I do not want to accept same letter to guess and if does , want to show caution

Question

I do not want to accept same letter to guess and if does , want to show caution and force

to type another try...

and If user got correct letter than I do want to show the letter instead of "_"

please help me out and please basic coding..

thank you in advance...




-----------------------------------------------------------------------------------------------------
import java.util.*;

public class HangmanTest
{
public static void main(String[] args)
{

String name;

Scanner keyboard = new Scanner(System.in);

Dictionary dic = new Dictionary();

System.out.println("Enter your name to begin....");
name = keyboard.nextLine();

System.out.println(dic.s);
System.out.println(dic.t);

System.out.println("The length of word is " + dic.s.length());

for(int counter = 0; counter < dic.s.length(); counter++)
{
System.out.print("_ ");
}

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

//System.out.println("Enter the alphabet.");
//String input = keyboard.nextLine();

//keyboard.nextLine();


StringBuffer gLetter = new StringBuffer();

String letter;
int maxTries = 7;
while(maxTries > 0)
{
System.out.println("The letters that you have guessed are: " + gLetter);
System.out.print("Please enter a letter to guess: ");

letter = keyboard.next();
gLetter.append(letter + " ");

if(dic.s.indexOf(letter) > 1)
{
System.out.println("Please enter one letter at a time");

}
else if(dic.s.indexOf(letter) != (-1))
{

dic.s.indexOf(letter);
System.out.println("correct");
System.out.println(letter);
}
else
maxTries--;
System.out.println("You have " + maxTries + " wrong guesses left.");
}





}




}



--------------------------------------------------------------------------------------------------------

import java.util.Scanner;

public class Dictionary
{
String words[] = {"dictionary", "technology", "federation", "restaurant", "collection", "enterprise", "television", "communicate", "exaggerate", "responsive"
, "automobile", "cappuccino"};


String s = words[(int)Math.floor(Math.random() * words.length)];




int t = s.length();






Dictionary()
{

}



}

Explanation / Answer

please rate - and see your messages

import java.util.*;
import java.lang.*;
public class HangmanTest
{
public static void main(String[] args)
{

String name;

Scanner keyboard = new Scanner(System.in);

Dictionary dic = new Dictionary();

System.out.println("Enter your name to begin....");
name = keyboard.nextLine();

System.out.println(dic.s);
System.out.println(dic.t);

System.out.println("The length of word is " + dic.s.length());
StringBuffer word = new StringBuffer();
for(int i = 0; i < dic.s.length(); i++)
word.append("_ ");
System.out.println(word);
/*
for(int counter = 0; counter < dic.s.length(); counter++)
{
System.out.print("_ ");
}
*/
System.out.println("");
System.out.println("");

//System.out.println("Enter the alphabet.");
//String input = keyboard.nextLine();

//keyboard.nextLine();


StringBuffer gLetter = new StringBuffer();
boolean used;
String letter;
int maxTries = 7;
while(maxTries > 0)
{
System.out.println("The letters that you have guessed are: " + gLetter);

do
{used=false;
System.out.print("Please enter a letter to guess: ");

letter = keyboard.next();
if(gLetter.indexOf(letter)>=0)
   {used=true;
    System.out.println(letter +" has already been guessed");
    }
   
}while(used);
gLetter.append(letter + " ");

if(dic.s.indexOf(letter) != (-1))
{
word.setCharAt(dic.s.indexOf(letter,dic.s.indexOf(letter) )*2,letter);
System.out.println("****"+dic.s.indexOf(letter,dic.s.indexOf(letter) ));
System.out.println("correct");
System.out.println(letter);
System.out.println(word);
}
else
maxTries--;
System.out.println("You have " + maxTries + " wrong guesses left.");
}





}




}

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