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                # Java 程序:乘以兩個數字 > 原文: [https://beginnersbook.com/2017/09/java-program-to-multiply-two-numbers/](https://beginnersbook.com/2017/09/java-program-to-multiply-two-numbers/) 當您開始學習 [java 編程](https://beginnersbook.com/java-tutorial-for-beginners-with-examples/)時,您在作業中遇到了這些類型的問題。這里我們將看到兩個 Java 程序,第一個程序接受兩個整數(由用戶輸入)并顯示這些數字的乘積。第二個程序采用任意兩個數字(可以是整數或浮點數)并顯示結果。 ## 示例 1:讀取兩個整數并打印它們的產品 該程序要求用戶輸入兩個整數并顯示產品。要了解如何使用掃描儀獲取用戶輸入,請檢查此程序:[程序從系統輸入](https://beginnersbook.com/2017/09/java-program-to-read-integer-value-from-the-standard-input/)讀取整數。 ```java import java.util.Scanner; public class Demo { public static void main(String[] args) { /* This reads the input provided by user * using keyboard */ Scanner scan = new Scanner(System.in); System.out.print("Enter first number: "); // This method reads the number provided using keyboard int num1 = scan.nextInt(); System.out.print("Enter second number: "); int num2 = scan.nextInt(); // Closing Scanner after the use scan.close(); // Calculating product of two numbers int product = num1*num2; // Displaying the multiplication result System.out.println("輸出: "+product); } } ``` **輸出:** ```java Enter first number: 15 Enter second number: 6 輸出: 90 ``` ## 示例 2:讀取兩個整數或浮點數并顯示乘法 在上面的程序中,我們只能整數。如果我們想計算兩個浮點數的乘積怎么辦?此程序允許您輸入浮點數并計算產品。 這里我們使用[數據類型](https://beginnersbook.com/2017/08/data-types-in-java/) double 作為數字,這樣你就可以輸入整數和浮點數。 ```java import java.util.Scanner; public class Demo { public static void main(String[] args) { /* This reads the input provided by user * using keyboard */ Scanner scan = new Scanner(System.in); System.out.print("Enter first number: "); // This method reads the number provided using keyboard double num1 = scan.nextDouble(); System.out.print("Enter second number: "); double num2 = scan.nextDouble(); // Closing Scanner after the use scan.close(); // Calculating product of two numbers double product = num1*num2; // Displaying the multiplication result System.out.println("輸出: "+product); } } ``` **輸出:** ```java Enter first number: 1.5 Enter second number: 2.5 輸出: 3.75 ```
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