BeanContextSupport: contains(Object o) : BeanContextSupport « java.beans.beancontext « Java by API

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2. java.beans.beancontext
3. BeanContextSupport

BeanContextSupport: contains(Object o)

  

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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() {
    // Print out a report of the context's membership state.
    // 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);
    }
  }
}

   
    
  

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