What is the order of HashSet?

It means that HashSet does not maintains the order of its elements. Hence sorting of HashSet is not possible. However, the elements of the HashSet can be sorted indirectly by converting into List or TreeSet, but this will keep the elements in the target type instead of HashSet type.

geeksforgeeks.org - How to sort HashSet in Java - GeeksforGeeks

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Given a HashSet in Java, the task is to sort this HashSet.

Examples:

Input: HashSet: [Geeks, For, ForGeeks, GeeksforGeeks] Output: [For, ForGeeks, Geeks, GeeksforGeeks] Input: HashSet: [2, 5, 3, 1, 4] Output: [1, 2, 3, 4, 5] The HashSet class implements the Set interface, backed by a hash table which is actually a HashMap instance. No guarantee is made as to the iteration order of the set which means that the class does not guarantee the constant order of elements over time. It means that HashSet does not maintains the order of its elements. Hence sorting of HashSet is not possible. However, the elements of the HashSet can be sorted indirectly by converting into List or TreeSet, but this will keep the elements in the target type instead of HashSet type.

Below is the implementation of the above approach:

Program 1: By Converting HashSet to List.

import java.util.*; public class GFG { public static void main(String args[]) { HashSet set = new HashSet(); set.add( "geeks" ); set.add( "practice" ); set.add( "contribute" ); set.add( "ide" ); System.out.println( "Original HashSet: " + set); List list = new ArrayList(set); Collections.sort(list); System.out.println( "HashSet elements " + "in sorted order " + "using List: " + list); } } Output: Original HashSet: [practice, geeks, contribute, ide] HashSet elements in sorted order using List: [contribute, geeks, ide, practice]

Program 2: By Converting HashSet to TreeSet.

import java.util.*; public class GFG { public static void main(String args[]) { HashSet set = new HashSet(); set.add( "geeks" ); set.add( "practice" ); set.add( "contribute" ); set.add( "ide" ); System.out.println( "Original HashSet: " + set); TreeSet treeSet = new TreeSet(set); System.out.println( "HashSet elements " + "in sorted order " + "using TreeSet: " + treeSet); } } Output: Original HashSet: [practice, geeks, contribute, ide] HashSet elements in sorted order using TreeSet: [contribute, geeks, ide, practice]

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Can you reverse in neutral?

Accidentally shifting into neutral on your car shouldn't cause any damage to your vehicle. And fortunately, nothing should happen to your car if you shift into reverse while driving other than your car slowing down and some grinding of the gears. Newer cars come equipped with a reverse inhibitor.

getjerry.com - What happens if you shift into reverse while driving? - Jerry

Accidentally shifting into neutral on your car shouldn’t cause any damage to your vehicle. And fortunately, nothing should happen to your car if you shift into reverse while driving other than your car slowing down and some grinding of the gears. Newer cars come equipped with a reverse inhibitor. This is a safety feature that ignores the shift to reverse and keeps the car going forward until the car reaches a slower speed. However, older model vehicles (pre-2000) may not have a reverse inhibitor. If your car doesn’t have a reverse inhibitor, your car will either brake to a halt or the engine will stall. When the engine stalls, you won’t have control over acceleration or deceleration. That said, older models and newer models won’t let you move the gear shift into reverse unless you press the button on the stick shift.

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