JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How to filter the files by file extensions and show the file names?


Description:

Below example shows how to get specific files from a folder. Sometimes we need to pic only specific extensions from the given folder. Implement FilenameFilter class and override accept() method, and add your filter logic here. Pass this object to list() method to get specific file extensions.


Code:
package com.java2novice.files;

import java.io.File;
import java.io.FilenameFilter;

public class MyFileFilter {

	public static void main(String a[]){
		File file = new File("C:/MyFolder/");
		String[] files = file.list(new FilenameFilter() {
			
			@Override
			public boolean accept(File dir, String name) {
				if(name.toLowerCase().endsWith(".csv")){
					return true;
				} else {
					return false;
				}
			}
		});
		for(String f:files){
			System.out.println(f);
		}
	}
}
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Java File IO Operations Sample Code Examples

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  2. Show list of all file names from a folder.
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  4. Filter the files by file extensions and show the file names.
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Knowledge Centre
wait Vs sleep methods
sleep(): It is a static method on Thread class. It makes the current thread into the "Not Runnable" state for specified amount of time. During this time, the thread keeps the lock (monitors) it has acquired.

wait(): It is a method on Object class. It makes the current thread into the "Not Runnable" state. Wait is called on a object, not a thread. Before calling wait() method, the object should be synchronized, means the object should be inside synchronized block. The call to wait() releases the acquired lock.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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