Java FileStore getUnallocatedSpace()用法及代碼示例

FileStore類的getUnallocatedSpace()方法用於獲取文件存儲中未分配的字節數。此方法可用於檢查可用空間。此方法將可用的未分配空間作為long值返回。

用法:

public abstract long getUnallocatedSpace()
                     throws IOException

參數：此方法不接受任何內容。

返回值：此方法將可用的未分配空間作為long值返回。

異常：如果發生I /O錯誤，則此方法將引發IOException。

以下示例程序旨在說明getUnallocatedSpace()方法：
示例1:

// Java program to demonstrate 
// FileStore.getUnallocatedSpace() method 
  
import java.io.IOException; 
import java.nio.file.FileStore; 
import java.nio.file.Files; 
import java.nio.file.Path; 
import java.nio.file.Paths; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
        // create the object of Path 
        Path path 
            = Paths.get( 
                "E:\\Tutorials\\file.txt"); 
  
        // get FileStore object 
        try { 
  
            FileStore fs 
                = Files.getFileStore(path); 
  
            // print FileStore name and Total unused size 
            System.out.println("FileStore Name: "
                               + fs.name()); 
            long bytes = fs.getUnallocatedSpace(); 
            long sizeInGB = bytes / (1024 * 1024 * 1024); 
            System.out.println("Free Space : "
                               + sizeInGB + "GB"); 
        } 
        catch (IOException e) { 
  
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
    } 
}

輸出：

示例2:

// Java program to demonstrate 
// FileStore.getUnallocatedSpace() method 
  
import java.io.IOException; 
import java.nio.file.FileStore; 
import java.nio.file.Files; 
import java.nio.file.Path; 
import java.nio.file.Paths; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
        // create the object of Path 
        Path path 
            = Paths.get( 
                "C:\\Movies\\001.txt"); 
  
        // get FileStore object 
        try { 
  
            FileStore fs 
                = Files.getFileStore(path); 
  
            // print FileStore name and Total size 
            System.out.println("FileStore Name: "
                               + fs.name()); 
            System.out.println("Free Space in bytes: "
                               + fs.getUnallocatedSpace()); 
        } 
        catch (IOException e) { 
  
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
    } 
}

輸出：

參考：https://docs.oracle.com/javase/10/docs/api/java/nio/file/FileStore.html#getUnallocatedSpace()

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注：本文由純淨天空篩選整理自AmanSingh2210大神的英文原創作品 FileStore getUnallocatedSpace() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。