John Michael Rivera John Michael Rivera - 1 year ago 78
Java Question

Java replace characters in a string except for the given value in a variable

Need some help.
So here is the task:
Create a program that will ask for a main phrase. Ask for a key string value that will be preserved in the phrase. Display a version of the original main phrase where all chars have been replaced by pluses ("+"), except for appearances of the key string value which are preserved unchanged.

Sample outputs:

Enter main phrase: 12xy34
Enter key string:xy

New Version: ++xy++

Enter main phrase: 12xy34
Enter key string:1

New Version: 1+++++

Enter main phrase: 12xy34xyabcxy
Enter key string:xy
New Version: ++xy++xy+++xy

Here is my code:

import java.util.*;
public class Corpuz_Kervin
public static void main (String [] args)
Scanner input = new Scanner (;
String phrase,key= "";
String plus = "+";

System.out.print("Enter main phrase : ");
phrase = input.nextLine();
System.out.print("Enter key string : ");
key = input.nextLine();

for (int i = 0; i < phrase.length(); i++)
char x = phrase.charAt(i);
if (x.contains(key))

Can anyone help me

Answer Source

Use this instead of your loop:

System.out.println(phrase.replaceAll("[^" + key + "]", plus));
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