Having some problems with some computer science homework.

I bolded two of the answers that I'm stuck between. Please help, thank you!!

Questions 18 - 19 pertain to the following class, Point:

public class Point {

private double x;

private double y;

public Point() {

this (0, 0);

}

public Point(double a, double b) {

/* missing code */

}

// ... other methods not shown

}

Which of the following correctly implements the equals method?

public boolean equals(Point p) {

return (x == Point.x && y == Point.y);

}

public void equals(Point p) {

System.out.println(x == p.x && y == p.y);

}

public boolean equals(Point p) {

System.out.println(x == p.x && y == p.y);

}

public boolean equals(Point p) {

return (x == p.x && y == p.y );

}

public void equals(Point p) {

return (x == p.x && y == p.y );

}

The default constructor sets x and y to (0, 0) by calling the second constructor. What could be used to replace /* missing code */ so that this works as intended?

a = 0;

b = 0;

this(0, 0);

this (x, y);

a = x;

b = y;

x = a;

y = b;