Hey guys in this post, we will see the 5 different ways of creating objects in java. Let’s discuss it one by one –
5 Different ways
Following are the different ways to create a java object.
Using new keyword
- This is the most common way to create an object in java
- By using this approach we can call any constructor we want to call
MyClass myClass = new MyClass();
Using newInstance() method of class
- We can also use the newInstance() method of a Class class to create an object. The newInstance() calls the no-argument constructor to create the object.
- We can create an object by newInstance() in the following way
MyClass myClass = (MyClass) Class.forName("MyClass").newInstance();
- Whenever we call clone() on any object JVM actually creates a new object for us and copies all content of the previous object into it.
- Creating an object using the clone() does not invoke any constructor
MyClass myClass = new MyClass(); MyClass temp = (MyClass) myClass.clone();
Using object deserialization
- Object deserialization is nothing but creating an object from its serialized form
- whenever we serialize and then deserialize an object, JVM creates a separate object
- In deserialization, JVM doesn’t use any constructor to create the object
ObjectInputStream stream = new ObjectInputStream(anInputStream); MyClass myClass = (MyClass) stream.readObject();
Using newInstance() of constructor class
- Similar to the newInstance() of Class class, There is one newInstance() in the java.lang.reflect.Constructor class which we can use to create an object
- we can also use the parameterized constructor and private constructor by using this newInstance() method
Constructor constructor = Test.class.getDeclaredConstructor(); Test obj = constructor.newInstance();