Java - Programa reemplazar una palabra en String

package classes;

public class JReplacer {

    private String _orig = "";

    /**

     * Provides read-only access to the original String object.

     * @return

     */

    public String getOriginalStr() { return _orig; }

    public JReplacer(String orig) {

        _orig = orig;

    }

    public String getReplaced(String substr, String replacingTxt) {

        return _orig.replace(substr, replacingTxt);

    }

}

package testinggui;

import classes.JReplacer;

import java.util.Scanner;

/**

 *

 * @author william

 */

public class TestingGUI {

    /**

     * @param args the command line arguments

     */

    private static String getStrFromKbd(String msg) {

        System.out.print(msg);

        Scanner scanner = new Scanner(System.in);

        return scanner.nextLine();

    }

    public static void main(String[] args) {

        String originalStr = getStrFromKbd("Enter original message: ");

        String chain2beReplaced = getStrFromKbd("Enter subtring to be replaced: ");

        String replacingText = getStrFromKbd("Enter replacing text: ");

        JReplacer replacer = new JReplacer(originalStr);

        System.out.println("******** RESULTS ******************");

        System.out.println(String.format("%s\t\t%s", "Original string was", originalStr));

        System.out.println(String.format("%s\t%s", "Substring to be replaced:", chain2beReplaced));

        System.out.println(String.format("%s\t\t%s", "Replacing text is:", replacingText));

        System.out.println(String.format("%s\t\t%s", "Final result is:", replacer.getReplaced(chain2beReplaced, replacingText)));

        // and that would be all friend!

    }

}

run:

Enter original message: This code is very clear

Enter subtring to be replaced: very clear

Enter replacing text: ******** RESULTS ******************

Original string was		This code is very clear

Substring to be replaced:	very clear

Replacing text is:		full of bells and whistles

Final result is:		This code is full of bells and whistles

full of bells and whistles

BUILD SUCCESSFUL (total time: 34 seconds)