JAVA Programming Implement the equals method of the Arrow class. Two arrows are

Question

JAVA Programming

Implement the equals method of the Arrow class. Two arrows are equal when they have the same starting point and direction.

------(Only can work at "Work here"

Arrow.JAVA

public class Arrow
{
private int x;
private int y;
private String direction;

/**
Constructs an arrow.
@param x the x-position
@param y the y-position
@param direction a compass direction N E S W NE NW SE SW
*/
public Arrow(int x, int y, String direction)
{
this.x = x;
this.y = y;
this.direction = direction;
}

/**
Checks whether this arrow is equal to another.
@param otherObject another arrow
@return true if this arrow and otherObject have the
same position and direction.
*/
public boolean equals(Object otherObject)
{
"Work Here"

}
}

------

Arrowtester.JAVA

public class ArrowTester
{
public static void main(String[] args)
{
Arrow arrow1 = new Arrow(1, 2, "SE");
Object arrow2 = new Arrow(1, 2, "W");
Arrow arrow3 = new Arrow(1, 0, "SE");
Arrow arrow4 = new Arrow(0, 2, "SE");
Arrow arrow5 = new Arrow(1, 2, "SEE".substring(0, 2));

System.out.println(arrow1.equals(arrow1));
System.out.println("Expected: true");
System.out.println(arrow1.equals(arrow2));
System.out.println("Expected: false");
System.out.println(arrow1.equals(arrow3));
System.out.println("Expected: false");
System.out.println(arrow1.equals(arrow4));
System.out.println("Expected: false");
System.out.println(arrow1.equals(arrow5));
System.out.println("Expected: true");
}
}

Explanation / Answer

Hi,

I have implemented equals method and highlighted the code changes beow.

Arrow.java

public class Arrow
{
private int x;
private int y;
private String direction;
/**
Constructs an arrow.
@param x the x-position
@param y the y-position
@param direction a compass direction N E S W NE NW SE SW
*/
public Arrow(int x, int y, String direction)
{
this.x = x;
this.y = y;
this.direction = direction;
}
/**
Checks whether this arrow is equal to another.
@param otherObject another arrow
@return true if this arrow and otherObject have the
same position and direction.
*/
public boolean equals(Object otherObject)
{
   Arrow a = (Arrow)otherObject;
   if(x == a.x && y == a.y && direction.equals(a.direction)){
       return true;
   }
   else{
       return false;
   }
}
}

public class ArrowTester
{
public static void main(String[] args)
{
Arrow arrow1 = new Arrow(1, 2, "SE");
Object arrow2 = new Arrow(1, 2, "W");
Arrow arrow3 = new Arrow(1, 0, "SE");
Arrow arrow4 = new Arrow(0, 2, "SE");
Arrow arrow5 = new Arrow(1, 2, "SEE".substring(0, 2));
System.out.println(arrow1.equals(arrow1));
System.out.println("Expected: true");
System.out.println(arrow1.equals(arrow2));
System.out.println("Expected: false");
System.out.println(arrow1.equals(arrow3));
System.out.println("Expected: false");
System.out.println(arrow1.equals(arrow4));
System.out.println("Expected: false");
System.out.println(arrow1.equals(arrow5));
System.out.println("Expected: true");
}
}

Output:

true
Expected: true
false
Expected: false
false
Expected: false
false
Expected: false
true
Expected: true

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