java - readInt 和 readLine 在 Java 中制作基本的加法机

Question

这个问题已经有答案了:

Java User Input and Difference between readInt and nextInt? (2 个回答)

已关闭 4 年前。

我正在尝试制作一个简单的加法机。

public class AddingMachine {   // Save as 'AddingMachine.java"
   public static void main(String[] args) {  
    System.out.println();
    System.out.println("Welcome to the Adding Machine.");
    System.out.println();

    String name = readLine("What is your name? ");
    int num1 = readInt("What is the first number? ");
    int num2 = readInt("What is the second number? ");
    System.out.println();

    int sum = num1 + num2;
    System.out.print(name);
    System.out.print(", the sum is: ");
    System.out.print(sum);
    }
}

错误消息报告“找不到符号”readInt或readString但我在Oracle网站上找到了方法:

https://docs.oracle.com/javase/7/docs/api/java/io/DataInputStream.html

可能还有其他一些方法可以解决这个问题，但我认为read方法构成了一个非常简单的输入/输出示例。

Answer 1

这就是解决方案

readInt 和 readLine 是 Scanner 类的方法。

public class AddingMachine {   // Save as 'AddingMachine.java"
   public static void main(String[] args) { 
        System.out.println();
        System.out.println("Welcome to the Adding Machine.");
        System.out.println();

        System.out.println("What is the first number?");
        Scanner sc = new Scanner(System.in);
        int num1 = sc.nextInt();
        System.out.println("What is the second number?");
        int num2 = sc.nextInt();
        System.out.println();

        int sum = num1 + num2;
        System.out.print(sum);
        System.out.print(", the sum is: ");
        System.out.print(sum);
  }
}