What are all the Different Ways to Create an Object in Java??

As you know, in Java, a class provides the blueprint for objects; you create an object from a class. There are four different ways to create objects in java:

Method 1. Using new keyword. This is the most common way to create an object in java. Almost 99% of objects are created in this way.

CrunchifyObj object = new CrunchifyObj();

Method 2. Using Class.forName(). Class.forName() gives you the class object, which is useful for reflection. The methods that this object has are defined by Java, not by the programmer writing the class. They are the same for every class. Calling newInstance() on that gives you an instance of that class (i.e. calling

Class.forName("ExampleClass").newInstance()

new ExampleClass()

CrunchifyObj object2 = (CrunchifyObj) Class.forName("com.crunchify.tutorials.CrunchifyObj").newInstance();

Another must read:

• Java: Thread State Introduction with Example
• Simple Java Enum Example

Method 3. Using clone(). The clone() can be used to create a copy of an existing object.

CrunchifyObj secondObject = new CrunchifyObj();
CrunchifyObj object3 = (CrunchifyObj) secondObject.clone();

Method 4. Using Object Deserialization. Object Deserialization is nothing but creating an object from its serialized form.

InputStream inputStream = null;
ObjectInputStream inStream = new ObjectInputStream(inputStream);
CrunchifyObj object4 = (CrunchifyObj) inStream.readObject();

Complete Example:

package com.crunchify.tutorials;

import java.io.InputStream;
import java.io.ObjectInputStream;

/**
 * @author Crunchify.com
 */

public class CrunchifyObj implements Cloneable{

	public CrunchifyObj() {
		System.out.println("Hi!");
	}

	@Override
    protected Object clone() throws CloneNotSupportedException {
        return  (CrunchifyObj) super.clone();
    }

	@SuppressWarnings("unused")
	public static void main(String[] args) throws Exception {

		// Create Object1
		CrunchifyObj object1 = new CrunchifyObj();

		// Create Object2
		CrunchifyObj object2 = (CrunchifyObj) Class.forName("com.crunchify.tutorials.CrunchifyObj").newInstance();

		// Create Object3
		CrunchifyObj secondObject = new CrunchifyObj();
		CrunchifyObj object3 = (CrunchifyObj) secondObject.clone();

		// Create Object4
		InputStream inputStream = null;
		ObjectInputStream inStream = new ObjectInputStream(inputStream);
		CrunchifyObj object4 = (CrunchifyObj) inStream.readObject();
	}
}

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