I can\'t figure out how to do this coding. Help please, and thank you for you ti

Question

I can't figure out how to do this coding. Help please, and thank you for you time!

import java.util.HashMap;

/**
* Create a hash table of 2D points and their annotations.
*
* For each point there is string representing an annotation for
* that point in an image.
*
*
*/
public class Point2DHashTable {
/** Output the annotation for a given 2D point
*
* @param key is the 2D point
* @param annotationMap is a map of annotation string for a set of points
*/
public static void displayAnnotation(Point2D key, HashMap<Point2D, String> annotationMap){
// TODO: display annotation for given 2D point
// if point is not in hash table, display message stating that it has no annotation
}
  
/** Test the equals and hashCode implementations in Point2D
* @param args is an array of command line arguments
*/
public static void main(String[] args) {
// TODO: Create hash map of Point2D objects with their annotations as keys
  
// TODO: Insert points and corresponding strings into table
  
displayAnnotation(new Point2D(467, 33), annotationMap); // should succeed
displayAnnotation(new Point2D(35, 35), annotationMap); // does not have an entry in table
  
}
  
}

Explanation / Answer

import java.io.*;
import java.util.*;

class point2D{
    int x;
    int y;
    public point2D(int x,int y){
        this.x = x;
        this.y = y;
    }
}

class main{
    public static void displayAnnotation(Point2D key, HashMap<Point2D, String> annotationMap){
        if (annotationMap.containsKey(key) == true)
            System.out.println(annotationMap.get(key));
        else
            System.out.println("NO IT IS NOT IN HASHMAP");
        System.out.println();
    }
    public static void main(String[] args){
        HashMap<point2D,String> annotationMap = new HashMap<point2D,String>();
        hm.put(new point2D(467,33),"YES IT IS IN HASHMAP");

        displayAnnotation(new Point2D(467, 33), annotationMap);   // should succeed
        displayAnnotation(new Point2D(35, 35), annotationMap);    // does not have an entry in table
    }
}

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