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.
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];
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 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 post
class keyword in Java language
One dimension Array in Java
Keywords in Java language
Keywords in C++ language
new keyword in C++ language
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