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Thread: What does this mean????

  1. #1
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    Default What does this mean????

    java.lang.NoSuchMethodError: main
    Exception in thread "main"
    Process completed.


    (I made a main method)

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    Default Re: What does this mean????

    You're going to have to post the actual code (in the form of an SSCCE), exactly how you're trying to run it, and the exact error message. Java does not see a main method in whatever class you're trying to run.
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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    Maltese (July 3rd, 2012)

  4. #3
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    Default Re: What does this mean????

    package GUI;

    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    import java.util.*;

    public class Testing extends JPanel implements MouseListener{

    private JTextField textField;
    private JButton button;

    public Testing(){
    super.setLayout(new BorderLayout());

    this.build();
    }

    public void build(){
    JPanel center = new JPanel(new FlowLayout(FlowLayout.CENTER));
    super.add(center, BorderLayout.CENTER);

    textField = new JTextField();
    center.add(textField);

    this.button = new JButton("On-Screen Keyboard");
    button.setSize(new Dimension(200, 20));
    center.add(button);
    button.addMouseListener(this);
    }

    public void mouseClicked(MouseEvent e)
    {
    if (e.getSource() == button)
    {
    CharacterPadSpace b = new CharacterPadSpace(textField);
    }
    }
    public void mouseEntered(MouseEvent e)
    {
    // if (e.getSource() == a){ System.out.println("Test1");}
    }
    public void mouseExited(MouseEvent e)
    {
    //if (e.getSource() == a){ System.out.println("Test1");}
    }
    public void mousePressed(MouseEvent e)
    {
    //if (e.getSource() == a){ System.out.println("Test1");}
    }
    public void mouseReleased(MouseEvent e)
    {
    //i/f (e.getSource() == a){ System.out.println("Test1");}
    }

    public static void main (String [] args)
    {
    JFrame f = new JFrame();
    f.setLocation(50, 50);
    f.setSize(470, 500);
    f.setVisible(true);
    Testing m = new Testing();
    f.add(m);
    }
    }


    /**
    * @(#)CharacterPadSpace.java
    *
    *
    * @Jamie
    * @version 1.00 2012/6/3
    */
    package GUI;

    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    import java.util.*;

    public class CharacterPadSpace extends JFrame implements MouseListener
    {
    private JButton a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, space, bspace, capsLock;
    private JTextField myTextField;
    private JButton zero, one, two, three, four, five, six, seven, eight, nine;
    private boolean capsPressed = false;

    public CharacterPadSpace(JTextField myTextField)
    {
    super.setLayout(new BorderLayout());
    this.myTextField = new JTextField("");
    super.setPreferredSize(new Dimension(200,500));
    this.myTextField = myTextField;
    super.setLocation(50, 50);
    super.setSize(470, 500);
    super.setVisible(true);
    this.build();
    }

    public void build()
    {
    JPanel north = new JPanel(new FlowLayout(FlowLayout.CENTER));
    super.add(north, BorderLayout.NORTH);
    north.setBorder(BorderFactory.createEmptyBorder(20 , 0, 0, 0));

    JPanel center = new JPanel(new GridBagLayout());
    super.add(center, BorderLayout.CENTER);
    center.setBackground(new Color(255, 255, 240));

    JPanel south = new JPanel();
    super.add(south, BorderLayout.SOUTH);
    south.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));

    JPanel east = new JPanel();
    super.add(east, BorderLayout.EAST);
    east.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));

    JPanel west = new JPanel();
    super.add(west, BorderLayout.WEST);
    west.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));

    GridBagConstraints cc = new GridBagConstraints();
    a = new JButton("a");
    a.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc.ipadx = 20;
    cc.ipady = 20;
    cc.insets = new Insets(0,3,0,3);
    cc.gridx = 0;
    cc.gridy = 0;
    center.add(a, cc);

    b = new JButton("b");
    b.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc.weightx = 0.5;
    cc.insets = new Insets(0,0,0,3);
    cc.gridx = 1;
    cc.gridy = 0;
    center.add(b, cc);

    c = new JButton("c");
    c.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc.insets = new Insets(0,0,0,3);
    cc.weightx = 0.5;
    cc.gridx = 2;
    cc.gridy = 0;
    center.add(c, cc);

    d = new JButton("d");
    d.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc.weightx = 0.5;
    cc.insets = new Insets(0,0,0,3);
    cc.gridx = 3;
    cc.gridy = 0;
    center.add(d, cc);

    e = new JButton("e");
    e.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc.weightx = 0.5;
    cc.insets = new Insets(0,0,0,3);
    cc.gridx = 4;
    cc.gridy = 0;
    center.add(e, cc);

    bspace = new JButton("<----");
    bspace.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc.weightx = 0.5;
    cc.gridwidth = 2;
    cc.insets = new Insets(0,3,0,3);
    cc.fill = GridBagConstraints.HORIZONTAL;
    cc.gridx = 5;
    cc.gridy = 0;
    center.add(bspace, cc);

    GridBagConstraints cc2 = new GridBagConstraints();

    cc2.ipadx = 20;
    cc2.ipady = 20;


    f = new JButton("f");
    f.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,3,0,0);
    cc2.gridx = 0;
    cc2.gridy = 1;
    center.add(f, cc2);

    g = new JButton("g");
    g.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 1;
    cc2.gridy = 1;
    center.add(g, cc2);

    h = new JButton("h");
    h.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 2;
    cc2.gridy = 1;
    center.add(h, cc2);

    i = new JButton("i");
    i.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 3;
    cc2.gridy = 1;
    center.add(i, cc2);

    j = new JButton("j");
    j.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 4;
    cc2.gridy = 1;
    center.add(j, cc2);

    k = new JButton("k");
    k.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 5;
    cc2.gridy = 1;
    center.add(k, cc2);

    l = new JButton("l");
    l.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 6;
    cc2.gridy = 1;
    center.add(l, cc2);

    m = new JButton("m");
    m.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 1;
    cc2.insets = new Insets(4,3,0,3);
    cc2.gridx = 0;
    cc2.gridy = 2;
    center.add(m, cc2);

    n = new JButton("n");
    n.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 1;
    cc2.gridy = 2;
    center.add(n, cc2);

    o = new JButton("o");
    o.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 2;
    cc2.gridy = 2;
    center.add(o, cc2);

    p = new JButton("p");
    p.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 3;
    cc2.gridy = 2;
    center.add(p, cc2);

    q = new JButton("q");
    q.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 4;
    cc2.gridy = 2;
    center.add(q, cc2);

    r = new JButton("r");
    r.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 5;
    cc2.gridy = 2;
    center.add(r, cc2);

    s = new JButton("s");
    s.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 6;
    cc2.gridy = 2;
    center.add(s, cc2);

    t = new JButton("t");
    t.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,3,0,3);
    cc2.gridx = 0;
    cc2.gridy = 3;
    center.add(t, cc2);

    u = new JButton("u");
    u.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 1;
    cc2.gridy = 3;
    center.add(u, cc2);

    v = new JButton("v");
    v.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 2;
    cc2.gridy = 3;
    center.add(v, cc2);

    w = new JButton("w");
    w.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 3;
    cc2.gridy = 3;
    center.add(w, cc2);

    x = new JButton("x");
    x.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 4;
    cc2.gridy = 3;
    center.add(x, cc2);

    y = new JButton("y");
    y.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 5;
    cc2.gridy = 3;
    center.add(y, cc2);

    z = new JButton("z");
    z.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 6;
    cc2.gridy = 3;
    center.add(z, cc2);

    capsLock = new JButton("caps lock");
    capsLock.setFont(new Font("Lucida Sans Regular", Font.ITALIC, 18));
    cc2.gridwidth = 2;
    cc2.gridheight = 2;
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,3,0,3);
    cc2.gridx = 0;
    cc2.gridy = 4;
    cc2.ipadx = 40;
    cc2.ipady = 81;
    center.add(capsLock, cc2);

    zero = new JButton("0");
    zero.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.gridwidth = 1;
    cc2.gridheight = 1;
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 2;
    cc2.gridy = 4;
    cc2.ipadx = 20;
    cc2.ipady = 20;
    center.add(zero, cc2);

    one = new JButton("1");
    one.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 3;
    cc2.gridy = 4;
    center.add(one, cc2);

    two = new JButton("2");
    two.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 4;
    cc2.gridy = 4;
    center.add(two, cc2);

    three = new JButton("3");
    three.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 5;
    cc2.gridy = 4;
    center.add(three, cc2);

    four = new JButton("4");
    four.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 6;
    cc2.gridy = 4;
    center.add(four, cc2);

    five = new JButton("5");
    five.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 2;
    cc2.gridy = 5;
    center.add(five, cc2);

    six = new JButton("6");
    six.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 3;
    cc2.gridy = 5;
    center.add(six, cc2);

    seven = new JButton("7");
    seven.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 4;
    cc2.gridy = 5;
    center.add(seven, cc2);

    eight = new JButton("8");
    eight.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 5;
    cc2.gridy = 5;
    center.add(eight, cc2);

    nine = new JButton("9");
    nine.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,3);
    cc2.gridx = 6;
    cc2.gridy = 5;
    center.add(nine, cc2);

    space = new JButton(" ");
    space.setFont(new Font("Lucida Sans Regular", Font.PLAIN, 20));
    cc2.weightx = 0.5;
    cc2.insets = new Insets(4,0,0,0);
    cc2.gridwidth = 5;
    cc2.gridheight = 1;
    cc2.ipadx = 222;
    cc2.ipady = 20;
    cc2.gridx = 1;
    cc2.gridy = 6;
    center.add(space, cc2);


    zero.addMouseListener(this);one.addMouseListener(t his);two.addMouseListener(this);
    three.addMouseListener(this);four.addMouseListener (this);five.addMouseListener(this);
    six.addMouseListener(this);seven.addMouseListener( this);eight.addMouseListener(this);
    nine.addMouseListener(this);capsLock.addMouseListe ner(this);


    a.addMouseListener(this);b.addMouseListener(this); c.addMouseListener(this);d.addMouseListener(this);
    e.addMouseListener(this);f.addMouseListener(this); g.addMouseListener(this);h.addMouseListener(this);
    i.addMouseListener(this);j.addMouseListener(this); k.addMouseListener(this);l.addMouseListener(this);
    m.addMouseListener(this);n.addMouseListener(this); o.addMouseListener(this);p.addMouseListener(this);
    q.addMouseListener(this);r.addMouseListener(this); s.addMouseListener(this);t.addMouseListener(this);
    u.addMouseListener(this);v.addMouseListener(this); w.addMouseListener(this);x.addMouseListener(this);
    bspace.addMouseListener(this);space.addMouseListen er(this);z.addMouseListener(this);y.addMouseListen er(this);
    }

    public void mouseClicked(MouseEvent e)
    {
    if (e.getSource() == capsLock)
    {
    capsPressed = true;
    }
    else if (e.getSource() == a)
    {
    if (capsPressed){
    myTextField.setText( myTextField.getText() + "A");
    capsPressed = false;
    }else if(capsPressed == false)
    {
    myTextField.setText( myTextField.getText() + "a");
    capsPressed = false;
    }
    }
    }
    public void mouseEntered(MouseEvent e)
    {
    // if (e.getSource() == a){ System.out.println("Test1");}
    }
    public void mouseExited(MouseEvent e)
    {
    //if (e.getSource() == a){ System.out.println("Test1");}
    }
    public void mousePressed(MouseEvent e)
    {
    //if (e.getSource() == a){ System.out.println("Test1");}
    }
    public void mouseReleased(MouseEvent e)
    {
    //i/f (e.getSource() == a){ System.out.println("Test1");}
    }

    /* public static void main(String [] args)
    {
    JFrame f = new JFrame();
    f.add(new CharacterPadSpace(new JTextField()));

    f.setLocation(50, 50);
    f.setSize(470, 500);
    f.setVisible(true);

    }*/
    }

    I am trying to run the first clsss ... Thanks

  5. #4
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    Default Re: What does this mean????

    The CharacterPadSpace works silky smooth and when compiling everything seems ok

  6. #5
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    Default Re: What does this mean????

    That is not an SSCCE. And when posting code, please use the code tags- unformatted code is really hard to read.

    Why class is your main method in? What class are you trying to run? Boil your problem down to an SSCCE, and we'll go from there.
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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  7. #6
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    Default Re: What does this mean????

    The CharacterPadSpace works silky smooth and when compiling everything seems ok

  8. #7
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    Default Re: What does this mean????

    What is SSCCE cause I am trying to click on what you sent me that hyperlink marked in blue and nothing is loaded

  9. #8
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: What does this mean????

    Sorry, their site must be down. But an SSCCE is a short, self-contained, compilable example. Basically, you should narrow your problem down to as few lines as possible while still showing your error- in your case, a basic Hello World would do, without a gui, which shows the relationship between your classes, where your main method is, etc. Please don't forget the code tags.
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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  10. #9
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    Default Re: What does this mean????

    I am trying to run the Testing class ... but there is nothing when it comes to compiling its a run time error and the problem I think is the Testing class because the other works smooth

  11. #10
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    Default Re: What does this mean????

    Like I said- what class is your main method in? What class are you trying to run? Exactly how are you trying to run it?

    An SSCCE would help answer all of these questions.
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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