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Java programming Exercises: Remove leading zeros from a given IP address

Java Regular Expression: Exercise-10 with Solution

Write a Java program to remove leading zeros from a given IP address.

Sample Solution:

Java Code:

import java.util.*;
public class test {
 
   public static void main(String[] args) {
	     
	    System.out.println(validate("216.08.094.196"));
		System.out.println(validate("08.008.0008.00008"));
		System.out.println(validate("01.102.103.104"));
        }

   public static String validate(String ip) {
          return ip.replaceAll("(?<=^|\\.)0+(?!\\.|$)","");
   }
}

Sample Output: 

216.8.94.196
8.8.8.8
1.102.103.104

Pictorial Presentation:

Java Regular Expression: Remove leading zeros from a given IP address.

Flowchart :

Flowchart: Remove leading zeros from a given IP address.

Java Code Editor:

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Java: Tips of the Day

What is the best way to filter a Java Collection?

Java 8 (2014) solves this problem using streams and lambdas in one line of code:

List<Person> beerDrinkers = persons.stream()
    .filter(p -> p.getAge() > 16).collect(Collectors.toList());

Use Collection#removeIf to modify the collection in place. (Notice: In this case, the predicate will remove objects who satisfy the predicate):

persons.removeIf(p -> p.getAge() <= 16);

lambdaj allows filtering collections without writing loops or inner classes:

List beerDrinkers = select(persons, having(on(Person.class).getAge(),
    greaterThan(16)));

Ref: https://bit.ly/3uwYid6