# Java 程序：相加两个二进制数 > 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，我们将 [java 程序](https://beginnersbook.com/2017/09/java-examples/)编写为[相加两个二进制数](https://beginnersbook.com/2018/03/python-program-to-add-two-binary-numbers/)。二进制数系统只有两个符号 0 和 1 所以二进制数只包含 0 和 1。在我们编写相加程序之前，让我们看看我们如何在纸上相加，如下图所示：  ## 示例：在 Java 中相加二进制数 在这个程序中，我们使用[`Scanner`](https://beginnersbook.com/2014/07/java-program-to-get-input-from-user/)从用户获取输入（用户输入我们需要相加的两个二进制数），然后我们使用[`while`循环](https://beginnersbook.com/2015/03/while-loop-in-java-with-examples/)逐位相加它们，并将结果存储在一个数组中。 ```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("输出： "); while (i >= 0) { System.out.print(sum[i--]); } System.out.print("\n"); } } ``` 输出： ```java Enter first binary number: 11100 Enter second binary number: 10101 输出： 110001 ``` Eclipse IDE 中的相同程序：  Eclipse 中程序的输出：  以下是一些相关的 java 示例： 1. [Java 程序：相加两个复数](https://beginnersbook.com/2018/09/java-program-to-add-two-complex-numbers/) 2. [Java 程序：相加两个数字](https://beginnersbook.com/2017/09/java-program-to-add-two-numbers/) 3. [Java 程序：相加数十进制数字](https://beginnersbook.com/2018/06/python-program-add-digits-number/)