language: Java (sun-jdk-1.7.0_10)
date: 235 days 11 hours ago
link:
visibility: public 
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import java.util.*;
import java.lang.*;
 
class Main
{
        public static void main (String[] args) throws java.lang.Exception
        {
                String original = "Hello world!";
        String hidden = "_____ ______";
        StringBuilder builder = new StringBuilder( hidden );
        char guess = 'l';
        int index = original.indexOf( guess );
        while (index >= 0) {
            builder.setCharAt( index, guess );
            index = original.indexOf( guess, index + 1 );
        }
 
        hidden = builder.toString();
        System.out.println( hidden );
        }
}