People Tech Group Java Developer Interview Questions and Answers

Aptitude and verbal reasoning questions on hackerrank platform

Q1. What is inheritance?
Ans. 
Inheritance is a mechanism in Java where a new class inherits properties and behaviors from an existing class.
• Allows a class to inherit fields and methods from another class

• Promotes code reusability and reduces redundancy

• Creates a parent-child relationship between classes

• Derived class can access non-private members of the base class

• Example: class B extends class A
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Q2. What is an array in java?
Ans. 
An array in Java is a data structure that stores a fixed-size collection of elements of the same data type.
• Arrays are declared using square brackets [] after the data type.

• Elements in an array are accessed by their index, starting from 0.

• Example: String[] names = new String[5];
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Q3. Contagious storage of same data
Ans. 
Contagious storage of same data refers to multiple references pointing to the same data in memory.
• Contagious storage can lead to unexpected behavior if one reference modifies the data.

• Java uses pass-by-value, so when passing objects, a new reference is created pointing to the same data.

• Example: If two variables point to the same object and one variable modifies the object, the change is reflected in both variables.
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Logical and reasoning and blood relation

Java and html and oracle any assignment

Logical reasoning,numerical reasoning,logical problems

Array,String,Trees,searching,sortings