Java LayoutManagers are used to save you the effort of manually putting Components where you want them on a Container. Even more useful is the fact that a LayoutManager object will handle repositioning your objects whenever the Container is resized (which is a colossal waste of time when you do it yourself).
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A layout manager is an object that is used to organize components in a container.And it is an interface in the java class libraries that describes how a container and a layout manager communicate. There are 5 main Layouts in java :------ 1. FlowLayout 2. BorderLayout 3. CardLayout 4. GridLayout 5. GridbagLayout
The function of a layout manager is to help the java programmer with aligning and positioning components inside the AWT or Java Swing components like a Frame or a Panel. Without the layout managers the programmer will have to position these components one by one manually which is very difficult and may also result in poor layout response when the user re-sizes the UI window. Some of the commonly used layout managers are: a. BorderLayout b. GridLayout c. GridBagLayout d. Etc
java exception
jFM is a java file manager. It is used to access the file system.
Defines the security policy for each application .Every Java Application can have its own Security manager.