array of points in java

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import java.awt.Point;

public interface PointList {

	static final int MAX_SIZE = 100;
	
	void append (Point newPoint); // Adds newPoint to the end of the list, 
	                              // Moves cursor to newPoint
	void clear();                 // Removes all points in the list

	boolean isEmpty();
	boolean isFull();
	
	boolean goToBeginning();      // If list is not empty moves the cursor to the first element of the list
	                              // and returns true. Otherwise, returns false.
	boolean goToEnd();            // If list is not empty moves the cursor to the last element of the list
                                  // and returns true. Otherwise, returns false.
	
	boolean goToNext();           // If the cursor is not in the last element of the list, 
	                              // moves it to the next element and returns true. Otherwise, returns false.
	boolean goToPrior();          // If the cursor is not in the first element of the list, 
                                  // moves it to the previous element and returns true. Otherwise, returns false.
	
	Point getCursor();            // Returns a copy of the point marked by the cursor, and null if the list is empty
	
	String toString();            // Outputs the Points in the list. If the list is empty, outputs "Empty list".
	                              // Intended for debugging purposes only.
}

Popularity 3/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: java points

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Contributed on Oct 31 2022

Mero

0 Answers Avg Quality 2/10

array of points in java

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import java.awt.*;


public class ArrayPointList implements PointList {
    private Point [] arr;
    private int actual_size ;
    private int cursor ;


    public ArrayPointList() {
        this.arr = new Point[MAX_SIZE];
        actual_size = 0;
        cursor = -1 ;


    }

    public ArrayPointList(int size) {
        this.arr = new Point[size];
        actual_size = 0;
    }


    @Override
    public void append(Point newPoint) {
        if(!isFull()){
            arr[actual_size] = new Point(newPoint);
            actual_size++;
            cursor = actual_size-1;
        }

    }

    @Override
    public void clear() {
        cursor = -1;
        actual_size = 0;
    }

    @Override
    public boolean isEmpty() {
        return actual_size == 0;
    }

    @Override
    public boolean isFull() {
        return actual_size == arr.length ;
    }

    @Override
    public boolean goToBeginning() {
        if(!isEmpty()) {
            cursor = 0;
            return true;
        }
        return false;
    }

    @Override
    public boolean goToEnd() {
        if(!isEmpty()) {
            cursor = actual_size-1 ;
            return true;
        }
        return false;
    }

    @Override
    public boolean goToNext() {
        if( (cursor < actual_size-1) ){
            cursor ++;
            return true;
        }
        return false;
    }

    @Override
    public boolean goToPrior() {
        if( (actual_size !=0) && (cursor>0) ){
            cursor --;
            return true;
        }
        return false;

    }

    @Override
    public Point getCursor() {
        if(isEmpty() ) return null;
        return new Point(arr[cursor]);
    }
}

Popularity 3/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: points java

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Contributed on Oct 31 2022

Mero

0 Answers Avg Quality 2/10

array of points in java

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import java.awt.*;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StreamTokenizer;


/** Editor Amir Ammar
 * Computer Science
 * Intro to Algorithms
**/
public class PointListCommandLine  {
    private final ArrayPointList arrayPoint;


    public PointListCommandLine() {
        this.arrayPoint = new ArrayPointList();
    }


    public void curr(){
        if (!arrayPoint.isEmpty()) {
            Point vertex = arrayPoint.getCursor();
            System.out.println("(" + vertex.x + ", " + vertex.y + ")");
        }
    }

    public void next(){System.out.println(arrayPoint.goToNext());}

    public void prev(){System.out.println(arrayPoint.goToPrior());}

    public void start(){
        System.out.println(arrayPoint.goToBeginning());
    }

    public void end(){System.out.println(arrayPoint.goToEnd());}

    public void empty(){
        System.out.println(arrayPoint.isEmpty());
    }

    public void full(){
       System.out.println(arrayPoint.isFull());
    }

    public void clear(){arrayPoint.clear();}




    public static void main(String[] args) throws IOException {
        PointListCommandLine arrayPoint = new PointListCommandLine();

        boolean done = false;
        InputStreamReader reader = new InputStreamReader(System.in);
        StreamTokenizer tokens = new StreamTokenizer(reader);
        while(!done){
            if(tokens.nextToken() == StreamTokenizer.TT_WORD){
                switch(tokens.sval){
                    case "quit":
                        done=true;
                        break;
                    case "add":
                        Point vertex;
                        vertex = new Point();
                        tokens.nextToken();
                        vertex.x = (int)tokens.nval;
                        tokens.nextToken();
                        vertex.y = (int)tokens.nval;
                        arrayPoint.arrayPoint.append(vertex);
                        break;
                    case "curr":
                        arrayPoint.curr();
                        break;
                    case "next":
                        arrayPoint.next();
                        break;
                    case "prev":
                        arrayPoint.prev();
                        break;
                    case "start":
                        arrayPoint.start();
                        break;
                    case "end":
                        arrayPoint.end();
                        break;
                    case "empty":
                        arrayPoint.empty();
                        break;
                    case "full":
                        arrayPoint.full();
                        break;
                    case "clear":
                        arrayPoint.clear();
                        break;
                }
            }

        }

    }

}

Popularity 2/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: points java

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Contributed on Oct 31 2022

Mero

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array of points in java

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