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Java Exercises: Get the value of the environment variable PATH, TEMP, USERNAME

Java Basic: Exercise-90 with Solution

Write a Java program to get the value of the environment variable PATH, TEMP, USERNAME.

Sample Solution:

Java Code:

import java.lang.*;
 public class Exercise90 {
 public static void main(String[] args)
 {
	  // gets the value of the specified environment variable "PATH"
      System.out.println("\nEnvironment variable PATH: ");
      System.out.println(System.getenv("PATH"));

      // gets the value of the specified environment variable "TEMP"
      System.out.println("\nEnvironment variable TEMP: ");
      System.out.println(System.getenv("TEMP"));

      // gets the value of the specified environment variable "USERNAME"
      System.out.println("\nEnvironment variable USERNAME: ");
      System.out.println(System.getenv("USERNAME"));
  }
}

Sample Output: 

Environment variable PATH:                                             
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
:/usr/local/games                                                      
                                                                       
Environment variable TEMP:                                             
null                                                                   
                                                                       
Environment variable USERNAME:                                         
null

Flowchart:

Flowchart: Java exercises: Get the value of the environment variable PATH, TEMP, USERNAME

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