What will be the initial value of an object reference which is defined as an instance variable?

Q

✍: Guest

A

The object references are all initialized to null in Java. However in order to do anything useful with these references, you must set them to a valid object, else you will get NullPointerExceptions everywhere you try to use such default initialized references.

2013-06-28, 2553👍, 0💬

Is next a keyword in Java?
Is next a keyword in Java? No, next is not a keyword. 2013-06-26, 3173👍, 0💬

Can a public class MyClass be defined in a source file named YourClass.java?
Can a public class MyClass be defined in a source file named YourClass.java? No the source file name, if it contains a public class, must be the same as the public class name itself with a .java extension. 2013-07-02, 3027👍, 0💬

Is main a keyword in Java?
Is main a keyword in Java? No, main is not a keyword in Java. 2013-06-25, 3000👍, 0💬

Is exit a keyword in Java?
Is exit a keyword in Java? No. To exit a program explicitly you use exit method in System object. 2013-06-27, 2692👍, 0💬

Can main method be declared final?
Can main method be declared final? Yes, the main method can be declared final, in addition to being public static. 2013-07-02, 2618👍, 0💬

What will be the initial value of an object reference which is defined as an instance variable?
What will be the initial value of an object reference which is defined as an instance variable? The object references are all initialized to null in Java. However in order to do anything useful with these references, you must set them to a valid object, else you will get NullPointerExceptions everyw... 2013-06-28, 2554👍, 0💬

Is delete a keyword in Java?
Is delete a keyword in Java? No, delete is not a keyword in Java. Java does not make use of explicit destructors the way C++ does. 2013-06-26, 2448👍, 0💬

What is the default value of the local variables?
What is the default value of the local variables? The local variables are not initialized to any default value, neither primitives nor object references. If you try to use these variables without initializing them explicitly, the java compiler will not compile the code. It will complain abt the loca... 2013-07-01, 2415👍, 0💬

What are the different scopes for Java variables?
What are the different scopes for Java variables? The scope of a Java variable is determined by the context in which the variable is declared. Thus a java variable can have one of the three scopes at any given point in time. 1. Instance : - These are typical object level variables, they are initiali... 2013-06-28, 2350👍, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.