在Java中，我们如何从标准输入读取数据？

标准输入(stdin)在Java中可以用System.in来表示。 System.in 是InputStream 类的一个实例。这意味着它的所有方法都适用于字节，而不是字符串。要从键盘读取任何数据，我们可以使用 Reader 类或 Scanner 类。

示例1

import java.io.*;
public class ReadDataFromInput {
   public static void main (String[] args) {
      int firstNum, secondNum, result;
<strong>      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
</strong>      try {
         System.out.println("Enter a first number:");
         firstNum = Integer.parseInt(br.readLine());
         System.out.println("Enter a second number:");
         secondNum = Integer.parseInt(br.readLine());
         result = firstNum * secondNum;
         System.out.println("The Result is: " + result);
      } catch (IOException ioe) {
         System.out.println(ioe);
      }
   }
}

输出

Enter a first number:
15
Enter a second number:
20
The Result is: 300

示例2

import java.util.*;
public class ReadDataFromScanner {
   public static void main (String[] args) {
      int firstNum, secondNum, result;
<strong>      Scanner scanner = new Scanner(System.in);
</strong>      System.out.println("Enter a first number:");
      firstNum = Integer.parseInt(scanner.nextLine());
      System.out.println("Enter a second number:");
      secondNum = Integer.parseInt(scanner.nextLine());
      result = firstNum * secondNum;
      System.out.println("The Result is: " + result);
   }
}

输出

Enter a first number:
20
Enter a second number:
25
The Result is: 500

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