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Java Collection, PriorityQueue Exercises: Create a new priority queue, add some colors (string) and print out the elements of the priority queue

Java Collection, PriorityQueue Exercises: Exercise-1 with Solution

Write a Java program to create a new priority queue, add some colors (string) and print out the elements of the priority queue.

Sample Solution:-

Java Code:

import java.util.PriorityQueue;
public class Exercise1 {
  public static void main(String[] args) {
  PriorityQueue<String> queue=new PriorityQueue<String>();  
  queue.add("Red");
  queue.add("Green");
  queue.add("Orange");
  queue.add("White");
  queue.add("Black");
  System.out.println("Elements of the Priority Queue: ");
  System.out.println(queue);
 }
}

Sample Output:

Elements of the Priority Queue:                                        
[Black, Green, Orange, White, Red] 

Java Code Editor:

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Java: Tips of the Day

System.currentTimeMillis vs System.nanoTime

In Java, there are two standard ways of conducting time-operations and it is not always clear which one should be chosen.

The method System.currentTimeMillis() returns the current number of milliseconds since the beginning of the Unix era in the format Long. Its accuracy ranges from 1 to 15 thousandths of a second, depending on the system.

long startTime = System.currentTimeMillis();long estimatedTime = System.currentTimeMillis() - startTime;

The method System.nanoTime has an accuracy of up to one-millionth of a second (nanoseconds) and returns the current value of the most accurate available system timer.

long startTime = System.nanoTime();long estimatedTime = System.nanoTime() - startTime;

Thus, it is System.currentTimeMillisexcellent for displaying and synchronizing absolute time, and System.nanoTime for measuring relative intervals.

Ref: https://bit.ly/2W4V97w