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Java Java Objects Creating the MVP Scrabble Tiles

Posted by Michael Stedman
.a{fill-rule:evenodd;}techdegree
Michael Stedman
Full Stack JavaScript Techdegree Student 13,838 Points

Completely stumped on second objective of the first Code Challenge of Creating the MVP course. Any help?

No matter what I do, I cannot get passed the second half of this particular code challenge. A couple of things that I have tried so far gives me the "Bummer" red X and says there are several ways to solve the problem, but it wants me to do something specific. Can someone post up what it is that they typed for the answer that allowed them to pass the second part of the Code Challenge and move on with credit for it?

Below I will quote the question/instruction, and below that I'll post the code that I currently have (which is just the code the challenge provides with the exception of what I completed in the "TODO" for the addTile method which was part of objective 1 for the Code Challenge)

"Correct the existing hasTile method to return true if the tile is in the tiles field, and false if it isn't. You can solve this a few ways, however, I'd like you to practice returning the result of the expression that is uses the index of a char in a String."

public class ScrabblePlayer {
  // A String representing all of the tiles that this player has
  private String tiles;

  public ScrabblePlayer() {
    tiles = "";
  }

  public String getTiles() {
    return tiles;
  }

  public void addTile(char tile) {
    // TODO: Add the tile to tiles
    tiles += tile;
  }

  public boolean hasTile(char tile) {
    // TODO: Determine if user has the tile passed in
    return false;
  }

}
ScrabblePlayer.java 
public class ScrabblePlayer {
  // A String representing all of the tiles that this player has
  private String tiles;

  public ScrabblePlayer() {
    tiles = "";
  }

  public String getTiles() {
    return tiles;
  }

  public void addTile(char tile) {
    // TODO: Add the tile to tiles
    tiles += tile;
  }

  public boolean hasTile(char tile) {
    // TODO: Determine if user has the tile passed in
    return false;
  }

}
Michael Stedman
.a{fill-rule:evenodd;}techdegree
Michael Stedman
Full Stack JavaScript Techdegree Student 13,838 Points

I guess somehow it pasted in the ScrabblePlayer.java code which is the same that I copy/pasted.

8 Answers

Michael Stedman
seal-mask
.a{fill-rule:evenodd;}techdegree
Michael Stedman
Full Stack JavaScript Techdegree Student 13,838 Points
Michael Stedman
.a{fill-rule:evenodd;}techdegree
Michael Stedman
Full Stack JavaScript Techdegree Student 13,838 Points

So.... Finally figured it out and answered it myself. Utilizing the corrected typo in the instruction sentence, and the several comments from Craig Dennis I was able to fiddle around and get the answer. Literally, it was just a bunch of trial and error and piecing things together from the comments Craig made. I'm going to go ahead and paste the code that I got that allowed me to pass the second objective as ONLY after looking at it (after I knew it passed) did I actually understand how it was what Craig was talking about. Finally getting to see it is what gave me the opportunity to understand it as asking on here I have to wait for answers to pop up, and then some are not always what the exact answer needed. Thanks for a tough one, Craig Dennis!

  public void addTile(char tile) {
    // TODO: Add the tile to tiles
    tiles += tile;
  }

  public boolean hasTile(char tile) {
    // TODO: Determine if user has the tile passed in
    return tiles.indexOf(tile) >= 0;
  }
Fabian Pijpers
PLUS
Fabian Pijpers
Courses Plus Student 41,372 Points
Fabian Pijpers
Fabian Pijpers
Courses Plus Student 41,372 Points

Thanks, Michael I was getting close but missed out. The problem i had was trying to throw an if else blok around it. The solution is much easier.

Sean McLImans
Sean McLImans
4,559 Points
Sean McLImans
Sean McLImans
4,559 Points

Thank you. I was stumped as well. I was trying to do an if else statement. Another possible answer is:

public boolean hasTile(char tile) { // TODO: Determine if user has the tile passed in return tiles.indexOf(tile) != -1; }

Junjie Huang
Junjie Huang
4,704 Points
Junjie Huang
Junjie Huang
4,704 Points

Take a look at indexOf method: https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#indexOf(java.lang.String)

If no such value of k exists, then -1 is returned.

harvey Spectre
PLUS
harvey Spectre
Courses Plus Student 1,423 Points
harvey Spectre
harvey Spectre
Courses Plus Student 1,423 Points

public class ScrabblePlayer { // A String representing all of the tiles that this player has private String tiles;

public ScrabblePlayer() { tiles = ""; }

public String getTiles() { return tiles; }

public void addTile(char tile) { // TODO: Add the tile to tiles tiles+=tile;

}

public boolean hasTile(char tile) {

 return tiles.indexOf(tile) > -1;

}

}

aroshinemunasinghe
aroshinemunasinghe
5,649 Points
aroshinemunasinghe
aroshinemunasinghe
5,649 Points

Hi thanks for sharing you thought Here is what I have been tried to solved out his quiz. He wrote " *if the tiles is in the ..." So I thought aha just if states but then got a bummer even thought I got same answers like you got tiles.indexOf(tile) >= 0

 ```Java
       public boolean hasTile(char tile) {
    // TODO: Determine if user has the tile passed in
    /*
    return true if the tiles is in the tiles files, and false if it isnt. you can solve this a few ways
    however I like to practise returning the result of the expression that uses thee index of a char in a string.
     */

    if (tiles.indexOf(tile) >= 0) {
        return true;

    } else {
        return false;
    }
}
 ```

But got a bummer again: Bummer! While you could definitely solve this using an if statement, try returning the result of the expression.

" Try to returning the result of the expression" ahha ? no if states then just return. But ?? Why? In logically it is correct, it is OK to write this way, I could get passed

Muhammad Asif
PLUS
Muhammad Asif
Courses Plus Student 557 Points
Muhammad Asif
Muhammad Asif
Courses Plus Student 557 Points

public class ScrabblePlayer {

// A String representing all of the tiles that this player has private String tiles;

public ScrabblePlayer() { tiles = "";

}

public String getTiles() { return tiles; }

public void addTile(char tile) { // TODO: Add the tile to tiles tiles+=tile;

}

public boolean hasTile(char tile) { // TODO: Determine if user has the tile passed in

return tiles.indexOf(tile) >= 0;

} }

Fabian Pijpers
PLUS
Fabian Pijpers
Courses Plus Student 41,372 Points
Fabian Pijpers
Fabian Pijpers
Courses Plus Student 41,372 Points

public boolean hasTile(char tile) { // TODO: Determine if user has the tile passed in if (titles.indexOf(tile) >= 0) { hasTile = true; } else{ hasTile = false
} }