Making a new frame and decorate it using the SpringLayout using SpringUtilities

Question

I am currently making a small application which i need the Spring Utilities class for, this class Extends 'JPanel' because it is a content pane, however i need to get the type of layout through a container, but only this class/frame is using the spring layout, which returns an EventQueue Exception (class = https://docs.oracle.com/javase/tutorial/uiswing/examples/layout/SpringGridProject/src/layout/SpringUtilities.java) The error:

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: No such child: 0
at java.awt.Container.getComponent(Unknown Source)
at dinges.Utilities.SpringUtilities.getConstraintsForCell(SpringUtilities.java:153)
at dinges.Utilities.SpringUtilities.makeCompactGrid(SpringUtilities.java:190)
at dinges.Containers.Addnew.<init>(Addnew.java:38)
at dinges.Containers.Listeners.AddListener.mousePressed(AddListener.java:27)
at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

I think that it is due to this

SpringUtilities.makeCompactGrid(this, 3, 2, 6, 6, 6, 6);

Because 'this' cannot be used, but i am unsure what to use then.

Code:

    package dinges.Containers;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SpringLayout;

import dinges.Utilities.SpringUtilities;

@SuppressWarnings("serial")
public class Addnew extends JPanel {

    /**
     *  > Add a text input for the following:
     *  > Id, Name, last name, current balance, and the state. But this has to be in order of the new Account.
     *  > we're just going to be using JTextFields, a JButton for saving and JLabels for writing what it is
     * 
     **/

    public Addnew() {
        // frame size is WIDTH =   280     ,      HEIGHT =     480
        SpringLayout layout = new SpringLayout();
        setLayout(layout);

        JButton save = new JButton("Save data");
        JTextField name = new JTextField(15);
        JTextField lastname = new JTextField(15);
        JComboBox<String> accounttype = new JComboBox<String>();
        JLabel label1 = new JLabel("First name: ", JLabel.TRAILING);
        JLabel label2 = new JLabel("Last name: ", JLabel.TRAILING);
        JLabel label3 = new JLabel("Account type: ", JLabel.TRAILING);
        label1.setLabelFor(name);
        label2.setLabelFor(lastname);
        label3.setLabelFor(accounttype);

        SpringUtilities.makeCompactGrid(this, 3, 2, 6, 6, 6, 6);




        add(label1);
        add(label2);
        add(label3);
        add(save);
        add(name);
        add(lastname);
        add(accounttype);
    }

}

Any help would be great, and thanks in advance.

score 1 · Answer 1 · answered Aug 04 '16 at 18:39

You need to add components to the container first. Then apply SpringUtilities.makeCompactGrid() method as it is trying to layout existing components. So just move makeCompactGrid() to the end of Addnew() constructor after all add() were executed.

As a side note, even though SpringLayout is very flexible, it is very low level as well, and usually used by GUI builds, and can be cumbersome to code by hand. See How to Use SpringLayout for more details:

SpringLayout is a very flexible layout manager that can emulate many of the features of other layout managers. SpringLayout is, however, very low-level and as such you really should only use it with a GUI builder, rather than attempting to code a spring layout manager by hand.

Making a new frame and decorate it using the SpringLayout using SpringUtilities

1 Answers1