Immutability!!.How to achieve over classes/methods/variables?

Difference between String ,StringBuffer & StringBuilder?

Run this simple java program and create scenerio of String object creation in your mind.You will see huge difference than expectation. I would recommend to first try on your own then follow the solution . As you execute the above line of codes in your Java Runtime Environment .As compiler read the lines .In case of String a= new String("Hello"); As it will allow compiler to create a new string object .It is always mandatory for compiler to allocate a memory space in heap whenever new keyword is used.So String class object created successfully in heap with reference variable a.And a very important point need to be noted down that here "new String("Hello');" ...

DS PROBLEM :Find a pair with given sum in a BST(Binary Search Tree)

Problem : Given a Balanced Binary Search Tree and a target sum, write a function that returns true if there is a pair with sum equals to target sum, otherwise return false. Expected time complexity is O(n) and only O(Logn) extra space can be used. Any modification to Binary Search Tree is not allowed. Note that height of a Balanced BST is always O(Logn). Solution: There are two approaches to solve the problem The Brute Force Solution is to consider each pair in BST and check whether the sum equals to X. The time complexity of this solution will be O(n^2).

Before Starting MicroServices just walk through Orchestration !! Matters a lot

What is this Orchestration : Orchestration is the traditional way of handling interactions between different services in Service-Oriented Architecture (SOA). With orchestration process, there is typically one controller that acts as the “orchestrator” of the overall service interactions. This typically follows a request/response type pattern. For example, if three services needed to be called in a particular order, the orchestrator makes a call to each one, waiting for a response before calling the next.

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