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Java Exercises: 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:

Java: Check whether Java is installed on your computer

Sample Solution:

Java Code:

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

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:

Flowchart: Java exercises: Check whether Java is installed on your computer

Java Code Editor:

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Java: Tips of the Day

countOccurrences

Counts the occurrences of a value in an array.

Use Arrays.stream().filter().count() to count total number of values that equals the specified value.

public static long countOccurrences(int[] numbers, int value) {
    return Arrays.stream(numbers)
            .filter(number -> number == value)
            .count();
}

Ref: https://bit.ly/3kCAgLb