - Java:要求用户输入2个数字，然后打印总和错误

当我尝试运行此命令时，出现错误提示

Exception in thread "main" java.lang.NullPointerException
at lsamelson_lab5.LSamelson_Lab5.main(LSamelson_Lab5.java:21)
Java Result: 1

第21行是要求第一个用户输入的行。

我正在运行Ubuntu，是因为我没有正确导入控制台，还是我的java文件出了问题？

package lsamelson_lab5;

import java.io.Console;

/**
*
* @author binka
*/
public class LSamelson_Lab5 {

    /**
    * @param args the command line arguments
    */
    public static void main(String[] args) {
        // TODO code application logic here\
        Console console = System.console();
        String input = console.readLine("Please enter your first number:");
        int newinput = Integer.parseInt(input);
        String input2 = console.readLine("Please enter your second number: ");
        int newinput2 = Integer.parseInt(input2);
        int sum = newinput + newinput2;
        int diff = newinput - newinput2;
        int mult = newinput * newinput2;
        float div = newinput / newinput2;
        System.out.print(sum);
        System.out.print(diff);
        System.out.print(mult);
        System.out.print(div);
    }
}

最佳答案

使用

System.out.print("Please enter your first number:")

代替

String input = console.readLine("Please enter your first number:");

Console::readLine()不是您需要的
用读行

Scanner in = new Scanner(System.in);

编辑

Scanner in = new Scanner(System.in);
System.out.println("Please enter your first number:");
int newinput = in.nextInt();
System.out.println("Please enter your second number: ");
int newinput2 = in.nextInt();