ReplaceText

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

public class ReplaceText {
public static void main(String[] args) throws FileNotFoundException {
  // Check command-line parameter usage
  if(args.length != 4) {
   System.out.println(
     "Usage: java ReplaceText sourceFile targetFile oldStr newStr");
   System.exit(0);
  }

  // Check if source file exists
  File sourceFile = new File(args[0]);
  if(!sourceFile.exists()) {
   System.out.println("Source file " + args[0] + " does not exists");
   System.exit(0);
  }

  // Check if targer file exists
  File targetFile = new File(args[1]);
  if(targetFile.exists()) {
   System.out.println("Target file " + args[1] + " already exists");
   System.exit(0);
  }

  // Create a Scanner for input and PrintWriter for output
  Scanner input = new Scanner(sourceFile);
  PrintWriter output = new PrintWriter(targetFile);

  while(input.hasNext()) {
   String s1 = input.nextLine();
   String s2 = s1.replaceAll(args[2], args[3]);
   output.println(s2);
  }

  input.close();
  output.close();
}
}

java ReplaceText sourcrFile targerFile oldString newString

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