The new keyword in Java programming language

The new keyword in Java programming language

In this tutorial, we will learn  about the new keyword in Java programming language

new is a keyword in Java which is used to create a Java object and allocate memory space in memory disk. new is also used for array creation.

new keyword is used in many ways in Java.

1. Array declaration
2. Object creation

Array declaration

syntax

The syntax of new keyword of array declaration

<data_type> <array_name>=new <datatype>[size];

Example

Example of array declaration using new keyword

int marks=new int[5];

String [][] stu_name=new String[5][10];

 

object declaration using new keyword

Syntax

<class_name> <object_name>=new <class_name>

Example

class school{
}
class student{

school obj=new school();

//this is an object for school class
}

Example

Program 1

program for using new keyword in Array

class new_keyword1{
  public static void main(String args[]){
  int number[]=new int[4];
  //Array declaration used bew keyword
  System.out.println("Value of index number[0] ="+number[0]);
  System.out.println("Value of index number[1] ="+number[1]);
  System.out.println("Value of index number[2] ="+number[2]);
  System.out.println("Value of index number[3] ="+number[3]);
  //display element of every cells of array
  
  }
}

 

When the above code is compiled and executed, it will produce the following results

Value of index number[0]= 0

Value of index number[1]= 0

Value of index number[2]= 0

Value of index number[3]= 0

 

Program 2

program for using new keyword in create object

class Stu_marks{
int marks=78;
  public static void main(String args[]){
  Stu_marks stu=new Stu_marks();
  System.out.println("Student marks :"+stu.marks);
  
  
  }
}

 

When the above code is compiled and executed, it will produce the following results

student marks :78

 

New keyword in Scanner class

New keyword is used in Scanner class for memory allocation when create Scanner object

Example

Scanner scan=new Scanner(System.in); //predefined standed input object

 

There are other Java language keywords that are similar to this keyword

abstract keyword in Java

boolean Keyword in Java

break keyword in Java

Byte keyword in Java 

case keyword in Java 

catch keyword in Java 

char keyword in Java 

class keyword in Java 

continue keyword in Java 

default keyword in Java 

do keyword in Java

double keyword in Java

else keyword in Java

enum keyword in Java

extends keyword in Java

final keyword in Java

finally keyword in Java

float keyword in Java

for keyword in Java

if keyword in Java

static keyword in Java

super keyword in Java

transient keyword in Java

public keyword in Java

private keyword in Java

protected keyword in Java

 

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