Java Core Programming Awareness (Entry Level)

Topics covered

• create a custom class loader with the right method implementations
• create a for loop and use the break and continue keywords to control its flow
• create objects of a Java class and use getters and setters to edit fields
• define constructors and use them to initialize member variables in Java
• describe how composite data can be created and accessed in the form of arrays in Java
• examine how to work with the .equals() and .hashCode() methods and the hashCode contract
• identify the difference between static and instance variables
• implement custom and built-in classes derived from the Object base class
• initialize fields using the 'this' keyword
• investigate the nuances of the protected access modifier
• invoke the right methods based on the runtime types of objects
• outline pass-by-value and pass-by-reference with custom objects
• overload methods with the same name and different number and types of input arguments
• perform up-casting and down-casting operations on objects
• recall how arithmetic operations in Java follow the PEMDAS rules when evaluating expressions
• recognize how imports work in JShell and how objects can be instantiated
• recognize how programming is affected by the static typing requirement in Java and the effects of its just-in-time compiler
• recognize some of the fundamental syntactic rules in Java
• recognize the limits of different Java data types in terms of what values they can store
• specify default implementations for interface methods
• use abstract base classes in inheritance hierarchies
• use multiple if statements and explore the use of else-if blocks
• use null values in Java to specify that a variable does not have any value
• use the final modifier with methods to prevent overriding and with classes to prevent inheritance
• use the super keyword to invoke a base class constructor from a derived class