Organization of the Petroleum Exporting Countries Interview Questions and Answers

The HashMap class is used to represent key-value pairs in Java.

• HashMap is a part of the Java Collections Framework.

• It allows null values and only one null key.

• It provides constant-time performance for basic operations like get and put.

• Example: HashMap<String, Integer> map = new HashMap<>();

Abstraction is the process of simplifying complex systems by focusing on essential details and hiding unnecessary complexities.

• Abstraction allows us to create models or representations of real-world objects or systems in software.

• It helps in managing complexity by breaking down a system into smaller, more manageable parts.

• Abstraction provides a level of indirection, allowing changes to be made in one part of the system...read more

try-catch is used in Java to handle exceptions and prevent program crashes.

• try-catch blocks are used to catch and handle exceptions that may occur during program execution.

• It allows the program to gracefully handle errors and prevent the program from crashing.

• The try block contains the code that may throw an exception, and the catch block handles the exception.

• Multiple catch blocks can be used to handle different types...read more

The statement to use for selecting based on integer inputs is the 'switch' statement.

• The 'switch' statement allows for multiple cases to be evaluated based on the value of an integer input.

• Each case represents a possible value of the input, and the corresponding code block is executed if the value matches.

• The 'switch' statement also provides a 'default' case which is executed if none of the cases match the input value.

• ...read more