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In this post, you will find the solution for Java Lambda Expressions-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.
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Java is a class-based, object-oriented programming language and is designed to have as few implementation dependencies as possible. A general-purpose programming language made for developers to write once run anywhere that is compiled Java code can run on all platforms that support Java. Java applications are compiled to byte code that can run on any Java Virtual Machine. The syntax of Java is similar to c/c++.
Link for the Problem – Java Lambda Expressions – Hacker Rank Solution
Java Lambda Expressions – Hacker Rank Solution
This Java 8 challenge tests your knowledge of Lambda expressions!
Write the following methods that return a lambda expression performing a specified action:
- PerformOperation isOdd(): The lambda expression must return if a number is odd or if it is even.
- PerformOperation isPrime(): The lambda expression must return if a number is prime or if it is composite.
- PerformOperation isPalindrome(): The lambda expression must return if a number is a palindrome or if it is not.
Input Format
Input is handled for you by the locked stub code in your editor.
Output Format
The locked stub code in your editor will print lines of output.
Sample Input
The first line contains an integer, (the number of test cases).
The subsequent lines each describe a test case in the form of space-separated integers:
The first integer specifies the condition to check for ( for Odd/Even, for Prime, or for Palindrome). The second integer denotes the number to be checked.
5 1 4 2 5 3 898 1 3 2 12
Sample Output
EVEN PRIME PALINDROME ODD COMPOSITE
Java Lambda Expressions – Hacker Rank Solution
import java.io.*;
import java.util.*;
interface PerformOperation {
boolean check(int a);
}
class MyMath {
public static boolean checker(PerformOperation p, int num) {
return p.check(num);
}
PerformOperation isOdd()
{
PerformOperation po = (int a)-> a%2 == 0 ? false : true;
return po;
}
PerformOperation isPrime()
{
PerformOperation po = (int a)->
{
if(a == 1) return true;
else
{
for (int i = 2; i < Math.sqrt(a); i++)
if(a%i == 0) return false;
return true;
}
};
return po;
}
PerformOperation isPalindrome()
{
ArrayList<Integer> aa = new ArrayList<>();
PerformOperation po = (int a)->
{
String str = Integer.toString(a);
String reverse = "";
for(int i = str.length()-1; i >= 0; i--)
{
reverse = reverse + str.charAt(i);
}
if(reverse.equals(str)) return true;
return false;
};
return po;
}
}
public class Solution {
public static void main(String[] args) throws IOException {
MyMath ob = new MyMath();
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int T = Integer.parseInt(br.readLine());
PerformOperation op;
boolean ret = false;
String ans = null;
while (T--> 0) {
String s = br.readLine().trim();
StringTokenizer st = new StringTokenizer(s);
int ch = Integer.parseInt(st.nextToken());
int num = Integer.parseInt(st.nextToken());
if (ch == 1) {
op = ob.isOdd();
ret = ob.checker(op, num);
ans = (ret) ? "ODD" : "EVEN";
} else if (ch == 2) {
op = ob.isPrime();
ret = ob.checker(op, num);
ans = (ret) ? "PRIME" : "COMPOSITE";
} else if (ch == 3) {
op = ob.isPalindrome();
ret = ob.checker(op, num);
ans = (ret) ? "PALINDROME" : "NOT PALINDROME";
}
System.out.println(ans);
}
}
}
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