On ECLIPSE using checkstyle requirements create a JUNIT Testing class for this c
ID: 3661963 • Letter: O
Question
On ECLIPSE using checkstyle requirements create a JUNIT Testing class for this circls class. be sure to have 100 percent coverage ( EclEmma code coverage tool) and correct imports. Also find out what the bug is! The unit tests must be written as JUnit 4 tests. class.
import java.awt.Color;
import java.awt.Point;
import java.util.Objects;
/**
* Represents a circle.
*
* <p>Invariant:
* <br>myRadius must be greater than zero
* <br>AND myCenter must not be null
* <br>AND myColor must not be null</p>
*
*/
public class Circle {
// class constants
/**
* A default radius to use when no other value is specified - (1.0 - a unit circle).
*/
private static final double DEFAULT_RADIUS = 1.0; // unit circle
/**
* A default Point for the center of a Circle - (0, 0) the coordinate system origin.
*/
private static final Point DEFAULT_CENTER = new Point(0, 0); // origin
/**
* A default Color to use when no other Color is specified - Color.BLACK.
*/
private static final Color DEFAULT_COLOR = Color.BLACK;
// instance fields
/**
* The radius of this Circle.
*/
private double myRadius;
/**
* The center of this Circle.
*/
private Point myCenter; // Note that java.awt.Point is mutable
/**
* The color of this Circle.
*/
private Color myColor;
// constructors
/**
* Constructs a Circle with the specified radius, location, and color.
*
* <p>Precondition: The parameters must not violate the class invariant.
* That is, theRadius must be greater than zero
* AND theCenter must not be null
* AND theColor must not be null</p>
*
* @param theRadius the radius to assign to this Circle
* @param theCenter the center point to assign to this Circle
* @param theColor the color to assign to this Circle
* @throws IllegalArgumentException if theRadius is less than or equal to zero
* @throws NullPointerException if theCenter is null OR theColor is null
*/
public Circle(final double theRadius,
final Point theCenter,
final Color theColor) {
if (theRadius <= 0) {
throw new IllegalArgumentException("The radius must be a positive value!");
}
myRadius = theRadius;
// make a defensive copy of the mutable Point parameter
// to avoid an encapsulation violation
myCenter = (Point) Objects.requireNonNull(theCenter).clone();
/*
* Note that the Objects class and requireNonNull() were added to Java in version 7.
* The method will throw an exception if the parameter passed to the method is null.
* This simplifies the code by eliminating the need for an if / else test
* and an explicit throws statement.
*/
myColor = Objects.requireNonNull(theColor);
}
/**
* Constructs a black unit circle centered at the origin.
*/
public Circle() {
this(DEFAULT_RADIUS, DEFAULT_CENTER, DEFAULT_COLOR);
}
// instance methods (commands)
/**
* Sets the radius of this Circle to the specified value.
*
* <p>Precondition: theRadius must be greater than zero</p>
* <p>Postcondition: this Circle will be assigned the specified radius</p>
*
* @param theRadius the radius value to assign to this Circle
* @throws IllegalArgumentException if theRadius is less than or equal to zero
*/
public final void setRadius(final double theRadius) {
if (theRadius <= 0) {
throw new IllegalArgumentException();
}
myRadius = theRadius;
}
/**
* Sets the location of the center of this Circle to the specified point.
*
* <p>Precondition: thePoint must not be null</p>
* <p>Postcondition: this Circle will be assigned the specified center Point</p>
*
* @param thePoint the center value to assign to this Circle
* @throws NullPointerException if thePoint is null
*/
public final void setCenter(final Point thePoint) {
// make a defensive copy of the mutable Point parameter
// to avoid an encapsulation violation
myCenter = (Point) Objects.requireNonNull(thePoint).clone();
}
/**
* Sets the Color of this Circle to the specified value.
*
* <p>Precondition: theColor must not be null</p>
* <p>Postcondition: this Circle will be assigned the specified Color</p>
*
* @param theColor the Color value to assign to this Circle
* @throws NullPointerException if theColor is null
*/
public final void setColor(final Color theColor) {
myColor = Objects.requireNonNull(theColor);
}
// instance methods (queries)
/**
* Returns the radius of this Circle.
*
* @return the radius of this Circle
*/
public final double getRadius() {
return myRadius;
}
/**
* Returns the center Point of this Circle.
*
* @return the center Point of this Circle
*/
public final Point getCenter() {
// return a defensive copy of the mutable Point field
// to avoid an encapsulation violation
return (Point) myCenter.clone();
}
/**
* Returns the Color of this Circle.
*
* @return the Color of this Circle
*/
public final Color getColor() {
return myColor;
}
/**
* Calculates and returns the diameter of this Circle.
*
* @return The diameter of this Circle
*/
public double calculateDiameter() {
return 2 * myRadius;
}
/**
* Calculates and returns the circumference of this Circle.
*
* @return the circumference of this Circle
*/
public double calculateCircumference() {
return Math.PI * calculateDiameter();
}
/**
* Calculates and returns the area of this Circle.
*
* @return the area of this Circle
*/
public double calculateArea() {
return 2 * myRadius * Math.PI;
}
// overridden methods from class Object
/**
* {@inheritDoc}
*
* The String representation of this Circle will be formatted as follows:
* <br>Circle [radius=(current value), center=(current value), color=(current value)].
*/
@Override
public String toString() {
final StringBuilder builder = new StringBuilder(128); // default initial size = 16
builder.append(getClass().getSimpleName()); // the class name without the package name
builder.append(" [radius=");
builder.append(String.format("%.2f", myRadius));
builder.append(", center=");
builder.append(myCenter);
builder.append(", color=");
builder.append(myColor);
builder.append(']');
return builder.toString();
}
}
Explanation / Answer
Version 1.8
Version 1.7
Version 1.6
Version 1.5
Version 1.4
Version 1.3
Version 1.2
Version 1.1
Version 1.0
or you can use a wildcard pattern if you use the @SuiteClasses annotation of JUnit Toolbox:
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