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Thread: Applet Calculator

  1. #1
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    Default Applet Calculator

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

    public class Compute extends java.applet.Applet implements ActionListener{
    char sol;
    String s1, s2;
    double d1,d2,d3;
    String str=" ";

    Label lbl=new Label();

    Button one, two, three, four, five, six, seven, eight, nine, zero, dot, plus, min, div, mult, eq;
    Button cmd= new Button("Clear");

    public void init() {
    setLayout(null);
    setBackground(Color.BLACK);

    lbl=new Label();
    lbl.setBackground(Color.GRAY);
    add(lbl);
    lbl.setBounds(20, 20, 100, 25);

    one=new Button("1");
    add(one);
    one.setBounds(20, 50, 25, 25);
    one.addActionListener(this);

    two=new Button("2");
    add(two);
    two.setBounds(45, 50, 25, 25);
    two.addActionListener(this);

    three=new Button("3");
    add(three);
    three.setBounds(70, 50, 25, 25);
    three.addActionListener(this);

    four=new Button("4");
    add(four);
    four.setBounds(20, 75, 25, 25);
    four.addActionListener(this);

    five=new Button("5");
    add(five);
    five.setBounds(45, 75, 25, 25);
    five.addActionListener(this);

    six=new Button("6");
    add(six);
    six.setBounds(70, 75, 25, 25);
    six.addActionListener(this);

    seven=new Button("7");
    add(seven);
    seven.setBounds(20, 100, 25, 25);
    seven.addActionListener(this);

    eight=new Button("8");
    add(eight);
    eight.setBounds(45, 100, 25, 25);
    eight.addActionListener(this);

    nine=new Button("9");
    add(nine);
    nine.setBounds(70, 100, 25, 25);
    nine.addActionListener(this);

    zero=new Button("0");
    add(zero);
    zero.setBounds(20, 125, 25, 25);
    zero.addActionListener(this);

    plus=new Button("+");
    add(plus);
    plus.setBounds(95, 50, 25, 25);
    plus.addActionListener(this);

    min=new Button("-");
    add(min);
    min.setBounds(95, 75, 25, 25);
    min.addActionListener(this);

    mult=new Button("*");
    add(mult);
    mult.setBounds(95, 100, 25, 25);
    mult.addActionListener(this);

    div=new Button("/");
    add(div);
    div.setBounds(95, 125, 25, 25);
    div.addActionListener(this);

    dot=new Button(".");
    add(dot);
    dot.setBounds(45, 125, 25, 25);
    dot.addActionListener(this);

    eq=new Button("=");
    add(eq);
    eq.setBounds(70, 125, 25, 25);
    eq.addActionListener(this);

    add(cmd);
    cmd.setBounds(20, 150, 50, 20);
    cmd.addActionListener(this);
    }

    public void paint(Graphics g) {

    }
    public void actionPerformed(ActionEvent x)
    {
    if(x.getSource()==one)
    str=str+"1";
    lbl.setText(str);
    if(x.getSource()==two)
    str=str+"2";
    lbl.setText(str);
    if(x.getSource()==three)
    str=str+"3";
    lbl.setText(str);
    if(x.getSource()==zero)
    str=str+"0";
    lbl.setText(str);
    if(x.getSource()==four)
    str=str+"4";
    lbl.setText(str);
    if(x.getSource()==five)
    str=str+"5";
    lbl.setText(str);
    if(x.getSource()==six)
    str=str+"6";
    lbl.setText(str);
    if(x.getSource()==seven)
    str=str+"7";
    lbl.setText(str);
    if(x.getSource()==eight)
    str=str+"8";
    lbl.setText(str);
    if(x.getSource()==nine)
    str=str+"9";
    lbl.setText(str);
    if(x.getSource()==dot)
    str=str+".";
    lbl.setText(str);

    if(x.getSource()==plus)
    s1=lbl.getText();
    str=" ";
    lbl.setText(str);
    d1=Double.parseDouble(s1.trim());
    sol='+';

    if(x.getSource()==min)
    s1=lbl.getText();
    str=" ";
    lbl.setText(str);
    d1=Double.parseDouble(s1.trim());
    sol='-';

    if(x.getSource()==mult)
    s1=lbl.getText();
    str=" ";
    lbl.setText(str);
    d1=Double.parseDouble(s1.trim());
    sol='*';

    if(x.getSource()==div)
    s1=lbl.getText();
    str=" ";
    lbl.setText(str);
    d1=Double.parseDouble(s1.trim());
    sol='/';

    if(x.getSource()==eq)
    {

    s2=lbl.getText();
    d2=Double.parseDouble(s2.trim());
    String s3=" ";
    switch(sol)
    {
    case '+':
    d3=d1+d2;
    break;
    case '-':
    d3=d1-d2;
    break;
    case '*':
    d3=d1*d2;
    case '/':
    d3=d1/d2;
    break;
    }
    s3=Double.toString(d3);
    lbl.setText(s3);


    if(x.getSource()==cmd)
    {
    s1=" ";
    s2=" ";
    d1=0;
    d2=0;
    d3=0;
    lbl.setText(" ");
    }


    }//end of eq
    }//end of actionPerformed
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Applet Calculator

    Please edit your post and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.

    Did you have any questions?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Applet Calculator

    What?

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Applet Calculator

    What's on second base.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: Applet Calculator

    Can I have a sample format?

  6. #6
    Super Moderator Norm's Avatar
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    Default Re: Applet Calculator

    Format of what? There are tons of properly formatted code on the forum. Take a look.
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: Applet Calculator

    What do you mean by?
    Please edit your post and wrap your code with
    <YOUR CODE HERE>
    to get highlighting and preserve formatting.

    --- Update ---

    import java.awt.*;
    import java.applet.*;
    import java.awt.event.*;
     
    public class Compute extends java.applet.Applet implements ActionListener{
    char sol;
    String s1, s2;
    double d1,d2,d3;
    String str=" ";
     
    Label lbl=new Label();
     
    Button one, two, three, four, five, six, seven, eight, nine, zero, dot, plus, min, div, mult, eq;
    Button cmd= new Button("Clear");
     
    public void init() {
    setLayout(null);
    setBackground(Color.BLACK);
     
    lbl=new Label();
    lbl.setBackground(Color.GRAY);
    add(lbl);
    lbl.setBounds(20, 20, 100, 25);
     
    one=new Button("1");
    add(one);
    one.setBounds(20, 50, 25, 25);
    one.addActionListener(this);
     
    two=new Button("2");
    add(two);
    two.setBounds(45, 50, 25, 25);
    two.addActionListener(this);
     
    three=new Button("3");
    add(three);
    three.setBounds(70, 50, 25, 25);
    three.addActionListener(this);
     
    four=new Button("4");
    add(four);
    four.setBounds(20, 75, 25, 25);
    four.addActionListener(this);
     
    five=new Button("5");
    add(five);
    five.setBounds(45, 75, 25, 25);
    five.addActionListener(this);
     
    six=new Button("6");
    add(six);
    six.setBounds(70, 75, 25, 25);
    six.addActionListener(this);
     
    seven=new Button("7");
    add(seven);
    seven.setBounds(20, 100, 25, 25);
    seven.addActionListener(this);
     
    eight=new Button("8");
    add(eight);
    eight.setBounds(45, 100, 25, 25);
    eight.addActionListener(this);
     
    nine=new Button("9");
    add(nine);
    nine.setBounds(70, 100, 25, 25);
    nine.addActionListener(this);
     
    zero=new Button("0");
    add(zero);
    zero.setBounds(20, 125, 25, 25);
    zero.addActionListener(this);
     
    plus=new Button("+");
    add(plus);
    plus.setBounds(95, 50, 25, 25);
    plus.addActionListener(this);
     
    min=new Button("-");
    add(min);
    min.setBounds(95, 75, 25, 25);
    min.addActionListener(this);
     
    mult=new Button("*");
    add(mult);
    mult.setBounds(95, 100, 25, 25);
    mult.addActionListener(this);
     
    div=new Button("/");
    add(div);
    div.setBounds(95, 125, 25, 25);
    div.addActionListener(this);
     
    dot=new Button(".");
    add(dot);
    dot.setBounds(45, 125, 25, 25);
    dot.addActionListener(this);
     
    eq=new Button("=");
    add(eq);
    eq.setBounds(70, 125, 25, 25);
    eq.addActionListener(this);
     
    add(cmd);
    cmd.setBounds(20, 150, 50, 20);
    cmd.addActionListener(this);
    }
     
    public void paint(Graphics g) {
     
    }
    public void actionPerformed(ActionEvent x)
    {
    if(x.getSource()==one)
    str=str+"1";
    lbl.setText(str);
    if(x.getSource()==two)
    str=str+"2";
    lbl.setText(str);
    if(x.getSource()==three)
    str=str+"3";
    lbl.setText(str);
    if(x.getSource()==zero)
    str=str+"0";
    lbl.setText(str);
    if(x.getSource()==four)
    str=str+"4";
    lbl.setText(str);
    if(x.getSource()==five)
    str=str+"5";
    lbl.setText(str);
    if(x.getSource()==six)
    str=str+"6";
    lbl.setText(str);
    if(x.getSource()==seven)
    str=str+"7";
    lbl.setText(str);
    if(x.getSource()==eight)
    str=str+"8";
    lbl.setText(str);
    if(x.getSource()==nine)
    str=str+"9";
    lbl.setText(str);
    if(x.getSource()==dot)
    str=str+".";
    lbl.setText(str);
     
    if(x.getSource()==plus)
    s1=lbl.getText();
    str=" ";
    lbl.setText(str);
    d1=Double.parseDouble(s1.trim());
    sol='+';
     
    if(x.getSource()==min)
    s1=lbl.getText();
    str=" ";
    lbl.setText(str);
    d1=Double.parseDouble(s1.trim());
    sol='-';
     
    if(x.getSource()==mult)
    s1=lbl.getText();
    str=" ";
    lbl.setText(str);
    d1=Double.parseDouble(s1.trim()); 
    sol='*';
     
    if(x.getSource()==div)
    s1=lbl.getText();
    str=" ";
    lbl.setText(str);
    d1=Double.parseDouble(s1.trim()); 
    sol='/';
     
    if(x.getSource()==eq)
    {
     
    s2=lbl.getText();
    d2=Double.parseDouble(s2.trim());
    String s3=" ";	
    switch(sol)
    {
    case '+':
    d3=d1+d2;
    break;
    case '-':
    d3=d1-d2;
    break;
    case '*':
    d3=d1*d2;
    case '/':
    d3=d1/d2;
    break;
    }
    s3=Double.toString(d3);
    lbl.setText(s3); 
     
     
    if(x.getSource()==cmd)
    {
    s1=" ";
    s2=" ";
    d1=0;
    d2=0;
    d3=0;
    lbl.setText(" ");
    }
     
     
    }//end of eq
    }//end of actionPerformed
    }


    --- Update ---

    When I click on the buttons nothing displays in the Label.

  8. #8
    Super Moderator Norm's Avatar
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    Default Re: Applet Calculator

    The posted code is very hard to read because of its formatting.
    The posted code needs to be properly formatted. Statements nested inside {}s need to be indented 3-4 spaces.
    The statements should NOT all start in the left column.
    If you don't understand my answer, don't ignore it, ask a question.

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