1,Diff bwn aggregation and composition? 2,w a p to print fibnoci sries? with recursion? 3,Diff bwn interface and abstract? 4,w ap to print * patteren? * ** *** **** 5,Explain custom immutable class? 6,what is immutable? 7,what is singleton?w ap for single ton? 8,how can threads communicates each other? 9,what is diff bwn t.start() and t.run()? 10,what is thread priority? 11,what is deadlock?how can u avoid deadlock?

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Aggregation and composition are both forms of association in object-oriented programming.
Aggregation represents a 'has-a' relationship, where one object contains another object as a part.
Composition is a stronger form of aggregation, where the lifetime of the contained object is controlled by the container object.
Fibonacci series can be printed using recursion by defining a recursive function that calculates the next number based on the previous two numbers.
Interfaces and abstract classes are both used for abstraction in Java.
An interface defines a contract that a class must implement, while an abstract class can provide partial implementation.
A custom immutable class is a class whose state cannot be changed after it is created.
Immutable classes are useful for representing values that should not be modified.
A singleton is a design pattern that restricts the instantiation of a class to a single object.
Threads can communicate with each other through shared variables or by using inter-thread communication mechanisms like wait(), notify(), and notifyAll().
t.start() is used to start a new thread and t.run() is used to execute the run() method of the thread in the current thread.
Thread priority is used to determine the order in which threads are scheduled to run by the operating system.
Deadlock occurs when two or more threads are blocked forever, waiting for each other to release resources.
Deadlock can be avoided by using proper synchronization, avoiding nested locks, and using timeouts.

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