Untuk me-rename file di Windows pake java

GetBigFile.java

package file;

import java.io.File;

public class GetBigFile extends  RenameFile{
	
	double maxSize;
	
	public GetBigFile(String source, double maxsize){
		super(source);
		this.maxSize = maxsize;
	}
	
	public void rename(String m){
		
		for(int i=0; i< filelist.length; i++){
			
			File f = filelist[i];
			if(!f.isDirectory()){
				 double  size = (double) f.length()/(1024*1024); //size in mb 
				 
				 if(size >= maxSize){
					 renameFile(f, m);
				 }
			}else{
				String path = f.getAbsolutePath().replace("\\", "/");
				new GetBigFile(path, maxSize).rename(m);
			} 
		}

	}
	
	public static void main(String[] args){
		
		String s = "D:/mamat";
		GetBigFile big = new GetBigFile(s, 2);
		big.rename("lebih besar dari 2 mb___");
		
		System.out.println("sukses...");
		
 	}

}

RenameFile.java

package file;

import java.io.File;

public  class RenameFile{

    File file;
    File filelist[];

	public RenameFile(String folder) {
		try {
			this.file  = new File(folder);
			filelist = file.listFiles();
		} catch (Exception e) {
			System.out.println("salah memasukkan nama folder.. !!");
		}
	}
	
	public  File getFile(){
		return this.file;
	}
	
	

	public void rename(String myString) {

		for (int i = 0; i < filelist.length; i++) {
			File file = filelist[i];
			
			if(!file.isDirectory() ){
				this.renameFile(file, myString);
			}else{
				String path = file.getAbsolutePath().replace("\\", "/");
				new RenameFile(path).rename(myString);
			}	
		}
	}
	
	
	
	protected void renameFile(File f, String myString){
		
		String b =  f.getAbsolutePath();
		int c  = b.lastIndexOf("\\");
		String temp = b.substring(0, c);
		String temp1 = b.substring(c+1, b.length());
		temp = temp.replace("\\", "/").concat("/");
		String dest = temp.concat(myString).concat(temp1);
		
		boolean sukses = f.renameTo(new File(dest));
		
		if(!sukses){
			System.out.println("gagal:  "+ f.getAbsolutePath());
		}
	}

        protected String  getRenameString(File f , String myString){
		
		String b =  f.getAbsolutePath();
		int c  = b.lastIndexOf("\\");
		String temp = b.substring(0, c);
		String temp1 = b.substring(c+1, b.length());
		temp = temp.replace("\\", "/").concat("/");
		String dest = temp.concat(myString).concat(temp1);
		
		return dest;
	}
	
	

	public static void main(String args[]) {

		String source= "D:/mamat";
		RenameFile rename = new RenameFile(source);
		rename.rename("equal__");
		System.out.println("\n FINISH");

	}
}