public class Rectangle {

    private double length, width;

    Rectangle() {
        this.length = 1;
        this.width = 1;
    }

    Rectangle(int width, int length) {
        if (isMeasureValid(width)) {
            this.width = width;
        }
        else {
            this.width = 1;
        }
        if (isMeasureValid(length)) {
            this.length = length;
        }
        else {
            this.length = 1;
        }
    }

    public double getPerimeter() {
        return ( (width*2) + (length*2) );
    }

    public double getArea() {
        return ( width * length );
    }

    public void setWidth(double width) {
        if (isMeasureValid(width)) {
            this.width = width;
        }
    }

    public void setLength(double length) {
        if (isMeasureValid(length)) {
            this.length = length;
        }
    }

    private boolean isMeasureValid(double length) {
        return length > 0 && length <= 20;
    }

    public double getWidth() {
        return this.width;
    }

    public double getLength() {
        return this.length;
    }

}