Implement a toString method for the following class that returns a string containing the class name and the names and values of all instance variables.

public class Point

$\{$

private int x;

private int y;

$...$

$\}$

For example,

Point origin $=$ new Point$(0,0)$;

String str $=$ origin.toString$()$;

should set str to the string

Point$[$x$=0,$y$=0]$

Not all lines are useful.