Question

All code is done using Java. The steps to the question are as follows (There is more information in the code comments posted below as well):

1. Begin by deciding how many fields are required and what their types should be. Add these fields to your class (making sure that they each have a private access modifier) giving them a sensible name when you do so.
2. Once you have added the fields to your class, implement the methods getLevel and getWidth. The JUnit tester requires these methods to test the constructors and other methods.
3. Implement the constructor HounsfieldWindow(int level, int width) first. Make sure that it has the correct access modifier and signature.
4. Implement the no-argument constructor HounsfieldWindow() next. Use constructor chaining to implement this constructor.
5. Implement the remaining methods making sure that they each have the correct access modifier, signature, and return type.

Remember to run the JUnit tester each time you complete a constructor or method, and to carefully study the result of the tests to help you through the development process.

Code and comments given:

/**

* A class that represents a windowed view of Hounsfield units. A Hounsfield

* window is defined by two values: (1) the window level, and (2) the window

* width. The window level is the Hounsfield unit value that the window is

* centered on. The window width is the range of Hounsfield unit values that the

* window is focused on.

*

* <p>

* A window has a lower and upper bound. The lower bound is defined as the

* window level minus half the window width:

*

* <p>

* lo = level - (width / 2)

*

* <p>

* The upper bound is defined as the window level plus half the window width:

*

* <p>

* hi = level + (width / 2)

*

* <p>

* Hounsfield units are mapped by the window to a real number in the range of

* {@code 0} to {@code 1}. A Hounsfield unit with a value less than lo is mapped

* to the value {@code 0}. A Hounsfield unit with a value greater than hi is

* mapped to the value {@code 1}. A Hounsfield unit with a value v between lo

* and hi is mapped to the value:

*

* <p>

* (v - lo) / width

*

*

*/

public class HounsfieldWindow {

}

Answer 1

public class HounsfieldWindow {
    private int level, width;

    public HounsfieldWindow(int level, int width) {
        this.level = level;
        this.width = width;
    }
    public HounsfieldWindow() {
        this(0, 400);  // Not sure what should be default values.
    }

    public int getLevel() {
        return level;
    }

    public int setLevel(int level) {
        if(level < Hounsfield.MIN_VALUE || level > Hounsfield.MAX_VALUE) {
            throw new IllegalArgumentException();
        }
        int data = this.level;
        this.level = level;
        return data;
    }

    public int getWidth() {
        return width;
    }

    public int setWidth(int width) {
        if(width <= 0) {
            throw new IllegalArgumentException();
        }
        int data = this.width;
        this.width = width;
        return data;
    }

    public double getLowerBound() {
        return level - (width / 2);
    }
    public double getUpperBound() {
        return level + (width / 2);
    }
    
    public double map(Hounsfield f) {
        
        int hounsfieldUnitVal = f.get();
        System.out.println("got " + hounsfieldUnitVal);
        if(hounsfieldUnitVal < getLowerBound()) {
            return 0;
        }
        if(hounsfieldUnitVal > getUpperBound()) {
            return 1;
        }
        return (hounsfieldUnitVal - getLowerBound()) / (double)width;
    }
}

**************************************************
You have not provided what the method names should be.. please change them if required as per your junit cases.

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