Why I should use a JPanel?

jpanel vs jframe
jpanel layout
jbutton
jpanel setlayout
add jpanel to jframe
jpanel size
jpanel java 8
jpanel gridlayout

What's the difference between:

public class Test {

    public static void main(String[] args) {
        JButton button= new JButton("1");
        button.setVisible(true);
        JPanel panel= new JPanel();
        panel.add(button);
        panel.setVisible(true);
        JFrame frame = new JFrame();
        frame.add(panel);
        frame.setVisible(true);
        frame.pack();

    }
}

and

public class Test {

    public static void main(String[] args) {
        JButton button= new JButton("1");
        button.setVisible(true);
        JFrame frame = new JFrame();
        frame.add(button);
        frame.setVisible(true);
        frame.pack();

    }
}

I know that a JPanel is a container for GUI components but I really don't see the utility of use it. Certainly I'm very wrong but I'm starting with Swing, so... Why I should use a JPanel? What's really the purpose?


JPanel basic tutorial and examples, The JPanel class provides general-purpose containers for lightweight or SpringLayout , you will typically use the one-argument add method, like this:. The API in the JPanel class itself is minimal. The methods you are most likely to invoke on a JPanel object are those it inherits from its superclasses — JComponent, Container, and Component. The following tables list the API you are most likely to use, with the exception of methods related to borders and layout hints.


There is basically no visual difference in your two examples, but the UI is too poor for exhibiting a difference. A JPanel is exactly what a panel is in real life, something used to display things inside it. It is generally used to contains different elements that you want to display in a given layout.

How to Use Panels (The Java™ Tutorials > Creating a GUI With JFC , Java Swing | JPanel with examples. JPanel, a part of Java Swing package, is a container that can store a group of components. The main task of JPanel is to organize components, various layouts can be set in JPanel which provide better organisation of components, however it does not have a title bar. 2) Use a CardLayout as shown in this answer. 3) implements Key Listener What? That would not even compile! For better help sooner, edit to add a minimal reproducible example or Short, Self Contained, Correct Example. 4) public class Menu extends JPanel.. Since there is an AWT class named Menu, this is a poor choice. Choose class names carefully.


The purpose is to group components together.

Look at this web page for example. You could imagine a center panel with the question and answers laid out vertically, a right panel containing yet other panels: one for the blog, one for the job announcement, one for the related questions, and finally a south panel for the footer.

The footer panel can be reused in other pages than question pages.

The layout of the page as a whole is easier to understand and implement if you divide it into independant panels.

Java Swing, Now, to use a JPanel in our java source code, we need to create an object of JPanel by calling its constructor JPanel (), after a call to this constructor, a blank panel� You should only use a JFrame or JDialog (or other top level container) to display other containers (like JPanel). You should endeavor to use JPanel as your base line container for all your forms, nesting other panels and controls into as you see fit. This allows you the flexibility to show your panel/form in any top level container you like.


You can put more than one JPanel in the JFrame. JPanel is a conainer for you other components and can grouping it by logical features.

JPanel vs JFrame, When we need to construct just one object from a subclass, we don't really even need to name the subclass. Instead, we can use special Java syntax to construct � Solving Common Component Problems should help you with this. Check whether repaint is invoked on your component whenever its appearance needs to be updated. Problem: My component's foreground shows up, but its background is invisible. The result is that one or more components directly behind my component are unexpectedly visible.


You can use a JPanel to create a reusable building block of your user interface and maintain a single point of maintenance for all instances of it. Let's say you would create a JFrame containing a diff view for two texts. The left and right view are lets say identical twins. It is way easier to create a panel twice and to add these two panels on the frame instead of adding all subsequent components twice into your frame directly.

Whenever you now have to change the view, let's say you want to add another button, or whatever you can do it at your panel and both - the left and right view will contain the changes immediately.

View Basics: JFrames and JPanels, We will use a label to write the traditional first program: the "Hello World" program . Creating a Label: JLabel L = new JLabel("Text")� Question: If I want to design an applet for the web browser in which I can drag my background image around by clicking and holding my mouse button, is it better to use a JPanel or a JFrame. The app should be quite simple and only use another database communication class, along side with a UI class for buttons and text areas.


Containers: JFrame and JPanel, A JPanel can contain other components, and it can in turn be contained in Which one you should use depends on what type of LayoutManager is being used� Swing containers other than JPanel and content panes generally provide API that you should use instead of the add method. For example, instead of adding a component directly to a scroll pane (or, actually, to its viewport), you either specify the component in the JScrollPane constructor or use setViewportView. Because of specialized API like


Java Programming: Section 7.2, This video shows an example of a JFrame that controls the behavior of a jPanel. Whenever we Duration: 17:36 Posted: Feb 25, 2017 Although it is possible to do without a layout manager, you should use a layout manager if at all possible. A layout manager makes it easier to adjust to look-and-feel-dependent component appearances, to different font sizes, to a container's changing size, and to different locales.


Java Basics - GUI JPanel controlled from JFrame, There are so many methods that can be used for JPanel, which it In Java Programming, in order to create a panel, you need to invoke a�