Final vs Finaly vs finalize in java Java Interview Questions Part 7

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final: In Java, "final" is a keyword that can be used to declare a variable, a method, or a class. When applied to a variable, it means the variable's value cannot be changed once it has been assigned. When applied to a method, it means the method cannot be overridden by subclasses. When applied to a class, it means the class cannot be subclassed. Here are some examples:

final int x = 10; // x is a constant and cannot be modified
final class MyClass {} // MyClass cannot be subclassed
final void myMethod() {} // myMethod cannot be overridden

finally: "finally" is a keyword in Java that is used in exception handling along with the "try" and "catch" blocks. It is used to define a block of code that will be executed regardless of whether an exception is thrown or not. It ensures that certain cleanup or resource release tasks are performed. Here's an example:

try {
// Code that may throw an exception
} catch (Exception e) {
// Exception handling code
} finally {
// Code that will always be executed
// e.g., closing database connections, releasing resources
}
finalize: "finalize" is a method defined in the "Object" class in Java. It is called by the garbage collector before an object is reclaimed for memory deallocation. It can be overridden in a class to define specific cleanup actions for an object before it is garbage collected. However, it is generally recommended to use other mechanisms, such as try-with-resources or explicit resource management, for resource cleanup rather than relying on the "finalize" method. Here's an example:


class MyClass {
// Other class members

@Override
protected void finalize() throws Throwable {
// Cleanup actions before object is garbage collected
super.finalize();
}
}
To summarize, "final" is a keyword used for declaring constants, methods, or classes, "finally" is used in exception handling to define code that executes regardless of exceptions, and "finalize" is a method called by the garbage collector before an object is garbage collected.

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