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public double xIntercept() { if (isHorizontal()) { throw new RuntimeException("this line is horizontal"); } return -b/m; } public double yIntercept() { if (isVertical()) { throw new RuntimeException("this line is vertical"); } return b; } }
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public class MyCircle implements Circle { private Point c; // center private double r; // radius public MyCircle() { } public MyCircle(Point c, double r) { this.c = c; this.r = r; } public double area() { return Math.PI*r*r; } public Point center() { return c; } public double circumference() { return 2*Math.PI*r; } public boolean contains(Point point) { double x = point.xCoordinate(); double y = point.yCoordinate(); return x*x + y*y < r*r; } public boolean equals(Object object) { if (object==this) { return true; } else if (!(object instanceof MyCircle)) { return false; } MyCircle that = (MyCircle)object; return (that.c == this.c && that.r == this.r); } public double radius() { return r; }
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European Article Number 13 Drawer In Visual Basic .NET
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public String toString() { return String.format("[Center: %.2fx; Radius: %.2f]", c, r); } }
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public class MyPolynomial implements Polynomial { private double[] c; // coefficients public MyPolynomial(double[] a) { // a[i] = coeffficient of x^i int n = c.length; c = new double[n]; System.arraycopy(a, 0, c, 0, n); } public int degree() { return c.length - 1; } public Polynomial derivative() { double da[] = new double[c.length-1]; for (int i=0; i<da.length; i++) { da[i] = (i+1)*c[i+1]; } return new MyPolynomial(da); } public boolean equals(Object object) { if (object==this) { return true; } else if (!(object instanceof MyPolynomial)) { return false; } MyPolynomial that = (MyPolynomial)object; return java.util.Arrays.equals(that.c, this.c); } public Polynomial sum(Polynomial p) { if (!(p instanceof MyPolynomial)) { throw new IllegalArgumentException("use a MyPolynomial object"); } MyPolynomial that = (MyPolynomial)p; double[] pc = that.c; int n = Math.max(c.length, pc.length); MyPolynomial q = new MyPolynomial(new double[n]); for (int i=0; i<n; i++) { q.c[i] = c[i] + pc[i]; } return q; } public String toString() { StringBuilder buf = new StringBuilder(); int n = c.length; if (n > 0 && c[0] != 0.0) { buf.append(c[0]); } if (n > 1 && c[1] != 0.0) { buf.append(String.format(" + %.2f", c[1])); }
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for (int i=2; i<n; i++) { if (c[i] != 0.0) { buf.append(String.format(" + %.2f^%d", c[i], i)); } } return buf.toString(); } public double valueAt(double x) { double y = 0.0; for (int i=0; i<c.length; i++) { y += c[i]*Math.pow(x, i); } return y; } }
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Arrays
An array is an object that consists of a sequence of elements that are numbered 0, 1, 2, . . . The element numbers are called index numbers. Array elements can be accessed by their index numbers using the subscript operator [], as a[0], a[1], a[2], and so on. Arrays are widely used because they are so efficient. PROPERTIES OF ARRAYS Here are the main properties of arrays in Java: 1. Arrays are objects. 2. Arrays are created dynamically (at run time). 3. Arrays may be assigned to variables of type Object. 4. Any method of the Object class may be invoked on an array. 5. An array object contains a sequence of variables. 6. The variables are called the components or elements of the array. 7. If the component type is T, then the array itself has type T[]. 8. An array type variable holds a reference to the array object. 9. The component type may itself be an array type. 10. An array element is a component whose type is not an array type. 11. An element s type may be either primitive or reference. 12. The length of an array is its number of components. 13. An array s length is set when the array is created, and it cannot be changed. 14. An array s length can be accessed as a public final instance variable. 15. Array index values must be integers in the range 0... length 1. 16. An ArrayIndexOutOfBoundsException is thrown if Property 15 is violated. 17. Variables of type short, byte, or char can be used as indexes. 18. Arrays can be duplicated with the Object.clone() method. 19. Arrays can be tested for equality with the Arrays.equals() method. 20. Array objects implement Cloneable and java.io.Serializable. Property 3 follows from Property 1. Although array types are not classes, they behave this way as extensions of the Object class. Property 7 shows that array types are not the same as class types. They are, in fact, derived types: For every class type T there is a corresponding array type T[]. Also, for each of the eight primitive types, the corresponding array type exists.
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