Java Core in Practice: 120+ Exercises and Quizzes for 2025

• Overview of course and what will be covered

• Goals and objectives of the course

• Prerequisites and recommended background knowledge

• Course materials and resources

• Introduction to the Java programming language and its importance in the industry

• Installing the Java Development Kit (JDK)

• Configuring the JDK and setting the JAVA_HOME environment variable

• Installing the Java Development Kit (JDK)

• Common errors that may occur while setting up the development environment

• How to troubleshoot and resolve these errors

• Creating a new Java file

• Understanding the structure of a Java program and the role of the main method

• Writing code for a simple console program

• Compiling .java files to bytecode

• Running the program from the command line

• Creating a new Java file

• Understanding the structure of a Java program and the role of the main method

• Writing code for a simple console program

• Compiling .java files to bytecode

• Running the program from the command line

• Definition and purpose of IDEs

• Comparison of IDEs to text editors

• Importance of using an IDE in Java development

• Popular IDEs for Java development

• Downloading and installing IntelliJ IDEA

• Creating a new project in the IntelliJ IDEA

• Writing and executing a simple Java program

• Explanation of what data types and variables are

• Importance of understanding data types and variables in programming

• Explanation of primitive data types and their uses

• Integer data types (byte, short, int, long)

• Floating-point data types (float, double)

• Character and boolean data types

• Demonstration of how to declare and initialize variables of different primitive data types

• Casting

• Explanation of non-primitive data types (String, arrays, classes)

• Comparison of primitive and non-primitive data types

• Demonstration of how to declare and initialize variables of non-primitive data types

This quiz covers the fundamental concepts of non-primitive data types in Java, focusing on Strings, arrays, and classes, as well as differences between primitive and non-primitive types.

• Explanation of variable naming conventions in Java

• Explanation of variable scope

• Demonstration of how variable scope affects program behavior

This quiz covers the key concepts of variable naming conventions and scope in Java, ensuring a better understanding of best practices for variable names and the different scopes that affect variable accessibility.

• Using the System.out.print() and System.out.println() methods to write to the console

• Examples of writing different data types to the console

• Formatting output with printf() method

This quiz covers the essential concepts of writing to the console in Java, focusing on the use of System.out.print(), System.out.println(), and System.out.printf() methods.

• Using the Scanner class to read input from the console

• Examples of reading different data types from the console

This quiz covers the essential concepts of reading input from the console using the Scanner class in Java, focusing on correct usage and exception handling.

• Arithmetic operators (e.g. +, -, *, /)

• Comparison operators (e.g. ==, !=, >, <)

• Logical operators (e.g. &&, ||, !)

• Assignment operators (e.g. =, +=, -=)

This quiz covers the essential concepts of operators in Java, focusing on arithmetic, comparison, logical, and assignment operators.

• Understanding operator precedence in expressions

• Examples of how operator precedence affects the outcome of an expression

This quiz covers the essential concepts of operator precedence in Java, ensuring a better understanding of how different operators are prioritized in expressions.

• Common mistakes when using operators and expressions

• Best practices for writing clear and efficient code using operators and expressions

This quiz covers common pitfalls and best practices in Java programming, focusing on correct usage of operators, proper string declaration, order of operations, and improving code readability and maintainability.

• Syntax and usage of if-else statements

• Example of if-else statements in Java code

• Nesting of if-else statements

This quiz covers the essential concepts of if-else statements in Java, focusing on correct syntax, nesting, and if-else ladder usage.

• Syntax and usage of switch statements

• Example of switch statements in Java code

• Differences between switch and if-else statements

This quiz covers the essential concepts of switch statements in Java, focusing on correct syntax, usage, and differences from if-else statements.

• Types of loops in Java (for, while, do-while)

• Syntax and usage of each loop type

• Examples of loops in Java code

• Usage of break and continue

• Tips for efficient looping

This quiz covers the essential concepts of loops in Java, focusing on for, while, and do-while loops, as well as the break and continue statements.

• Definition of a method in Java

• Syntax of declaring a method in Java

• Types of methods (void, non-void)

• Defining parameters for a method

• Return types of methods

• Method overloading

• Method invocation

• Parameter passing mechanism in Java

• Recursive methods

• Varargs in the methods

This quiz covers the essential concepts of methods in Java, focusing on declaration, invocation, overloading, recursion, and varargs.

• Creating and initializing arrays

• Accessing and modifying array elements

• Iterating through arrays

• Common methods for arrays (length, sort, etc.)

• Multidimensional arrays

This quiz covers the essential concepts of arrays in Java, focusing on declaration, initialization, accessing elements, modifying elements, common methods, and multidimensional arrays.

• Overview of the concept of strings in Java

• Differences between string literals and string objects

This quiz covers the essential concepts of strings in Java, focusing on creation, comparison, and important methods such as length() and equals().

• String methods such as length(), charAt(), indexOf()

• Immutability of strings and its implications

This quiz covers the essential concepts of string objects in Java, focusing on common methods, immutability, and string interning.

• Using the + operator for concatenation

• Using the StringBuilder and StringBuffer classes for concatenation

This quiz covers the essential concepts of string concatenation in Java, focusing on the + operator, StringBuilder, and StringBuffer classes.

• Compare strings using the equals() and equalsIgnoreCase() methods

• Compare strings using the == operator and the compareTo() method

This quiz covers the essential concepts of string comparison in Java, focusing on the equals(), equalsIgnoreCase(), ==, and compareTo() methods.

• Syntax and usage of the String.format() method

• Examples of formatting strings using placeholders and format specifiers

This quiz covers the essential concepts of string formatting using the String.format() method in Java, focusing on format specifiers and their usage.

• Understanding of string pool concept

• How string pool works in Java

This quiz covers the essential concepts of the string pool in Java, focusing on string creation, comparison, and the use of the intern() method.