these include:
- arithmetic operators
- assignment operators
- comparison operators
- and logical operators.
What are the different types of operators in Java?
What is the role of the Java Virtual Machine (JVM) in achieving platform independence?
This acts as an interpreter or a just-in-time (JIT) compiler that executes the bytecode generated by the Java compiler. It translates the bytecode into machine code specific to the underlying platform.
These include:
- Logical AND (&&)
- Logical OR (||)
- Logical NOT (!)
Give examples of logical operators in Java.
the rules for these are:
- They cannot be a Java keyword
- they must start with a letter, underscore (_), or dollar sign ($)
- they can contain letters, digits, underscores, and dollar signs.
What are the rules and conventions for Java identifiers?
What is platform independence in Java?
this in Java refers to the ability of a program to run on different platforms or operating systems without requiring any modifications or recompilation.
The two main categories of these in Java are:
- primitive
- reference
What are the two main categories of data types in Java?
What are identifiers in Java?
these are names given to variables, classes, methods, and other elements in Java. They are used to uniquely identify these elements within a program.
Define abstraction
Representing essential features of an object and hiding unnecessary complexities
The ability of objects to take on many forms and exhibit different behaviors based on their types or classes
Define polymorphism
Explain the usage of the access modifier public
these members can be accessed from any class or package and have the broadest scope of visibility.
Explain the usage of the access modifier private
These members are accessible only within the same class, providing a level of data encapsulation.
How does encapsulation support code maintenance in Java?
Encapsulation facilitates this in Java by enabling modifications to the internal implementation of a class without impacting the external code dependent on its public interface.
This reduces the ripple effect of changes and enhances code maintainability.
Representing essential features of an object and hiding unnecessary complexities
Define abstraction
How does encapsulation protect the object’s internal representation?
This protects the object’s internal representation by providing controlled access to its data through public methods.
These methods regulate interactions with the object and ensure that its internal state remains secure.
these include:
- Equal to (==)
- Not equal to (!=)
- Greater than (>)
- Less than (<)
- Greater than or equal to (>=)
- Less than or equal to (<=)
Give examples of comparison operators in Java.
These members are accessible only within the same class, providing a level of data encapsulation.
Explain the usage of the access modifier private
What are the steps to create encapsulated classes in Java?
steps to accomplish this are:
- Declare class variables as private
- Provide public getter and setter methods
- Implement validation and business logic.
What is the “Write Once, Run Anywhere” principle associated with Java?
This principle means that developers can write Java code once and expect it to run on any platform that supports Java, eliminating the need for platform-specific code.
This acts as an interpreter or a just-in-time (JIT) compiler that executes the bytecode generated by the Java compiler. It translates the bytecode into machine code specific to the underlying platform.
What is the role of the Java Virtual Machine (JVM) in achieving platform independence?
What is the relationship between objects, classes, and inheritance?
An object is an instance of a class, representing a specific entity or concept.
A class is a blueprint or template for creating objects.
Inheritance is a mechanism in which one class inherits the properties and behaviors of another class, promoting code reuse and allowing for the creation of class hierarchies.
benefits of this include:
- Simplified development: this allows developers to focus on writing code without worrying about platform-specific details. They can write code once and expect it to run on any platform, saving time and effort.
- Reduced maintenance effort: Since Java programs can run on multiple platforms without modifications, updates or bug fixes only need to be applied once. This reduces the maintenance effort required for supporting different platforms.
- Widespread support: this feature has made java popular across various industries and platforms. It is widely supported, ensuring compatibility and availability of Java applications on different operating systems and devices.
What are the benefits of platform independence in Java?
these include:
- Compiled languages: In compiled languages, the source code is translated into machine code before execution. Examples include C, C++, and Swift.
- Interpreted languages: In interpreted languages, the source code is executed line by line by an interpreter. Examples include Python, JavaScript, and Ruby.
- JIT (Just-In-Time) compiled languages: JIT languages combine elements of both compiled and interpreted languages. The source code is initially compiled into an intermediate representation (bytecode) and then dynamically compiled into machine code during runtime. Java and C# are examples of JIT compiled languages.
What are the three main types of programming languages?
these members can be accessed from any class or package and have the broadest scope of visibility.
Explain the usage of the access modifier public
Encapsulation facilitates this in Java by enabling modifications to the internal implementation of a class without impacting the external code dependent on its public interface.
This reduces the ripple effect of changes and enhances code maintainability.
How does encapsulation support code maintenance in Java?
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Topic 1.1: Java Basics - Define the scope of variables24
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Topic 1.2: Java Basics - Define the structure of a Java class14
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Topic 1.3: Java Basics - Create executable Java applications with a main method; run a Java program from the command line; produce console output54
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Topic 1.4: Java Basics - Import other Java packages to make them accessible in your code46
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Topic 1.5: Java Basics - Compare and contrast the features and components of Java such as: platform independence, object orientation, encapsulation, etc62
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Topic 2.1: Working With Java Data Types - Working With Java Data Types: Declare and initialize variables (including casting of primitive data types)81
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Topic 2.2: Working With Java Data Types - Differentiate between object reference variables and primitive variables10
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Topic 2.3: Working With Java Data Types - Know how to read or write to object fields28
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Topic 2.4: Working With Java Data Types - Explain an Object's Lifecycle (creation, "dereference by reassignment" and garbage collection)16
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Topic 2.5: Working With Java Data Types - Develop code that uses wrapper classes such as Boolean, Double, and Integer20
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Topic 3.1: Using Operators and Decision - Use Java operators; use parentheses to override operator precedence18
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Topic 3.2: Using Operators and Decision Constructs - Test equality between Strings and other objects using == and equals ()17
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Topic 3.3 and 3.4: Using Operators and Decision Constructs - Create if and if/else and ternary constructs and use a switch statement8
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Topic 4.1 and 4.2: Creating and Using Arrays - Declare, instantiate, initialize and use a one-dimensional array and Declare, instantiate, initialize and use multi-dimensional arrays28
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Topic 5: Using Loop Constructs19
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Topic 6.2: Working with Methods and Encapsulation - Apply the static keyword to methods and fields15
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Topic 6.5: Working with Methods and Encapsulation - Apply encapsulation principles to a class16
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Topic 6.6: Working with Methods and Encapsulation - Determine the effect upon object references and primitive values when they are passed into methods that change the values6
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Topic 7.1: Working with Inheritance - Describe inheritance and its benefits22
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Topic 7.2: Working with Inheritance - Develop code that makes use of polymorphism develop code that overrides methods differentiate between the type of a reference and the type of an object33
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Topic 7.4: Working with Inheritance - Use super and this to access objects and constructors5
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Topic 8.1: Handling Exceptions - Differentiate among checked exceptions, unchecked exceptions, and Errors52
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Topic 8.2: Handling Exceptions - Create a try-catch block and determine how exceptions alter normal program flow79
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Topic 8.3: Handling Exceptions - Describe the advantages of Exception handling13
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Topic 8.4: Handling Exceptions - Create and invoke a method that throws an exception29
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Topic 8.5: Handling Exceptions - Recognize common exception classes (such as NullPointerException, ArithmeticException, ArrayIndexOutOfBoundsException, ClassCastException)68
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Topic 9.1: Working with Selected classes from the Java API - Manipulate data using the StringBuilder class and its methods36
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Topic 9.2: Working with Selected classes from the Java API - Create and manipulate Strings36
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Topic 9.3: Working with Selected classes from the Java API - Create and manipulate calendar data using classes from java.time.LocalDateTime...95
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Topic 9.4: Working with Selected classes from the Java API - Declare and use an ArrayList of a given type44
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Topic 9.5: Working with Selected classes from the Java API - Write a simple Lambda expression that consumes a Lambda Predicate expression38
