Java中的基本输入和输出

我使用的是NetBeans IDE 7.4，我对Java非常陌生，我试图让用户输入两个数字（都是双精度的），然后将它们存储在另一个变量中。我去过几十个辅导网站，但都不好。如何获得基本的输入和输出

基本示例：

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);
    }

}

更新：
对不起，没有抓住要点，你想打双打。给你：

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);
    }
}

---

建议阅读：

• 官方-它的信息量很大，很容易理解
• 课程：（来自上述教程）

基本示例：

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);
    }

}

更新：
对不起，没有抓住要点，你想打双打。给你：

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);
    }
}

---

建议阅读：

• 官方-它的信息量很大，很容易理解
• 课程：（来自上述教程）

不太确定这是否是您的问题，因为输出值也可能与

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

不太确定这是否是您的问题，因为输出值也可能与

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

---

double d1=double.parseDouble（文本）@是的，有很多变化。我刚刚抛出了一些基本示例）double d1=double.parseDouble（文本）@是的，有很多变化。我只是举了一些基本的例子