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What happens when a class is loaded into memory?
What happens when a class is loaded into memory?
- No object is created until it's explicitly called
- A static object is created immediately (correct)
- An ordinary object is created immediately
- A dynamic object is created immediately
How are static variables different from non-static variables?
How are static variables different from non-static variables?
- Static variables have a single instance while non-static variables have multiple instances (correct)
- Static variables are bound to specific objects while non-static variables are not
- Static variables are created only when needed while non-static variables are always created
- Static variables are not accessible inside the class while non-static variables are accessible
What is the default value for an uninitialized static variable of type double?
What is the default value for an uninitialized static variable of type double?
- 0
- 1.0
- 0.0
- -1
Which keyword do you use to declare a static variable in a class?
Which keyword do you use to declare a static variable in a class?
How can you refer to a class's static variables inside the class?
How can you refer to a class's static variables inside the class?
What is the key difference between ordinary variables and static variables in Java?
What is the key difference between ordinary variables and static variables in Java?
In Java, how can you access a static variable defined in a class from another class?
In Java, how can you access a static variable defined in a class from another class?
What happens to static variables when the Java machine finishes loading a class?
What happens to static variables when the Java machine finishes loading a class?
What is the memory organization difference between static and non-static variables immediately after loading a class in Java?
What is the memory organization difference between static and non-static variables immediately after loading a class in Java?
What is a characteristic of accessing ordinary (non-static) variables in Java?
What is a characteristic of accessing ordinary (non-static) variables in Java?
What happens when a class is loaded into memory in Java?
What happens when a class is loaded into memory in Java?
What is the default value for an uninitialized static variable of type boolean in Java?
What is the default value for an uninitialized static variable of type boolean in Java?
How can you access a static variable defined in a class from another class in Java?
How can you access a static variable defined in a class from another class in Java?
What is the characteristic of accessing ordinary (non-static) variables in Java?
What is the characteristic of accessing ordinary (non-static) variables in Java?
What is the key difference between ordinary variables and static variables in Java?
What is the key difference between ordinary variables and static variables in Java?
What is the key difference between an ordinary (non-static) variable and a static variable in Java?
What is the key difference between an ordinary (non-static) variable and a static variable in Java?
How are static variables different from non-static variables in terms of memory organization immediately after loading a class in Java?
How are static variables different from non-static variables in terms of memory organization immediately after loading a class in Java?
Which keyword do you use to declare a static variable in a class?
Which keyword do you use to declare a static variable in a class?
What happens to static variables when the Java machine finishes loading a class?
What happens to static variables when the Java machine finishes loading a class?
In Java, how can you access a static variable defined in a class from another class?
In Java, how can you access a static variable defined in a class from another class?
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Study Notes
Class Loading and Static Variables
What Happens When a Class is Loaded into Memory?
- When a class is loaded into memory, all static variables are initialized and memory is allocated for them.
- Static variables are stored in memory with the class definition, not with instances of the class.
Static Variables vs. Non-Static Variables
- Static variables are shared by all instances of a class, whereas non-static variables are unique to each instance.
- Static variables are stored in a single location in memory, while non-static variables have separate copies in each instance.
Declaring and Accessing Static Variables
- The
statickeyword is used to declare a static variable in a class. - Inside the class, static variables can be referred to by their variable name.
- From another class, static variables can be accessed using the class name, e.g.,
ClassName.variableName.
Default Values for Uninitialized Static Variables
- The default value for an uninitialized static variable of type
doubleis 0.0. - The default value for an uninitialized static variable of type
booleanisfalse.
Memory Organization Difference
- Immediately after loading a class, static variables are stored in a single location in memory, while non-static variables are stored in separate locations for each instance.
Accessing Ordinary (Non-Static) Variables
- Ordinary (non-static) variables can only be accessed through an instance of the class.
- Each instance of the class has its own copy of ordinary variables.
What Happens to Static Variables When the Java Machine Finishes Loading a Class?
- Static variables remain in memory as long as the class is loaded.
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