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                # Java 程序:二進制到八進制的轉換 > 原文: [https://beginnersbook.com/2019/04/java-binary-to-octal-conversion/](https://beginnersbook.com/2019/04/java-binary-to-octal-conversion/) 在本教程中,我們將看到如何借助示例將二進制數轉換為八進制數。 ## 二進制到八進制轉換示例 要將二進制數轉換為八進制數,我們可以使用`Integer.toOctalString()`方法,該方法將二進制數作為參數并返回一個字符串,該字符串是傳遞的二進制數的八進制等效值。 這里我們給出了一個`String`形式的二進制數,我們首先使用`Integer.parseInt()`方法將字符串轉換為基數 2(二進制數),我們將結果存儲在整數`bnum`中。然后我們將這個二進制數`bnum`傳遞給`Integer.toOctalString()`方法以獲取八進制數。 ```java public class JavaExample{ public static void main(String args[]){ /* To take input from user, import the java.util.Scanner * package and write the following lines * Scanner scanner = new Scanner(System.in); * System.out.println("Enter the number: "); * int bnum = Integer.parseInt(scanner.nextLine(), 2); */ String number = "10101"; int bnum = Integer.parseInt(number, 2); String ostr = Integer.toOctalString(bnum); System.out.println("Octal Value after conversion is: "+ostr); } } ``` **輸出:** ![Java binary to Octal conversion](https://img.kancloud.cn/b8/62/b862ed6a7a6bf70dc10f101ea0550e8f_1024x719.jpg) 如評論中所示,如果我們想從用戶那里獲取二進制數而不是硬編碼值,那么我們可以導入`java.util.Scanner`包并使用以下代碼行: ```java Scanner scanner = new Scanner(System.in); System.out.println("Enter the number: "); int bnum = Integer.parseInt(scanner.nextLine(), 2); ```
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