So i have this project in Java and I am honestly struggling and confused ...

For this part you will implement a simple class (named Point) representing a point in two-dimensional space. Do this by creating a new file named: Point.java and put all code specified below. This class must support the following operations (including a single constructor).

public Point(double x, double y)

Constructor.

public double getX()

Returns the x-coordinate of this point.

public double getY()

Returns the y-coordinate of this point.

public double getRadius()

Returns the distance from the origin to the point.

public double getAngle()

Returns the angle (in radians) from the x-axis in the in range of -pi to pi.

public Point rotate90()

Returns a newly created Point representing a 90-degree (counterclockwise) rotation of this point about the origin. Consider drawing a picture for a point not on an axis as a guide for how you might implement this operation (hint: there is a solution that does not require any sophisticated computations).

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This is the Testfile that is mentioned ....

import java.lang.reflect.Method; import java.lang.reflect.Modifier; import java.util.function.Predicate; import java.util.stream.Collectors; import java.util.Arrays; import java.util.List; import java.util.Map;

import static org.junit.Assert.assertArrayEquals; import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertTrue; import static org.junit.Assert.fail; import org.junit.Test;

public class TestCases { public static final double DELTA = 0.00001;

/* * This test is just to get you started. */ @Test public void testGetX() { assertEquals(1.0, new Point(1.0, 2.0).getX(), DELTA); }

/* * The tests below here are to verify the basic requirements regarding * the "design" of your class. These are to remain unchanged. */

@Test public void testImplSpecifics() throws NoSuchMethodException { final List expectedMethodNames = Arrays.asList( "getX", "getY", "getRadius", "getAngle", "rotate90" );

final List expectedMethodReturns = Arrays.asList( double.class, double.class, double.class, double.class, Point.class );

final List expectedMethodParameters = Arrays.asList( new Class[0], new Class[0], new Class[0], new Class[0], new Class[0] );

verifyImplSpecifics(Point.class, expectedMethodNames, expectedMethodReturns, expectedMethodParameters); }

private static void verifyImplSpecifics( final Class clazz, final List expectedMethodNames, final List expectedMethodReturns, final List expectedMethodParameters) throws NoSuchMethodException { assertEquals("Unexpected number of public fields", 0, Point.class.getFields().length);

final List publicMethods = Arrays.stream( clazz.getDeclaredMethods()) .filter(m -> Modifier.isPublic(m.getModifiers())) .collect(Collectors.toList());

assertEquals("Unexpected number of public methods", expectedMethodNames.size(), publicMethods.size());

assertTrue("Invalid test configuration", expectedMethodNames.size() == expectedMethodReturns.size()); assertTrue("Invalid test configuration", expectedMethodNames.size() == expectedMethodParameters.size());

for (int i = 0; i < expectedMethodNames.size(); i++) { Method method = clazz.getDeclaredMethod(expectedMethodNames.get(i), expectedMethodParameters.get(i)); assertEquals(expectedMethodReturns.get(i), method.getReturnType()); }

// verify that fields are final final List nonFinalFields = Arrays.stream( clazz.getDeclaredFields()) .filter(f -> !Modifier.isFinal(f.getModifiers())) .collect(Collectors.toList());

assertEquals("Unexpected non-final fields", 0, nonFinalFields.size()); } }