getPreferredSize : Java Glossary

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getPreferredSize
Each component has four sizes (height,width).

These methods often return 0,0 as the size. The reason is, they rely on the underlying GUI (Graphic User Interface) to compute the size, and if there in no peer object yet, there is no hook to ask the native GUI. See addNotify.

If you want to manually control any of these sizes, e.g. to create a fixed size Component, override all three methods: Component. getMinimumSize(), Component. getMaximumSize() and Component. getPreferredSize().

In Java version 1.5 or later, alternatively you can use Component. setMinimumSize, Component. setMaximumSize, and Component. setPreferredSize instead of overriding getXXXXsize methods.

Learning More

Oracle’s Javadoc on getMinumimSize class : available:
Oracle’s Javadoc on getMaximumSize class : available:
Oracle’s Javadoc on getPreferredSize class : available:
Oracle’s Javadoc on getSize class : available:
Oracle’s Javadoc on setMinumimSize class : available:
Oracle’s Javadoc on setMaximumSize class : available:
Oracle’s Javadoc on setPreferredSize class : available:
Oracle’s Javadoc on setSize class : available:
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JComponent
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