Hackerrank Java Map Solution

Solution in java8

Approach 1.

//Complete this code or write your own from scratch
import java.util.*;
import java.io.*;

class Solution{
	public static void main(String []argh)
	{
        Map<String, Integer> mp = new HashMap<>();
		Scanner in = new Scanner(System.in);
		int n=in.nextInt();
		in.nextLine();
		for(int i=0;i<n;i++)
		{
			String name=in.nextLine();
			int phone=in.nextInt();
			in.nextLine();
            mp.put(name, phone);
		}
		while(in.hasNext())
		{
			String s=in.nextLine();
            if(mp.containsKey(s))
                System.out.println(s+"="+mp.get(s));
            else
                System.out.println("Not found");
		}
	}
}

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Approach 2.

//Complete this code or write your own from scratch
import java.util.*;
import java.io.*;

class Solution{
	public static void main(String []argh)
	{
	    Scanner in = new Scanner(System.in);
        int n=in.nextInt();
        in.nextLine();
        Map<String, Integer> map =new HashMap<>();
        for(int i=0;i<n;i++)
        {
            String name=in.nextLine();
            int phone=in.nextInt();
            in.nextLine();

            map.put(name , phone);
        }
        while(in.hasNext())
        {
            String s=in.nextLine();
            if(map.containsKey(s)){
                System.out.println(s+"="+ map.get(s));
            }
            else{
                System.out.println("Not found");
            }
        }
	}
}

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Approach 3.

//Complete this code or write your own from scratch
import java.util.*;
import java.io.*;

class Solution{
	public static void main(String[]args){
        Scanner in = new Scanner(System.in);
        int n=in.nextInt();
        in.nextLine();
        HashMap<String, Integer> hash = new HashMap<String, Integer>();
        for(int i=0;i<n;i++){
            String name= in.nextLine();
            int phone = in.nextInt();
            hash.put(name,phone);
            in.nextLine();

        }

        while(in.hasNext())
        {
            String s=in.nextLine();

            try {
                int temp = hash.get(s);
                System.out.println(s+"=" + temp);
            } catch (NullPointerException e) {
                System.out.println("Not found");
            }
        }
    }
}

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