Java Keywords Study Notes

abstract: Declares classes or methods with no implementation. Only subclasses must implement abstract methods or remain abstract. Instances of an abstract class cannot be created.
assert: Introduced in J2SE 1.4 for assertions, which are statements that should always be true. If false, an AssertionError is triggered, aiding in debugging.
boolean: Data type for storing true or false values; can be used for method return types.
break: Terminates the current block of execution, transferring control to the statement following the block. Can be used with labels for specific control flows.
byte: Data type for an 8-bit signed two's complement integer, used in field declarations and method return types.
case: Used in switch statements to define individual cases for control flow based on variable values.
catch: Defines an exception handler that executes if an associated try block throws an exception. It checks for class compatibility with the thrown exception.
char: Data type for a single 16-bit Unicode character, applicable in field and method return declarations.
class: Defines the structure and behavior of objects, specifying fields, methods, interfaces, and inheritance relationships. Implicitly inherits from Object if no superclass is defined.
const: Reserved keyword in Java, though not used. Constants are defined using the 'final' keyword instead.
continue: Skips the current iteration of a loop and jumps to the end. Can be labeled for specific loop control.
default: Used in switch statements to label a block executed when no case matches. Also applicable for default values in Java annotations.
do: Works with while to create a do-while loop, executing the block at least once and then testing a condition for continued execution.
double: Represents a 64-bit double precision floating-point number, used in field and method return type declarations.
else: Complements if statements, defining an alternate block of code executed if the if condition evaluates to false.
enum: Declares enumerated types in Java, which are specialized classes extending the base class Enum.
extends: Used in classes to indicate superclass inheritance and in interfaces for specifying superinterfaces. Facilitates adding or modifying functionality in subclasses or subinterfaces.