Here is a simple program of Hangman game.

import java.util.*;

public class Hangman{
    public static void main( String[] args){
        Scanner scan = new Scanner( System.in);
        int totalMistake = 0;
        boolean b = false;

        System.out.println("Welcome to Hangman Game:)!!" );
        SecretWord word = new SecretWord();
        Input input = new Input();
        while(totalMistake < 4 && !word.isSolved()){
            System.out.println(word);
            char c = input.getNewLetter();
            if (!word.update(c))
                totalMistake = totalMistake + 1 ;
        }
        if (word.isSolved())
            System.out.println("Great, you done it.");
        else
            System.out.println("Sorry, too many errors.");
    }
 }

class SecretWord{
    String  visible, secret;

public SecretWord(){
    String [] wordList = { "Giraffe", "Camel", "Lion", "Bear","Zebra","Monkey","Leopard","Rhinoceros","Elephant","Dear" };
    int rand;
    rand = (int) (Math.random()*4);
    secret = wordList[rand];
    int wordLength = secret.length();

    visible = "";
    for( int i = 0; i < secret.length(); i++){
        char c = secret.charAt(i);
        if( c == ' ' )
            visible += c;
        else
            visible += '_';
     }
   }
    public String toString(){
       return visible;
    } 
    public boolean update(char c){
        char[] secretArray = new char[secret.length()];
        char[] visibleArray = new char[secret.length()];
        String s = "";
        boolean contains = false ;

        for(int i = 0; i < secret.length(); i++){
            secretArray[i] = secret.charAt(i);
            visibleArray[i] = visible.charAt(i);
        }
        for(int k = 0; k < secret.length();k++){
            if(secretArray[k] == c){
                visibleArray[k] = c;
                contains = true;
            }
        }
        for(int m=0; m < secret.length(); m++ )
        {
            s = s + visibleArray[m];
        }
        visible = s;

        return contains;
   }
    public boolean isSolved()
    {   
        return secret.equalsIgnoreCase(visible);
    }
}

 class Input
{   
   ArrayList<String> keyList ; 
    boolean chosen;

    public Input()
    {
        keyList = new ArrayList<String>();
    }

    public void keyChosen( String key )
    {
        keyList.add( key );
    }

    public boolean hasBeenChosen( String key)
    {
        chosen = keyList.contains( key );
        return chosen;
    }

    public char getNewLetter() 
    {
        Scanner scan=new Scanner( System.in);
        char a;
        boolean chosen;
        String aTmp;   
        do
        {   
            System.out.println("Enter a Letter");
            a = scan.next().charAt( 0); 
            aTmp = "" + a;
            chosen = hasBeenChosen( aTmp);
            if(!chosen)
                keyChosen( aTmp);
            else
            {   
                System.out.println("You've already used that one. Please enter a new Letter");
            }
       }
        while(chosen);
        return a;  
    }
}

Can you please show me how to do the following using Jframe form?