Java: Check whether Java is installed on your computer

Java Basic: Exercise-31 with Solution

Write a Java program to check whether Java is installed on your computer.

Pictorial Presentation:

Sample Solution:

Java Code:

public class Exercise31 {
    public static void main(String[] args) {
        // Display Java version
        System.out.println("\nJava Version: " + System.getProperty("java.version"));
        
        // Display Java runtime version
        System.out.println("Java Runtime Version: " + System.getProperty("java.runtime.version"));
        
        // Display Java home directory
        System.out.println("Java Home: " + System.getProperty("java.home"));
        
        // Display Java vendor name
        System.out.println("Java Vendor: " + System.getProperty("java.vendor"));
        
        // Display Java vendor URL
        System.out.println("Java Vendor URL: " + System.getProperty("java.vendor.url"));
        
        // Display Java class path
        System.out.println("Java Class Path: " + System.getProperty("java.class.path") + "\n");
    }
}

Explanation:

In the exercise above:

• It uses System.getProperty() to access and retrieve specific Java system properties.
• Finally, it prints the following information about the Java runtime environment:
• Java Version: The Java version installed on the system.
• Java Runtime Version: The Java Runtime Environment (JRE) used.
• Java Home: The directory path to the Java installation directory.
• Java Vendor: The Java runtime vendor or provider.
• Java Vendor URL: The Java vendor's URL or website.
• Java Class Path: The classpath, which specifies the directories and JAR files that the Java runtime should use when searching for classes and resources.

Sample Output:

Java Version: 1.8.0_71                                                                                        
Java Runtime Version: 1.8.0_71-b15                                                                            
Java Home: /opt/jdk/jdk1.8.0_71/jre                                                                           
Java Vendor: Oracle Corporation                                                                               
Java Vendor URL: http://java.oracle.com/                                                                      
Java Class Path: .

Flowchart:

Java Code Editor:

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