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## javax.swing
Class GroupLayout.Group

    java.lang.Object
      javax.swing.GroupLayout.Group

Direct Known Subclasses:
  GroupLayout.ParallelGroup, GroupLayout.SequentialGroup

Enclosing class:
  GroupLayout

    public abstract class GroupLayout.Group

extends Object

`Group` provides the basis for the two types of operations supported by `GroupLayout`: laying out components one after another (`SequentialGroup`) or aligned (`ParallelGroup`). `Group` and its subclasses have no public constructor; to create one use one of `createSequentialGroup` or `createParallelGroup`. Additionally, taking a `Group` created from one `GroupLayout` and using it with another will produce undefined results.

Various methods in `Group` and its subclasses allow you to explicitly specify the range. The arguments to these methods can take two forms, either a value greater than or equal to 0, or one of `DEFAULT_SIZE` or `PREFERRED_SIZE`. A value greater than or equal to `0` indicates a specific size. `DEFAULT_SIZE` indicates the corresponding size from the component should be used. For example, if `DEFAULT_SIZE` is passed as the minimum size argument, the minimum size is obtained from invoking `getMinimumSize` on the component. Likewise, `PREFERRED_SIZE` indicates the value from `getPreferredSize` should be used. The following example adds `myComponent` to `group` with specific values for the range. That is, the minimum is explicitly specified as 100, preferred as 200, and maximum as 300.

       group.addComponent(myComponent, 100, 200, 300);

The following example adds `myComponent` to `group` using a combination of the forms. The minimum size is forced to be the same as the preferred size, the preferred size is determined by using `myComponent.getPreferredSize` and the maximum is determined by invoking `getMaximumSize` on the component.

       group.addComponent(myComponent, GroupLayout.PREFERRED_SIZE,
                 GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE);

Unless otherwise specified all the methods of `Group` and its subclasses that allow you to specify a range throw an `IllegalArgumentException` if passed an invalid range. An invalid range is one in which any of the values are < 0 and not one of `PREFERRED_SIZE` or `DEFAULT_SIZE`, or the following is not met (for specific values): `min` <= `pref` <= `max`.

Similarly any methods that take a `Component` throw a `NullPointerException` if passed `null` and any methods that take a `Group` throw an `IllegalArgumentException` if passed `null`.

Since:
  1.6
See Also:
  `GroupLayout.createSequentialGroup()`, `GroupLayout.createParallelGroup()`

Method Summary
`GroupLayout.Group` | `addComponent(Component component)` Adds a `Component` to this `Group`.
`GroupLayout.Group` | `addComponent(Component component, int min, int pref, int max)` Adds a `Component` to this `Group` with the specified size.
`GroupLayout.Group` | `addGap(int size)` Adds a rigid gap to this `Group`.
`GroupLayout.Group` | `addGap(int min, int pref, int max)` Adds a gap to this `Group` with the specified size.
`GroupLayout.Group` | `addGroup(GroupLayout.Group group)` Adds a `Group` to this `Group`.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### addGroup

    public GroupLayout.Group addGroup(GroupLayout.Group group)

  Adds a `Group` to this `Group`.

  Parameters:
    `group` - the `Group` to add
  Returns:
    this `Group`

### addComponent

    public GroupLayout.Group addComponent(Component component)

  Adds a `Component` to this `Group`.

  Parameters:
    `component` - the `Component` to add
  Returns:
    this `Group`

### addComponent

    public GroupLayout.Group addComponent(Component component,
                                          int min,
                                          int pref,
                                          int max)

  Adds a `Component` to this `Group` with the specified size.

  Parameters:
    `component` - the `Component` to add
    `min` - the minimum size or one of `DEFAULT_SIZE` or `PREFERRED_SIZE`
    `pref` - the preferred size or one of `DEFAULT_SIZE` or `PREFERRED_SIZE`
    `max` - the maximum size or one of `DEFAULT_SIZE` or `PREFERRED_SIZE`
  Returns:
    this `Group`

### addGap

    public GroupLayout.Group addGap(int size)

  Adds a rigid gap to this `Group`.

  Parameters:
    `size` - the size of the gap
  Returns:
    this `Group`
  Throws:
    `IllegalArgumentException` - if `size` is less than `0`

### addGap

    public GroupLayout.Group addGap(int min,
                                    int pref,
                                    int max)

  Adds a gap to this `Group` with the specified size.

  Parameters:
    `min` - the minimum size of the gap
    `pref` - the preferred size of the gap
    `max` - the maximum size of the gap
  Returns:
    this `Group`
  Throws:
    `IllegalArgumentException` - if any of the values are less than `0`

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