FileCopy.java

/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class FileCopy
{
	public static void main (String[] args) throws java.lang.Exception
	{
		File file = new File("Path goes here"); 
		File outputFile = null;
		try{
		outputFile = createFile();
		}catch(Exception e){
			e.printStackTrace();
		}
		StringBuilder sb = new StringBuilder();
  BufferedReader br = new BufferedReader(new FileReader(file)); 
  
		String st; 
		while ((st = br.readLine()) != null) {
		    System.out.println(st); 
		    if(st.contains("=")){
		    	sb.append(st);
		    	sb.append("\n");
		    }
		}
		try{
		  writeToFile(sb.toString(),outputFile);
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	
	private static File createFile() throws Exception {
		File myObj = new File("filename.txt");
      if (myObj.createNewFile()) {
        System.out.println("File created: " + myObj.getName());
      } else {
        System.out.println("File already exists.");
      }
      return myObj;
	}
	
	private static void writeToFile(String data,File file) throws Exception {
		FileWriter myWriter = new FileWriter(file.getName());
      myWriter.write(data);
      myWriter.close();
	}
}