The JavaTM Tutorial

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Trail: Creating a GUI with JFC/Swing
Lesson: Laying Out Components Within a Container

## How to Use GridLayout

> Here's a snapshot of an application that uses a `GridLayout`.

> You can run GridLayoutDemo using JavaTM Web Start. Its code is in `GridLayoutDemo.java`.

> A `GridLayout` places components in a grid of cells. Each component takes all the available space within its cell, and each cell is exactly the same size. If you resize the GridLayoutDemo window, you'll see that the `GridLayout` changes the cell size so that the cells are as large as possible, given the space available to the container.

> Below is the code that creates the `GridLayout` and the components it manages. You can find the whole program in `GridLayoutDemo.java`.

> >     pane.setLayout(new GridLayout(0,2));

> >     pane.add(new JButton("Button 1"));
> >     pane.add(new JButton("Button 2"));
> >     pane.add(new JButton("Button 3"));
> >     pane.add(new JButton("Long-Named Button 4"));
> >     pane.add(new JButton("5"));

> The constructor tells the `GridLayout` class to create an instance that has two columns and as many rows as necessary.

### The GridLayout API

> [PENDING: This section will be converted to present its information in an API table.]

> The `GridLayout` class has two constructors:

> >     public GridLayout(int rows, int columns)
> >     public GridLayout(int rows, int columns,
> >                       int horizontalGap, int verticalGap)

> At least one of the `rows` and `columns` arguments must be nonzero; the `rows` argument has precedence over the `columns` argument. The `horizontalGap` and `verticalGap` arguments to the second constructor allow you to specify the number of pixels between cells. If you don't specify gaps, their values default to zero.

### Examples that Use GridLayout

> The following table lists some of the examples that use grid layout.

> Example | Where Described | Notes
> --- | --- | ---
> `GridLayoutDemo` | This page | Uses a 2-column grid.
> `ComboBoxDemo2` | How to Use Combo Boxes | One of many examples that use a 1x1 grid to make a component as large as possible.
> `LabelDemo` | How to Use Labels | Uses a 3-row grid.
> `DragPictureDemo` | How to Use Drag and Drop and Data Transfer | Uses a 4-row grid to present 12 components that display photographs.

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