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HackerRank Solutions

This document contains summaries of and links to various Java challenges on HackerRank including Java exception handling using try-catch, the Java factory pattern, method overriding, hashsets, and comparators. It provides code snippets and summaries for challenges involving dividing numbers and handling different exception types, implementing a calculator class with exception handling, using a factory pattern to return different object types based on an order, overriding a method to print team details, adding string pairs to a hashset to find the unique pairs, and implementing a comparator to sort players by score then name.

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2K views4 pages

HackerRank Solutions

This document contains summaries of and links to various Java challenges on HackerRank including Java exception handling using try-catch, the Java factory pattern, method overriding, hashsets, and comparators. It provides code snippets and summaries for challenges involving dividing numbers and handling different exception types, implementing a calculator class with exception handling, using a factory pattern to return different object types based on an order, overriding a method to print team details, adding string pairs to a hashset to find the unique pairs, and implementing a comparator to sort players by score then name.

Uploaded by

Steven
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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Contenido

Java Exception Handling (Try-catch)...................................................................................................2

Java Exception Handling.....................................................................................................................2

Java Factory Pattern...........................................................................................................................3

Java Method Overriding.....................................................................................................................3

Java Hashset.......................................................................................................................................3

Java Comparator.................................................................................................................................3
Java Exception Handling (Try-catch)
https://www.hackerrank.com/challenges/java-exception-handling-try-catch/problem

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {


public static void main(String[] args) {
try{
Scanner scan=new Scanner(System.in);
int valA= scan.nextInt();
int valB=scan.nextInt();
System.out.println((valA/valB));
}catch(InputMismatchException e){
System.out.println(e.getClass().getName());
}catch(ArithmeticException e){
System.out.println(e);
}
}
}

Java Exception Handling


https://www.hackerrank.com/challenges/java-exception-handling/problem
class MyCalculator {
private static final String MSG_EXCEP_LESSS_ZERO="n or p should not be negative.";
private static final String MSG_EXCEP_EQUAL_ZERO="n and p should not be zero.";

public int power ( int n, int p) throws Exception{


if((n<0) || (p<0)){
throw new Exception(MSG_EXCEP_LESSS_ZERO);
}else if (n == 0 && p == 0) {
throw new Exception(MSG_EXCEP_EQUAL_ZERO);
}
return (int)Math.pow(n,p);
}
}
Java Factory Pattern
https://www.hackerrank.com/challenges/java-factory/problem

if (order.equals("cake"))
return new Cake();
else
return new Pizza();

Java Method Overriding


https://www.hackerrank.com/challenges/java-method-overriding/problem
@Override
void getNumberOfTeamMembers() {
System.out.println("Each team has 11 players in " + getName());
}

Java Hashset
https://www.hackerrank.com/challenges/java-hashset/problem

Set<String> setPairs = new HashSet<>();


for (int i = 0; i < t; i++) {
setPairs.add(pair_left[i] + " " + pair_right[i]);
System.out.println(setPairs.size());
}

Java Comparator
https://www.hackerrank.com/challenges/java-comparator/problem

HackerRank

class Checker implements Comparator<Player>{


@Override
public int compare(Player playerA, Player playerB) {
int resultScore = playerB.score - playerA.score;
if(resultScore == 0){
resultScore = playerA.name.compareTo(playerB.name);
}
return resultScore;
}
}

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