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The new operator in Java
The new operator is used in Java to create new objects. It can also be used to create an array object.
Let us first see the steps when creating an object from a class −
Declaration − A variable declaration with a variable name with an object type.
Instantiation − The 'new' keyword is used to create the object.
Initialization − The 'new' keyword is followed by a call to a constructor. This call initializes the new object.
Now, let us see an example −
Example
public class Puppy {
public Puppy(String name) {
// This constructor has one parameter, name.
System.out.println("Passed Name is : " + name );
}
public static void main(String []args) {
// Following statement would create an object myPuppy
Puppy myPuppy = new Puppy( "jackie" );
}
}Output
Passed Name is : jackie
Now, let us see an example to create an array using the new operator −
Example
public class Main {
public static void main(String[] args) {
double[] myList = new double[] {1.9, 2.9, 3.4, 3.5};
// Print all the array elements
for (int i = 0; i < myList.length; i++) {
System.out.println(myList[i] + " ");
}
// Summing all elements
double total = 0;
for (int i = 0; i < myList.length; i++) {
total += myList[i];
}
System.out.println("Total is " + total);
// Finding the largest element
double max = myList[0];
for (int i = 1; i < myList.length; i++) {
if (myList[i] > max) max = myList[i];
}
System.out.println("Max is " + max);
}
}Output
1.9 2.9 3.4 3.5 Total is 11.7 Max is 3.5
Updated on: 20-Sep-2019
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