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Thread: Java Applets

  1. #1
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    Default Java Applets

    Hi, I am relatively new to applets, hence having some problems when it comes to handling event driven code.

    Below is a java applet code. All I want is when the button called "Example" is pressed, the three textfields, tf1, tf2 and tf3 should show the values 5000, 6 and 8. will someone please help, thanks for the time.




    import java.awt.*; import javax.swing.*; import java.awt.event.*;
    import java.text.DecimalFormat;

    public class money_time extends JApplet implements ActionListener{
    JTextField tf1, tf2, tf3, tf4;
    JLabel label1, label2, label3, label4;
    JButton b1, b2;

    public void init(){
    setLayout( new FlowLayout());
    label1 = new JLabel( " Enter deposit amount" );
    tf1 = new JTextField( 10 );
    label2 = new JLabel( " Enter interest rate" );
    tf2 = new JTextField( 10 );
    label3 = new JLabel( " Enter number of years" );
    tf3 = new JTextField( 10 );
    label4 = new JLabel( " Future Amount" );
    tf4 = new JTextField( 10 );
    b1 = new JButton( "Enter" );
    b1.addActionListener( this );
    b2 = new JButton( "Example" );
    b2.addActionListener( this );
    add(label1); add(label2); add(label3); add(label4);
    add(tf1); add(tf2); add(tf3); add(tf4);
    add(b1); add(b2);
    }

    public void actionPerformed( ActionEvent ae ) {
    Object obj = ae.getSource( );

    String a = "5000", b = "6", c = "8";

    String st1 = tf1.getText();
    String st2 = tf2.getText();
    String st3 = tf3.getText();

    double p = Double.parseDouble(st1);
    double i = Double.parseDouble(st2);
    double n = Double.parseDouble(st3);

    double f = p*Math.pow(1+i/100, n);
    DecimalFormat formatter = new DecimalFormat("0.00");

    if (obj == b2){
    tf1.setText(String.valueOf(a));
    tf2.setText(String.valueOf(b));
    tf3.setText(String.valueOf(c));
    }
    else if (obj == b1)
    tf4.setText(formatter.format(f));
    }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Java Applets

    Code moved out of introductions section.

    Please explain what your problem is. What have you tried and what happened?

    Please edit your post and wrap your code with code tags:
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Java Applets

    Thanks for trying to help me. The problem I had was when I pressed the "Example" button, the three textfields, tf1, tf2 and tf3 did not show the values 5000, 6 and 8. I just realized that was becasue of the getText methods I had assigned did not let setText methods to be executed. I enclosed all of getText method with "Enter" button and put all setText method items enclosed in "Example" button and then I get the desired effect.

    BTW, is there a way to increase the height of a textfield?.

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