UIDefaults.LazyValue (Java SE 17 & JDK 17)
Description: declaration: module: java.desktop, package: javax.swing, class: UIDefaults, interface: LazyValue
Keywords: javax.swing.UIDefaults.LazyValue interface

Module java.desktop
Package javax.swing

# Interface UIDefaults.LazyValue

All Known Implementing Classes:
  `UIDefaults.LazyInputMap`, `UIDefaults.ProxyLazyValue`

Enclosing class:
  UIDefaults

public static interface UIDefaults.LazyValue
This class enables one to store an entry in the defaults table that isn't constructed until the first time it's looked up with one of the `getXXX(key)` methods. Lazy values are useful for defaults that are expensive to construct or are seldom retrieved. The first time a `LazyValue` is retrieved its "real value" is computed by calling `LazyValue.createValue()` and the real value is used to replace the `LazyValue` in the `UIDefaults` table. Subsequent lookups for the same key return the real value. Here's an example of a `LazyValue` that constructs a `Border`:

      Object borderLazyValue = new UIDefaults.LazyValue() {
          public Object createValue(UIDefaults table) {
              return new BorderFactory.createLoweredBevelBorder();
          }
      };

      uiDefaultsTable.put("MyBorder", borderLazyValue);

See Also:
  - `UIDefaults.get(java.lang.Object)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Object`
  `createValue(UIDefaults table)`
  Creates the actual value retrieved from the `UIDefaults` table.

- ## Method Details

  - ### createValue

    Object createValue(UIDefaults table)
    Creates the actual value retrieved from the `UIDefaults` table. When an object that implements this interface is retrieved from the table, this method is used to create the real value, which is then stored in the table and returned to the calling method.
    Parameters:
      `table` - a `UIDefaults` table
    Returns:
      the created `Object`