You are apparently trying to draw a graph by using normal widgets to draw the nodes of your graph. This is not a good idea. Consider using the Java 2D API (nowadays part of J2SE) to draw the complete graph. Have a look at java.awt.geom for predefined shapes. Also check out Sun's 2D Programmer's Guide
What is session facade?
What is the Reactor pattern?
What are Process Patterns?
How do you write a Thread Safe Singleton?
What is Singleton pattern?
Identify singleton classes in a university that maintains several separate collections including the following for storing the list of faculty members, the list of students, the list of staff members, and one that maintains a list of these collections themselves?
Explain about Template method?
Explain about locks?
Explain about semaphores?
Explain about fully synchronized objects?
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