CODEWITHSUNDEEP
java
Suraj HK
Suraj HK

Reputation: 299

Typecast Object type to user defined POJO in java

Consider an example 

public Object myMethod()
{
     //some condition
     return obj of type Object1;
     //else
     return obj of type Object2;

}

I call it as follows,

Object obj = myMethod();

obj = (obj instanceof Object1)? (Object1)obj : (Object2) obj;

My problem is even after typecasting obj is neither of type Object1 nor of type Object2. What is the best way to solve this?

Upvotes: 2

Views: 2333

Answers (2)

Dennis
Dennis

Reputation: 3731

The object you are casting is already the correct type. Your cast after the call to myMethod is useless.

You need to assign the cast object to a reference of the same type in order to use it.

Object obj = myMethod();
if( obj instanceof Object1 ){
   doSomething((Object1) obj);
} else {
   doSomething((Object2) obj);
}

You can then use the correct interface in your overloaded doSometing methods.

Upvotes: 1

Eran
Eran

Reputation: 393936

There's no point in casting without assigning to a variable of the type you are casting to, so you'll need two variables.

Object obj = myMethod();
Object1 obj1 = null;
Object2 obj2 = null;
if (obj instanceof Object1) {
    obj1 = (Object1) obj;
    // some specific Object1 handling
} else if (obj instanceof Object2) {
    obj2 = (Object2) obj;
    // some specific Object2 handling
}

Upvotes: 3

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