With the code: public class JavaIsGood { public static void main(String[] args)
ID: 3594422 • Letter: W
Question
With the code:
public class JavaIsGood {
public static void main(String[] args) {
String str = new String("I love Java!");
Object obj = str;
String n = (String)obj;
}
}
When casting obj to str in String n = (String)obj, a new object is created?
When declaring str in String str = new String(..), the String constructor is being invoked from the class String?
The new keyword in the line String str = new String(..), is instantiating the class String which means the same thing as creating a String object?
When assigning str to obj in Object obj = str, a new object is created?
Explanation / Answer
When casting obj to str in String n = (String)obj, a new object is not created as String uses string pooling i.e. if same string value exists in heap, it will point to existing Object.
When declaring str in String str = new String(..), the String constructor is being invoked from the class String?
Yes. String constructor invoked from class String.
The new keyword in the line String str = new String(..), is instantiating the class String which means the same thing as creating a String object?
Yes
When assigning str to obj in Object obj = str, a new object is created?
Yes, because the class type has changed, Object class instance may have its own extra properties which are not inn String class.