TCS Java Developer Interview Questions, Process, and Tips

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Q1. Asked about java questions
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Q1. Java basics, sping boot basics
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Q1. Hash map internally
Ans. 
HashMap internally uses an array of linked lists to store key-value pairs.
• HashMap uses hashing to determine the index of the key in the array.

• If multiple keys hash to the same index, a linked list is used to store them.

• HashMap allows one null key and multiple null values.

• Example: HashMap map = new HashMap<>();
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Q2. Capacity 16 and its only one null element
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Capacity 16 with only one null element means there are 15 non-null elements in the array.
• The array has a total capacity of 16 elements.

• There is only one null element in the array.

• This implies that there are 15 non-null elements in the array.
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Q1. Java concepts and problems
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Q1. Basic java questions and from resume
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Q1. Basics java questions and SQL queries asked
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