# Java 程序：相加兩個二進制數 > 原文： [https://beginnersbook.com/2018/09/java-program-to-add-two-binary-numbers/](https://beginnersbook.com/2018/09/java-program-to-add-two-binary-numbers/) 在本教程中，我們將 [java 程序](https://beginnersbook.com/2017/09/java-examples/)編寫為[相加兩個二進制數](https://beginnersbook.com/2018/03/python-program-to-add-two-binary-numbers/)。二進制數系統只有兩個符號 0 和 1 所以二進制數只包含 0 和 1。在我們編寫相加程序之前，讓我們看看我們如何在紙上相加，如下圖所示：  ## 示例：在 Java 中相加二進制數 在這個程序中，我們使用[`Scanner`](https://beginnersbook.com/2014/07/java-program-to-get-input-from-user/)從用戶獲取輸入（用戶輸入我們需要相加的兩個二進制數），然后我們使用[`while`循環](https://beginnersbook.com/2015/03/while-loop-in-java-with-examples/)逐位相加它們，并將結果存儲在一個數組中。 ```java import java.util.Scanner; public class JavaExample { public static void main(String[] args) { //Two variables to hold two input binary numbers long b1, b2; int i = 0, carry = 0; //This is to hold the output binary number int[] sum = new int[10]; //To read the input binary numbers entered by user Scanner scanner = new Scanner(System.in); //getting first binary number from user System.out.print("Enter first binary number: "); b1 = scanner.nextLong(); //getting second binary number from user System.out.print("Enter second binary number: "); b2 = scanner.nextLong(); //closing scanner after use to avoid memory leak scanner.close(); while (b1 != 0 || b2 != 0) { sum[i++] = (int)((b1 % 10 + b2 % 10 + carry) % 2); carry = (int)((b1 % 10 + b2 % 10 + carry) / 2); b1 = b1 / 10; b2 = b2 / 10; } if (carry != 0) { sum[i++] = carry; } --i; System.out.print("輸出： "); while (i >= 0) { System.out.print(sum[i--]); } System.out.print("\n"); } } ``` 輸出： ```java Enter first binary number: 11100 Enter second binary number: 10101 輸出： 110001 ``` Eclipse IDE 中的相同程序：  Eclipse 中程序的輸出：  以下是一些相關的 java 示例： 1. [Java 程序：相加兩個復數](https://beginnersbook.com/2018/09/java-program-to-add-two-complex-numbers/) 2. [Java 程序：相加兩個數字](https://beginnersbook.com/2017/09/java-program-to-add-two-numbers/) 3. [Java 程序：相加數十進制數字](https://beginnersbook.com/2018/06/python-program-add-digits-number/)