Solved

Applet help - please...

Posted on 1998-07-20
13
170 Views
Last Modified: 2013-11-23
I am trying to develop a simple applet - that when the applet starts generates three random numbers between -10 and +10.  The basics of the applet are that two of the numbers (Num1 and Num2) are summed and then the third number is the answer.  The user enters either (<, = or >) to make the statement true.  I can get the random numbers splatted to the applet, but I can not figure out how  to compare the value entered against the mathmatical expression (Num1 +  Num2 (<, =, >) Num3) - if the proper symbol is selected and the statement evaluates to true "Correct!" is displayed on the applet - or "Incorrect!' is displayed...

Also, there is a button on the applet that clears the values and generates three new random numbers and will do so until the user exits the applet...

Here is the code that I have can anyone help me??

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public class Game extends Applet implements ActionListener {

      TextField numOne;
      TextField numTwo;
      TextField compare;
      Label plusLabel;
      TextField answer;
      Button NextProblem;
      int value;
      int value1;
      int value2;
      int One;
      int Two;
      int Three;
      int sum;
      int result;
      String sign;
      TextField  correct;

      public void init()
   {

       // sets color and fonts sets up Applet display/look
    setBackground(Color.lightGray);
    setFont(new Font("SansSerif", Font.BOLD, 12));

      // TextFields - Label and Button for UI
    numOne = new TextField();
      numOne.setBounds( 5, 5, 10, 12);
    add( numOne );
      numOne.setEditable( false);

    plusLabel = new Label("+");
      plusLabel.setBounds( 15, 5, 5, 18 );
    plusLabel.setFont(new Font( "SansSerif", Font.BOLD, 18 ) );
    add( plusLabel );

    numTwo = new TextField();
      numTwo.setBounds( 20, 5, 10, 12 );
    add( numTwo );
      numTwo.setEditable( false );

    compare = new TextField();
      compare.setBounds( 30, 5, 10, 12 );
    add( compare );

    answer = new TextField();
      answer.setBounds( 40, 35, 10, 12 );
      add( answer );
      answer.setEditable( false );

       // Button to trigger new random number(s) generation and start game again
    NextProblem = new Button("Next Problem");
      NextProblem.setBounds( 5, 60, 40, 12 );
    add( NextProblem );

    correct = new TextField();
      correct.setBounds( 5, 80, 80, 20 );
      add( correct );


            value = 1 + (int)  (( Math.random() * 20 ) - 10);
            value1 = 1 + (int) (( Math.random() * 20 ) - 10);
            value2 = 1 + (int) (( Math.random() * 20 ) - 10);

            numOne.setText( Integer.toString( value ) );
            numTwo.setText( Integer.toString( value1 ) );
            answer.setText( Integer.toString( value2 ) );

      //compare.addActionListener(this);

    NextProblem.addActionListener(this);

    }


       // ActionEvent performed
    public void actionPerformed(ActionEvent e)
    {

            numOne.setText( "" );
            numTwo.setText( "" );
            answer.setText( "" );

            value = 1 + (int)  (( Math.random() * 20 ) - 10);
            value1 = 1 + (int) (( Math.random() * 20 ) - 10);
            value2 = 1 + (int) (( Math.random() * 20 ) - 10);

            numOne.setText( Integer.toString( value ) );
            numTwo.setText( Integer.toString( value1 ) );
            answer.setText( Integer.toString( value2 ) );

            correct.setText( "" );

    One = Integer.valueOf(numOne.getText()).intValue();
    Two = Integer.valueOf(numTwo.getText()).intValue();
    Three = Integer.valueOf(answer.getText()).intValue();

      sign = answer.getText();
      sum = One + Two;
      result = Three;

if (sum > result)
        {
                if (sign == ">")
                        correct.setText("Correct!");
                else
        if (sum < result)
                if (sign == "<")
                        correct.setText("Correct!");
                else
        if (sum == result)
                if (sign == "=")
                        correct.setText("Correct!");
                else
                        correct.setText("Incorrect!");
       

             }
      }
}

0
Comment
Question by:n2chiles
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 8
  • 5
13 Comments
 

Author Comment

by:n2chiles
ID: 1227146
Edited text of question
0
 

Author Comment

by:n2chiles
ID: 1227147
Edited text of question
0
 
LVL 6

Accepted Solution

by:
gadio earned 100 total points
ID: 1227148
Here is a fix for your prog. If you have Qs, feel free to ask.

import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;

public class small_game extends Applet implements ActionListener, TextListener {

    TextField numOne;
    TextField numTwo;
    TextField compare;
    Label plusLabel;
    TextField answer;
    Button NextProblem;
    int value;
    int value1;
    int value2;
    int One;
    int Two;
    int Three;
    int sum;
    int result;
    String sign;
    TextField  correct;

    public void init()
       {

    // sets color and fonts sets up Applet display/look
        setBackground(Color.lightGray);
        setFont(new Font("SansSerif", Font.BOLD, 12));

    // TextFields - Label and Button for UI
        numOne = new TextField();
    numOne.setBounds( 5, 5, 10, 12);
        add( numOne );
    numOne.setEditable( false);

        plusLabel = new Label("+");
    plusLabel.setBounds( 15, 5, 5, 18 );
        plusLabel.setFont(new Font( "SansSerif", Font.BOLD, 18 ) );
        add( plusLabel );

        numTwo = new TextField();
    numTwo.setBounds( 20, 5, 10, 12 );
        add( numTwo );
    numTwo.setEditable( false );

        compare = new TextField();
    compare.setBounds( 30, 5, 10, 12 );
    compare.addTextListener(this);
        add( compare );

        answer = new TextField();
    answer.setBounds( 40, 35, 10, 12 );
    add( answer );
    answer.setEditable( false );

    // Button to trigger new random number(s) generation and start game again
        NextProblem = new Button("Next Problem");
    NextProblem.setBounds( 5, 60, 40, 12 );
        add( NextProblem );

        correct = new TextField(10);
    //correct.setBounds( 5, 80, 80, 20 );
    add( correct );


    value = 1 + (int)  (( Math.random() * 20 ) - 10);
    value1 = 1 + (int) (( Math.random() * 20 ) - 10);
    value2 = 1 + (int) (( Math.random() * 20 ) - 10);

    numOne.setText( Integer.toString( value ) );
    numTwo.setText( Integer.toString( value1 ) );
    answer.setText( Integer.toString( value2 ) );

    //compare.addActionListener(this);

        NextProblem.addActionListener(this);

        }


    public void textValueChanged( TextEvent te ) {

    if( correct == null ) return;

        One = Integer.valueOf(numOne.getText()).intValue();
        Two = Integer.valueOf(numTwo.getText()).intValue();
        Three = Integer.valueOf(answer.getText()).intValue();

    sign = compare.getText();

    sum = One + Two;
    result = Three;

    if (sum > result)
            {
                    if (sign.equals( ">" )) {
                            correct.setText("Correct!");
                            compare.setEditable(false);
                    }
                    else
            if (sum < result)
                    if (sign.equals("<")) {
                            correct.setText("Correct!");
                            compare.setEditable(false);
                    }
                    else
            if (sum == result)
                    if (sign.equals("=") ) {
                            correct.setText("Correct!");
                            compare.setEditable(false);
                    }
                    else {
                            correct.setText("Incorrect!");
                            compare.setEditable(false);
                    }


      }
    }

    // ActionEvent performed
        public void actionPerformed(ActionEvent e)
        {
    correct.setText( "" );

    numOne.setText( "" );
    numTwo.setText( "" );
    answer.setText( "" );

    value = 1 + (int)  (( Math.random() * 20 ) - 10);
    value1 = 1 + (int) (( Math.random() * 20 ) - 10);
    value2 = 1 + (int) (( Math.random() * 20 ) - 10);

    numOne.setText( Integer.toString( value ) );
    numTwo.setText( Integer.toString( value1 ) );
    answer.setText( Integer.toString( value2 ) );
    compare.setEditable(true);

    }
}


0
Creating Instructional Tutorials  

For Any Use & On Any Platform

Contextual Guidance at the moment of need helps your employees/users adopt software o& achieve even the most complex tasks instantly. Boost knowledge retention, software adoption & employee engagement with easy solution.

 
LVL 6

Expert Comment

by:gadio
ID: 1227149
The finding and checking of the sign works, but you still have some logical bugs there.  :-)  Thats for you to fix...
0
 

Author Comment

by:n2chiles
ID: 1227150
Gadio,

Thanks,  I appreciate the pointers and your assistance.

Have a good one...

map
0
 

Author Comment

by:n2chiles
ID: 1227151
Gadio,

I have had time to evaluate and the Nested IF statement only evaluates the first of the three signs in the body of the if statement...

any ideas...


0
 
LVL 6

Expert Comment

by:gadio
ID: 1227152
Yes. Looking at it again, youl see that all the evaluation section is in this condition:

 if (sum > result)

So, only in that condition ANY other condition is evaluated...
0
 

Author Comment

by:n2chiles
ID: 1227153
Gadio,

I tried playing with the nested IF statements and got nowhere with it...

I have been tinkering with the Switch statement but can't get it through the compiler...

I am taking a closer look at the way the ActionListener works and why I can't use the Switch in TextListener - I am starting to get frustrated because being new at Java I am not too experienced with the syntax and that is what seems to be tripping me up...

You know how to use it and when to use it...

map
0
 

Author Comment

by:n2chiles
ID: 1227154
Gadio,

I tried playing with the nested IF statements and got nowhere with it...

I have been tinkering with the Switch statement but can't get it through the compiler...

I am taking a closer look at the way the ActionListener works and why I can't use the Switch in TextListener - I am starting to get frustrated because being new at Java I am not too experienced with the syntax and that is what seems to be tripping me up...

You know how to use it and when to use it...

map
0
 
LVL 6

Expert Comment

by:gadio
ID: 1227155
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;

public class small_game extends Applet implements ActionListener, TextListener {

  TextField numOne;
  TextField numTwo;
  TextField compare;
  Label plusLabel;
  TextField answer;
  Button NextProblem;
  int value;
  int value1;
  int value2;
  int One;
  int Two;
  int Three;
  int sum;
  int result;
  String sign;
  TextField  correct;

  public void init()
  {

    // sets color and fonts sets up Applet display/look
        setBackground(Color.lightGray);
        setFont(new Font("SansSerif", Font.BOLD, 12));

    // TextFields - Label and Button for UI
        numOne = new TextField();
    numOne.setBounds( 5, 5, 10, 12);
        add( numOne );
    numOne.setEditable( false);

        plusLabel = new Label("+");
    plusLabel.setBounds( 15, 5, 5, 18 );
        plusLabel.setFont(new Font( "SansSerif", Font.BOLD, 18 ) );
        add( plusLabel );

        numTwo = new TextField();
    numTwo.setBounds( 20, 5, 10, 12 );
        add( numTwo );
    numTwo.setEditable( false );

        compare = new TextField();
    compare.setBounds( 30, 5, 10, 12 );
    compare.addTextListener(this);
        add( compare );

        answer = new TextField();
    answer.setBounds( 40, 35, 10, 12 );
    add( answer );
    answer.setEditable( false );

    // Button to trigger new random number(s) generation and start game again
        NextProblem = new Button("Next Problem");
    NextProblem.setBounds( 5, 60, 40, 12 );
        add( NextProblem );

        correct = new TextField(10);
    //correct.setBounds( 5, 80, 80, 20 );
    add( correct );


    value = 1 + (int)  (( Math.random() * 20 ) - 10);
    value1 = 1 + (int) (( Math.random() * 20 ) - 10);
    value2 = 1 + (int) (( Math.random() * 20 ) - 10);

    numOne.setText( Integer.toString( value ) );
    numTwo.setText( Integer.toString( value1 ) );
    answer.setText( Integer.toString( value2 ) );

    //compare.addActionListener(this);

        NextProblem.addActionListener(this);

  }


  public void textValueChanged( TextEvent te ) {

    if( correct == null ) return;

        One = Integer.valueOf(numOne.getText()).intValue();
        Two = Integer.valueOf(numTwo.getText()).intValue();
        Three = Integer.valueOf(answer.getText()).intValue();

    sign = compare.getText();

    sum = One + Two;
    result = Three;

    if ( sign.equals( ">" ) || sign.equals("<") || sign.equals("=") ) {
          if ( (sum > result && sign.equals( ">" )) ||
                   (sum < result && sign.equals("<")) ||
                   (sum == result && (sign.equals("=") )) ) {
                correct.setText("Correct!");
                compare.setEditable(false);
          }
          else {
                correct.setText("Incorrect!");
                compare.setEditable(false);
          }
        }
        else if( ! sign.equals("") ) compare.setText("");
  }

  // ActionEvent performed
  public void actionPerformed(ActionEvent e)
  {
    correct.setText( "" );
    compare.setText( "" );

    numOne.setText( "" );
    numTwo.setText( "" );
    answer.setText( "" );

    value = 1 + (int)  (( Math.random() * 20 ) - 10);
    value1 = 1 + (int) (( Math.random() * 20 ) - 10);
    value2 = 1 + (int) (( Math.random() * 20 ) - 10);

    numOne.setText( Integer.toString( value ) );
    numTwo.setText( Integer.toString( value1 ) );
    answer.setText( Integer.toString( value2 ) );
    compare.setEditable(true);

  }
}

Enjoy.
G.
0
 

Author Comment

by:n2chiles
ID: 1227156
G.

Thanks,

The only other problem is that I can not figure out how to ge the LayoutManager to let me null it out so I can use the setBounds() to position the labels and TextField on the applet.

I believe it is the FlowLayout that is the default LayoutManger for applet - but how in the H - E - double hockey sticks do you null it out??

Thanks again...

map
0
 

Author Comment

by:n2chiles
ID: 1227157
G.

I figured it out...

setLayout( null );

that worked great!!

Thanks for a prod - poke and the swift kick in the behind...

It has helped me learn a great deal and reduced the stress levels too!!

Thanks again,

map
0
 
LVL 6

Expert Comment

by:gadio
ID: 1227158
Happy to be of help.
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Print Rhino Java Array in Javascript 1 57
Java Eclipse Loop 3 47
ArrayList Adding/settign data 3 37
Coding for the first time 9 100
For beginner Java programmers or at least those new to the Eclipse IDE, the following tutorial will show some (four) ways in which you can import your Java projects to your Eclipse workbench. Introduction While learning Java can be done with…
By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
Viewers will learn about if statements in Java and their use The if statement: The condition required to create an if statement: Variations of if statements: An example using if statements:
This video teaches viewers about errors in exception handling.
Suggested Courses

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question