Core Java (All)

Keyword this in Java

The “this keyword” in Java refer to the the current object (current instance). All your instance variables may be referred as 'this.variableName' even though it is implicit in most cases. 

The “this keyword”  is mostly useful in below cases:

  1. Refer to instance variables of a class when a local variable has precedence over it.

Classes and Objects in Java

Java is a programming language that follows the Object-Oriented Programming (OOP) principles. OOP model focusses on realworld objects to model applications. A real world object will have some properties and some behaviour. For example, human will have properties like height, weight etc. and behaviours like walk, run, talk, etc.  

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Looping Constructs in Java - For and For-Each

Looping constructs in Java are:

  • For statement

  • For-each statement

  • While statement

  • Do while statement

We will see for and for-each here. We will see while, do while, break and continue statements in next note. 

 

The for statement

Syntax of for loop is: [node:read-more:link]

ArrayList Class Basic Concepts

ArrayList is a resizable-array implementation of the List interface. [node:read-more:link]

Traversing, Comparing and Copying Arrays

Traversing arrays

Traversing an array is the process of visiting each element of an array.

Two common ways to traverse an array are:

  • simple for loop / while loop

  • for-each loop

 

Example array

int[] myArray = {1,2,3,4,5}

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