getfileproperity.java

java入门经典教程 java入门经典教程 java入门经典教程

// 例 5.2.1 GetFileProperity.java
import java.io.*;
import java.util.*;
public class GetFileProperity 
{
	public GetFileProperity(String fileName)
	{
		File file = new File(fileName);
		if (file.exists())             // 判断该对象是否存在
		{
			System.out.println("File Name: "+file.getName());
			System.out.println("File Path: "+file.getPath());
			System.out.println("Absolute Path: "+file.getAbsolutePath());
			System.out.println("File Parent: "+file.getParent());
			if (file.canWrite())
				System.out.println(file.getName()+" is writable");
			else
				System.out.println(file.getName()+" is not writable");
			
			if (file.canRead())
				System.out.println(file.getName()+" is readable");
			else
				System.out.println(file.getName()+" is not readable");
			
			if (file.isFile())
				System.out.println(file.getName()+" is a file");
			else if (file.isDirectory())
				System.out.println(file.getName()+" is a directory");
			else
				System.out.println(file.getName()+" is unknown!");
			
	        long time = file.lastModified();
			System.out.println("Last modified at "+new Date(time));
			System.out.println("File Size: "+file.length());
		}
		else
			System.out.println("File not found");
	}
	public static void main(String[] args)
	{
		if (args.length == 1)
		{
			GetFileProperity getFilePro = new GetFileProperity(args[0]);
		}
		else if (args.length > 1)
			System.out.println("Error: you input more than one file name");
		else
			System.out.println("Error: you do not input a file name!");
	}
}