java语言程序设计基础篇范文第十版本第十三章学习练习答案.docx

01 public class Exercise13_01 { public static void main(String[] args) { TriangleNew triangle = new TriangleNew(1, , 1); (yellow); (true); The area is + ()); The perimeter is ()); } } class TriangleNew extends GeometricObject { private double side1 = , side2 = , side3 = ; /** Constructor */ public TriangleNew() { } /** Constructor */ public TriangleNew(double side1, double side2, double side3) { side1; side2; side3; } /** Implement the abstract method findArea in GeometricObject */ public double getArea() { double s = (side1 + side2 + side3) / 2; return (s * (s - side1) * (s - side2) * (s - side3)); } /** Implement the abstract method findCircumference in GeometricObject **/ public double getPerimeter() { return side1 + side2 + side3; } @Override public String toString() { ] Number currentMin = (i); int currentMinIndex = i; for (int j = i + 1; j (); j++) { if () (j).doubleValue()) { currentMin = (j); currentMinIndex = j; } } ; public class Exercise13_04 { static MyCalendar calendar = new MyCalendar(); public static void main(String[] args) { int month = + 1; int year = ; if 2) Usage java Exercise13_04 month year); else if == 2) { etRadius()) return 1; else if (getRadius() ((Circle1) o).getRadius()) return -1; else return 0; } } 06 public class Exercise13_06 { etArea()); if (objects[i] instanceof Colorable) ((Colorable)objects[i]).howToColor(); } } } interface Colorable { void howToColor(); } class Square extends GeometricObject implements Colorable { private double side; public Square(double side) { = side; } @Override public void howToColor() { Color all four sides); } @Override public double getArea() { return side * side; } @Override public double getPerimeter() { return 4 * side; } } 08 import class Exercise13_08 { public static void main(String[] args) { MyStack1 stack = new MyStack1(); (S1); (S2); (S); MyStack1 stack2 = (MyStack1) ()); (S1); (S2); (S); } } class MyStack1 implements Cloneable { private ArrayListObject list = new ArrayListObject(); public