If the container is wider than necessary for a row of components, the row is, by default, centered horizontally within the container. If the horizontal space in the container is too small to put all the components in one row, the FlowLayout class uses multiple rows. The component may not actually be this size depending on the size of the container it's in, or if the user re-sized the component manually. The FlowLayout class puts components in a row, sized at their preferred size. SetPreferredSize sets the preferred size. SetSize will resize the component to the specified size. The FlowLayout, GridBagLayout, and SpringLayout managers use the component's preferred size (the latter two depending on the constraints you set), but BorderLayout and GridLayout usually don't.If you specify new size hints for a component that's already visible, you need to invoke the revalidate method on it to make sure that its containment hierarchy is laid out again. However, if you are using a layout manager you can provide hints to the layout manager using the setXXXSize() methods like setPreferredSize() and setMinimumSize() etc.Īnd be sure that the component's container uses a layout manager that respects the requested size. Run-Time: It is a little bit trickier than the above method. Design-Time: It is the easiest way to set the size of the FlowLayoutPanel as shown in the following steps: Step 2: Next, drag and drop the FlowLayoutPanel control from the toolbox to the form as shown in the below image: 2. SetSize() or setBounds() can be used when no layout manager is being used. You can set this property in two different ways: 1. The buttons stays at one line, making the JPanel too wide for me. However, whichever JPanel to set with either size, maximumSize, preferred size it doesn't work. Generally, setPreferredSize() will lay out the components as expected if a layout manager is present most layout managers work by getting the preferred (as well as minimum and maximum) sizes of their components, then using setSize() and setLocation() to position those components according to the layout's rules.įor example, a BorderLayout tries to make the bounds of its "north" region equal to the preferred size of its north component-they may end up larger or smaller than that, depending on the size of the JFrame, the size of the other components in the layout, and so on. The problem is, as JPanel3 uses FlowLayout, I tried to set it with a maximum width so that the buttons auto change line when there are too many. You also must call setSize() if you've got components inside a parent without a layout manager. The setSize() method probably won't do anything if the component's parent is using a layout manager the places this will typically have an effect would be on top-level components ( JFrames and JWindows) and things that are inside of scrolled panes. setPreferredSize() (also its related setMinimumSize and setMaximumSize) - use when a parent layout manager exists.setSize() - use when a parent layout manager does not exist.Usage depends on whether the component's parent has a layout manager or not.
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