Multithreading: https://blog.stackademic.com/i-finally-understood-multithreading-and-now-my-code-runs-10x-faster-656453c7a2b0 https://blog.stackademic.com/why-80-of-java-developers-struggle-with-multithreading-275641ce2d70 Java Questions: https://medium.com/@pudarimadhavi99/mastering-java-collections-15-tricky-interview-questions-every-developer-should-know-18edb64d60e1 null check: https://blog.stackademic.com/writing-null-thats-what-junior-devs-do-here-s-the-senior-way-6c2a6c08cf18 spring boot: https://medium.com/@pudarimadhavi99/advanced-spring-boot-concepts-every-java-developer-should-know-575fe023d4e5 https://medium.com/@pudarimadhavi99/advanced-spring-boot-concepts-every-java-developer-should-know-part-2-56f37d76f91a interview prep: https://medium.com/@kotiavula6/i-cracked-the-jp-morgan-java-developer-interview-heres-everything-they-asked-with-real-code-d107bbe26d30

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