Java New Keyword
To create a class instance in Java, use the new keyword. In other words, it returns a reference to the memory that was allocated for a new object and instantiates the class by returning that memory. The array object can also be created by using the new keyword.
Java's new keyword creates an instance of a class by allocating the necessary memory for a new object that goes along with it. A reference to that memory is then returned. In Java, the new keyword is frequently used to generate array objects as well. A call to the function Object () {[native code]}, which creates the new object, comes after the new keyword.
In Java, we instantiate a class by allocating the necessary memory for a new object by using the new keyword. After the creation of the object, the new keyword returns a reference to that memory. The Java new keyword can occasionally be used to generate array objects.
Syntax:
Example obj=newExample ();
Important Points to Remember
- New keyword is implemented in the program to create the objects.
- At run time allocation of the memory is done using new keyword.
- The objects that are created, are stored in theheap memory or heap area.
- The java new keyword calls or invokes the object consturctor.
- Calling the function Object () {[native code]} requires a single, postfix parameter.
- The runtime memory allocation for new objects is done via the new keyword.
- The heap memory is used to allocate memory to the new objects.
- A call to the function Object () {[native code]}, which creates the new object, comes after the new keyword.
A call to the class function Object () {[native code]} is the sole postfix parameter required by the new operator. What happens when an object of a class is created is specified in the function Object () {[native code]}. All classes need constructors, which are significant in many important ways. We will use the default function Object () {[native code]} in the example below.
Examples of java New Keyword
Example 1:
It is a straightforward example of creating an object with the new keyword and calling the method with the appropriate object reference.
public class NewEx1 {
void disp ()
{
System.out.println("method is called or invoked");
}
public static void main (String [] s) {
NewEx1 j=new NewEx1();
j. disp ();
}
}
Output:
method is called or invoked
Example 2:
Simple example of calling the function Object () {[native code]} with the appropriate object reference and the new keyword to build an object.
public class NewEx2 {
NewEx2()
{
System.out.println("Constructor is called");
}
public static void main (String [] s) {
NewEx2 o=new NewEx2();
}
}
Output of the program:
Constructor is called
Example 3:
Using the new keyword, we create an object and call the parameterized function Object () {[native code]}.
public class NewEx3 {
int f,g;
NewEx3(int f, intg)
{
this. f=f;
this. g=g;
}
void disp ()
{
System.out.println(f+g);
}
public static void main (String [] s) {
NewEx3 bj=new NewEx3(20,20);
obj. disp();
}
}
Output:
40
Conclusion Points
- Java's new keyword creates an instance of a class by allocating memory for a new object that goes along with it. After that, a reference to that memory is returned.
- This brand-new Java term allocates the RAM during runtime.
- The heap memory is allocated to the objects by the new keyword.
- A single postfix function Object () {[native code]} is needed to create the relevant class when using the new keyword.
- It is possible to think of the crucial term "instantiating a class" as "making an object." An "instance" of the class is what we produce when we construct an object.
- To maximize efficiency, Java primitive types are never implemented as objects but rather as "regular" variables. For help understanding the primitive data types, see Wrapper Classes.
- By using the memory reference that the new keyword returns, we can initialize a variable.
- The memory reference does not need to be assigned to a variable of the right type in order to be utilized to call the members of the new object directly.