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OBJECT-ORIENTED PROGRAMMING
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[CHAP. 1
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invokes the class method nextDouble() that is defined in the Random class and is bound to the object random which is an instance of that class. 1.15 Two objects should be equal if they have the same data values (i.e., the same state). Two references are equal if they refer to the same object. The condition (p == q) tests equality of the references p and q, not the equality of the objects to which they refer. The output from the code
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In the first case, the reference s is initialized by default to be null; there is no String object. In the second case, s is initialized to refer to the empty String object. 1.17 1.18 1.19 The advantage of forcing the public to use a mutator method to change a field is that you can control how the field is changed. An enum type is a type, defined with the enum keyword that lists by name each possible value for the type. When a type is composed of another type, the complete existence of that component type s objects is controlled by the composing type s object; the components are uniquely bound to it and cannout be changed by any outside object. With aggregation, the component elements exits outside of the collection, can be changed by other classes, and may even be components of other aggregates. Polymorphism describes the way an object or variable may be treated in different contexts as though it has a different type. For example, inheritance allows an argument of type B to be passed to a parameter of type A if B extends A.
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public interface Point { public double amplitude(); public double distanceTo(Point point); public boolean equals(Object object); public double magnitude(); public String toString(); public double xCoordinate(); public double yCoordinate(); } public interface Line { public boolean contains(Point point); public boolean equals(Object object); public boolean isHorizontal(); public boolean isVertical(); public double slope(); public String toString(); public double xIntercept(); public double yIntercept(); }
CHAP. 1]
OBJECT-ORIENTED PROGRAMMING
public interface Circle { public double area(); public Point center(); public double circumference(); public boolean contains(Point point); public boolean equals(Object object); public double radius(); public String toString(); } public interface Polynomial { public int degree(); public Polynomial derivative(); public boolean equals(Object object); public Polynomial sum(Polynomial polynomial); public String toString(); public double valueAt(double x); } public class MyPoint implements Point { private double x, y; public static Point ORIGIN = new MyPoint(); private MyPoint() { } public MyPoint(double x, double y) { this.x = x; this.y = y; } public double amplitude() { return Math.atan(y/x); } public double distanceTo(Point point) { if (point.equals(this)) { return 0.0; } else if (!(point instanceof MyPoint)) { throw new IllegalArgumentException("use a MyPoint object"); } else { MyPoint that = (MyPoint)point; double dx = that.x - this.x; double dy = that.y - this.y; return Math.sqrt(dx*dx + dy*dy); } } public boolean equals(Object object) { if (object==this) { return true; } else if (!(object instanceof MyPoint)) { return false; } MyPoint that = (MyPoint)object; return (that.x == this.x && that.y == this.y); } public double magnitude() { return Math.sqrt(x*x + y*y); }
OBJECT-ORIENTED PROGRAMMING
[CHAP. 1
public String toString() { return String.format("(%.2f,%.2f)", x, y); } public double xCoordinate() { return x; } public double yCoordinate() { return y; } }
public class MyLine implements Line { private double m, b; // slope, intercept public static Line X_AXIS = new MyLine(); private MyLine() { } public MyLine (double m, double b) { this.m = m; this.b = b; } public boolean contains(Point point) { double x = point.xCoordinate(); double y = point.yCoordinate(); return y == m*x + b; } public boolean equals(Object object) { if (object==this) { return true; } else if (!(object instanceof MyLine)) { return false; } MyLine that = (MyLine)object; return (that.m == this.m && that.b == this.b); } public boolean isHorizontal() { return m == 0.0; } public boolean isVertical() { return m == Double.POSITIVE_INFINITY || m==Double.NEGATIVE_INFINITY; } public double slope() { return m; } public String toString() { return String.format("y = %.2fx + %.2f", m, b); }
CHAP. 1]
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