SSP Technology Java Developer Interview Questions and Answers

String program swapping the 2 nomber without using 3 variable

Q1. Oop and multithreading
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Q2. Oops concepts What is thread
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Thread is a lightweight sub-process that allows concurrent execution within a single process.
• Thread is a unit of execution within a process.

• Threads share the same memory space and resources of the process.

• Threads allow for concurrent execution, improving performance.

• Example: In a web server, each request can be handled by a separate thread.
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Q3. Exception handling
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Q4. Difference array and list
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Arrays have fixed size, lists can dynamically grow. Arrays can only store elements of the same type, lists can store different types.
• Arrays have a fixed size, while lists can dynamically grow in size.

• Arrays can only store elements of the same type, while lists can store different types of elements.

• Arrays use square brackets [] for declaration and initialization, while lists use angle brackets <>.
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Q5. What is forigne key
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A foreign key is a column or a group of columns in a database table that uniquely identifies a record in another table.
• Used to establish a relationship between two tables in a database

• Enforces referential integrity

• Helps maintain data consistency

• Example: If a 'Orders' table has a foreign key 'customer_id' that references the 'Customers' table's 'id' column
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