1. write a tostring method for this class. the method should return a string containing the radius and area of the circle.

2. write an equals method for this class. the method should accept a circle object as an argument. it should return true if the argument object contains the same data as the calling object, or false otherwise.

3. write a greaterthan method for this class. the method should accept a circle object as an argument. it should return true if the argument object has an area that is greater than the area of the calling object, or false otherwise.

this is what i have but i have one error that i can't figure out how to fix: the error is line 3, where it says private double radius. when i use the suggested fix on netbeans (which changes it to private final double radius) i just another error saying illegal use of expression or something. can someone

public class circle {
{
private double radius;

public circle(double r)
{
radius = r;
}

public double getarea()
{
return math. pi * radius * radius;
}

public double getradius()
{
return radius;
}

public string tostring()
{
string str;
str = "radius: " + radius +
"area: " + getarea();
return str;
}

public boolean equals(circle c)
{
boolean status;

if(c. getradius() == radius)
status = true;
else
status = false;

return status;
}

public boolean greaterthan(circle c)
{
boolean status;

if(c. getarea() >
status = true;
else
status = false;

return status;
}
}

public class Circle {

private double radius;

public Circle(double r)

{

radius = r;

}

public double getArea()

{

return Math.PI * radius * radius;

}

public double getRadius()

{

return radius;

}

public String toString()

{

String str;

str = "Radius: " + radius +

"Area: " + getArea();

return str;

}

public boolean equals(Circle c)

{

boolean status;

if(c.getRadius() == radius)

status = true;

else

status = false;

return status;

}

public boolean greaterThan(Circle c)

{

boolean status;

if(c.getArea() > getArea())

status = true;

else

status = false;

return status;

}

}

Explanation:

There is nothing with the logic of your code it work fine the problem is with the structure of your code you added an extra  curly brace before declaring (r)

Am talking about this section

public class Circle {

{

private double radius;

  It should be    

public class Circle {

private double radius;

we can all learn from our past mistakes because we all have different ways of learning different types of techniques. my way may or may not another classmate remember and have the repetition to acknowledge such standard. such as remembering acronyms. using abbreviations to us remember keep things in order in our memory. this us figure out what comes next in the sequence. if so, what we have is a sentence of just letters all in caps. we either know the meaning or have no idea what it stands for. most of the time we know the meaning and context. but most of us who don't know, should learn by having a quick glance at what needs to be remembered. such as repetition in the memory for acronyms. one way that me, is the fact that i'm always doing math and english assignments. so we have to remember specific meanings such as soapstone for documents, such as citing correctly. or pemdas for doing the equations correctly, even if it's the super long way. this works for everyone. you just have to find what works for you by practicing and repetition daily.