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Applet help - please...

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!");

           }
      }
}

n2chiles

ASKER

Edited text of question

n2chiles

ASKER

Edited text of question

ASKER CERTIFIED SOLUTION

gadio

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gadio

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

n2chiles

ASKER

Gadio,

Thanks, I appreciate the pointers and your assistance.

Have a good one...

map

n2chiles

ASKER

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...

gadio

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...

n2chiles

ASKER

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

n2chiles

ASKER

gadio

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.

n2chiles

ASKER

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

n2chiles

ASKER

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

gadio

Happy to be of help.