Java Cheat Codes: Most Popular Functions

Course details

Java methods (also known as Java functions) allow you to write cleaner, more concise code and solve common programming tasks. Many Java beginners struggle to memorize and effectively utilize the vast array of methods available in the Java library. In this course, engineer and instructor Semirah Dolan provides a focused and practical approach to learning the most popular and versatile Java methods, empowering you to write cleaner, more concise code and solve common programming tasks with confidence.

Learning objectives
Identify and apply the most useful Java methods for various programming tasks.
Write cleaner, more concise and efficient code.
Solve common programming problems with confidence.
Become a more efficient and productive Java developer.

Concepts

Introduction

Java methods
What you should know
CoderPad tour
Using GitHub Codespaces

Introduction to Java Methods

Classes and methods
Defining methods
Naming methods
Method parameters
Method overloading
Java scope
Method declaration
Types of methods - Predefined and user-defined

Object Class

Solution - equals(Object obj)
Solution - toString()
Challenge - hashCode()
Solution - hashCode()
Challenge - toString()getClass()
Solution - toString()getClass()

String Class

Challenge - toCharArray()
Solution - toCharArray()
Challenge - trim()
Solution - trim()
Challenge - valueOf(char data)
Solution - valueOf(char data)

Math Class

Solution - Math.abs(double number)
Challenge - Math.sqrt(double number)
Solution - Math.sqrt(double number)
Challenge - Math.pow(double base, double exponent)
Solution - Math.pow(double base, double exponent)
Challenge - Math.round(double number)
Solution - Math.round(double number)
Challenge - Math.max(double number1, double number2)
Solution - Math.max(double number1, double number2)
Challenge - Math.min(double number1, double number2)
Solution - Math.min(double number1, double number2)

Advanced Java Method Example

Solution - ArrayList.add(Object obj)

Conclusion

Where to go next