BeanContext Support : Java Beans « Language Basics « Java
BeanContext Support
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import java.beans.beancontext.BeanContextChildSupport;
import java.beans.beancontext.BeanContextSupport;
/**
* A test program that adds a bean to a beancontext, and reports on various
* aspects of the context's membership state. This program also shows that a
* bean's getBeanContext() method can be called to get a reference to its
* enclosing context.
*/
public class Example1 {
private static BeanContextSupport context = new BeanContextSupport(); // The
// BeanContext
private static BeanContextChildSupport bean = new BeanContextChildSupport(); // The
// JavaBean
public static void main(String[] args) {
report();
// Add the bean to the context
System.out.println("Adding bean to context...");
context.add(bean);
report();
}
private static void report() {
// Is the context empty?
System.out.println("Is the context empty? " + context.isEmpty());
// Has the context been set for the child bean?
boolean result = (bean.getBeanContext() != null);
System.out.println("Does the bean have a context yet? " + result);
// Number of children in the context
System.out.println("Number of children in the context: " + context.size());
// Is the specific bean a member of the context?
System.out.println("Is the bean a member of the context? "
+ context.contains(bean));
// Equality test
if (bean.getBeanContext() != null) {
boolean isEqual = (bean.getBeanContext() == context); // true means both
// references point
// to the same
// object
System.out.println("Contexts are the same? " + isEqual);
}
}
}
