JDK, JRE, and JVM difference in Java - Mini Project: Build & Apply

Understanding JDK, JRE, and JVM Differences

📖 Scenario: Imagine you want to run a Java program on your computer. To do this, you need some tools that help you write, compile, and run Java code. These tools are called JDK, JRE, and JVM. Understanding how they work together is like knowing the roles of a chef, kitchen, and stove when cooking a meal.

🎯 Goal: You will create simple Java code snippets and comments to explain the difference between JDK, JRE, and JVM. This will help you understand what each part does in the process of running a Java program.

📋 What You'll Learn

Create a Java class with comments explaining JDK, JRE, and JVM

Declare variables representing JDK, JRE, and JVM with simple descriptions

Write a method that prints these descriptions

Run the program to see the output explaining the differences

💡 Why This Matters

🌍 Real World

Knowing the difference between JDK, JRE, and JVM helps you set up your computer correctly to write and run Java programs.

💼 Career

Software developers and engineers must understand these tools to develop, test, and deploy Java applications efficiently.

1

Create a Java class with variables for JDK, JRE, and JVM

Create a public class called JavaEnvironment. Inside it, declare three String variables named jdk, jre, and jvm. Assign them these exact values: "Java Development Kit" for jdk, "Java Runtime Environment" for jre, and "Java Virtual Machine" for jvm.

Java

public class JavaEnvironment {
    // Your code here
}

Need a hint?

Remember to declare the class and variables exactly as instructed.

2

Add descriptions for JDK, JRE, and JVM

Inside the JavaEnvironment class, add three more String variables named jdkDescription, jreDescription, and jvmDescription. Assign them these exact values: "Contains tools to develop Java programs" for jdkDescription, "Contains libraries and JVM to run Java programs" for jreDescription, and "Executes Java bytecode" for jvmDescription.

Java

public class JavaEnvironment {
    String jdk = "Java Development Kit";
    String jre = "Java Runtime Environment";
    String jvm = "Java Virtual Machine";
    // Your code here
}

Need a hint?

Add the description variables exactly as shown.

3

Create a method to print the descriptions

Inside the JavaEnvironment class, create a public method called printDescriptions that returns void. Inside this method, use System.out.println to print each variable and its description in this exact format: "JDK: " + jdk + " - " + jdkDescription, similarly for jre and jvm.

Java

public class JavaEnvironment {
    String jdk = "Java Development Kit";
    String jre = "Java Runtime Environment";
    String jvm = "Java Virtual Machine";
    String jdkDescription = "Contains tools to develop Java programs";
    String jreDescription = "Contains libraries and JVM to run Java programs";
    String jvmDescription = "Executes Java bytecode";

    // Your code here
}

Need a hint?

Write the method exactly as instructed to print all descriptions.

4

Create main method and print the output

Add a public static void main(String[] args) method inside the JavaEnvironment class. Inside it, create an object of JavaEnvironment named env. Then call the printDescriptions() method on env to display the descriptions.

Java

public class JavaEnvironment {
    String jdk = "Java Development Kit";
    String jre = "Java Runtime Environment";
    String jvm = "Java Virtual Machine";
    String jdkDescription = "Contains tools to develop Java programs";
    String jreDescription = "Contains libraries and JVM to run Java programs";
    String jvmDescription = "Executes Java bytecode";

    public void printDescriptions() {
        System.out.println("JDK: " + jdk + " - " + jdkDescription);
        System.out.println("JRE: " + jre + " - " + jreDescription);
        System.out.println("JVM: " + jvm + " - " + jvmDescription);
    }

    // Your code here
}

Need a hint?

Make sure to create the main method, instantiate the class, and call the printDescriptions method.