CODEWITHSUNDEEP
java
user2047496
user2047496

Reputation:

Is there another way to create objects in java rather than using the "new" keyword?

One of my lecturer said that there are some other ways to create/instantiate objects in Java rather than using the "new" keyword. If it is possible, please guide me how to do so?

Upvotes: 3

Views: 193

Answers (4)

Ankit Bansal
Ankit Bansal

Reputation: 5072

Looks like more of an interview question but I will still answer it :)

Reflection is one way to create instance of an object. You can Class.forName("abc.de.FGH").newInstance() to create an instance

The other way is to use deserialization assuming an object is serialized.

new ObjectInputStream(anInputStream ).readObject();

One other way I could think of it is cloning.

Object otherObject = mainObject.clone();

Primitive Types, String Literals are other ways of creating object though they are specific to certain types.

Upvotes: 2

Arslan Ali
Arslan Ali

Reputation: 17802

Yes, objects are instantiated using the "new" keyword. But this doesn't mean, they can be instantiated only this way.

Have a look at the following code(Java):

public class SimpleClass {

    public static SimpleClass instantiateAnObjectForMe() {

        return new SimpleClass();      

    } 
}

And then somewhere else in your project, You can create the instance of the class by calling the static method I wrote above like so:

SimpleClass simpleObject = SimpleClass.instantiateAnObjectForMe();

I hope you get the idea :)

Upvotes: 1

skirsch
skirsch

Reputation: 1737

One example is Object.class.newInstance(). There are more complex ways using java reflection, here is one of many tutorials.

Upvotes: 0

Marcin Pietraszek
Marcin Pietraszek

Reputation: 3214

Yes, you could create object using reflection or with autoboxing mechanism or any other literals built in to language.

String x = "abc";
int[] y = {1, 2, 3}
Object z = classObject.newInstnce();

Upvotes: 1

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