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Junior Java Developer Interview Questions

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3,800 junior java developer interview questions shared by candidates

Re-enterant lock How to increase memory of heap in java -xms256m,xmx2014m test.java Is jar enough for client deloyemnt -- I said jre sould be installed and then jar How to override equal() -- public boolen Equals(Object o){} Working of hash map Is concurrent hash map thread safe? Is Singleton thread safe? How to convert array to arraylist? -- Arrays. asList() Can we override static method? How to remove an element from set? -- mySet.remove(Object) How to count number of word present in String -- used hashset implementation What is race condition? -- multithread oprations What is context switching? -- it is used in threads to retain its state when a thread moves to runnable state after getting execution time for few seconds. Simple join in two tables Null insertion in TreeSet or TreeMap -- for the first time we can add it as first element, after that we'll get NPE because of sorting require to compare two objects. Null Insertion in HashMap -- in 0th bucket. Deamon Thread Thread executer framework Diff between Collections and Collection Implicit objects of jsp. What is Future class.
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Junior Java Developer

Interviewed at Capgemini

4.2★
Sep 16, 2021

Re-enterant lock How to increase memory of heap in java -xms256m,xmx2014m test.java Is jar enough for client deloyemnt -- I said jre sould be installed and then jar How to override equal() -- public boolen Equals(Object o){} Working of hash map Is concurrent hash map thread safe? Is Singleton thread safe? How to convert array to arraylist? -- Arrays. asList() Can we override static method? How to remove an element from set? -- mySet.remove(Object) How to count number of word present in String -- used hashset implementation What is race condition? -- multithread oprations What is context switching? -- it is used in threads to retain its state when a thread moves to runnable state after getting execution time for few seconds. Simple join in two tables Null insertion in TreeSet or TreeMap -- for the first time we can add it as first element, after that we'll get NPE because of sorting require to compare two objects. Null Insertion in HashMap -- in 0th bucket. Deamon Thread Thread executer framework Diff between Collections and Collection Implicit objects of jsp. What is Future class.

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