利用 Java 檢查檔案或目錄的大小 (Use Java to check size of a file or a directory)

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1	import java.io.File

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public static long filesize(File file){     long size = 0L;     if (file.isFile()){         size = file.length();     } else if (file.isDirectory()){         File[] nFiles = file.listFiles();         for (File nFile : nFiles){             size += filesize(nFile);         }     }     return size; }