Question

我使用的是NetBeans IDE 7.4，我对Java很新，我试图让用户输入两个数字（两个都是双数），然后将它们存储在另一个变量中。我去了DOZENS的教程网站，他们并不好。如何获得基本输入和输出？

Answer 1

原始示例：

import java.util.Scanner;

public class TestIO {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println("Print something:");    // printing output
        String text = scanner.nextLine();          // taking input

        System.out.println("You have printed the following text: " + text);
    }

}

的更新：
对不起，错过了一点，你想要双打。你走了：

import java.util.Scanner; import java.util.InputMismatchException; public class TestIO { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); double firstDouble = 0L; double secondDouble = 0L; while (true) { // take input (two doubles) until successful System.out.println("Print two doubles (press enter after each input):"); try { firstDouble = scanner.nextDouble(); secondDouble = scanner.nextDouble(); } catch (InputMismatchException e) { System.out.println("Wrong input. You must print doubles.\n" + "Depending on your locale, as a decimal separator " + "use either a comma or a dot.\n"); scanner.nextLine(); // clearing the buffer with the wrong input // to avoid infinite loop continue; } break; } // Printing the user input (limiting doubles to 3 decimal places) System.out.format("You have printed %.3f and %.3f %n", firstDouble, secondDouble); } }

推荐阅读：

官方Oracle Java Tutorials - 信息量大且易于理解

课程：Basic I/O（来自上述教程）

Answer 2

import java.util.*;

public class Test
{
static Scanner console = new Scanner (System.in)
public static void main (String[] args)
{
double input1, input2; // Declares the double value of input1 and input2
input1 = console.nextDouble(); // User inputs value into input1
input2 = console.nextDouble();

String value1 = "" + input1; // Storing value into a String
String value2 = "" + input2;
// If you want to store it in let's say string.
// Or else i think / int value1 = Integer.parseInt(input1);
// This changes the double value into an Int value
// Something like that.
}
}

不太确定这是否是您的问题，因为输出值也可以使用

System.out.println(input1); // This outputs the value of input1 on the screen.

Java中的基本输入和输出

2 个答案: