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标题: 球从100米高度自由落下，每次落地后反跳回原高度的一半... [打印本页]
作者: rightyuan521    时间: 2015-5-1 19:54
标题: 球从100米高度自由落下，每次落地后反跳回原高度的一半...
  1. 先第一种，为了解题而解题。

  3. ==== Main.java ====
  4. public class Main {
  5. private double TotalHeight = 100;
  6. private double CurHeight = 50;

  8. public void drop(int times) {
  9. if ((times - 1) == 0) {
  10. return;
  11. }

  13. setTotalHeight(getTotalHeight() + 2 * getCurHeight());
  14. setCurHeight(getCurHeight() / 2);

  16. drop(times - 1);
  17. }

  19. public double getTotalHeight() {
  20. return TotalHeight;
  21. }

  23. public void setTotalHeight(double totalHeight) {
  24. TotalHeight = totalHeight;
  25. }

  27. public double getCurHeight() {
  28. return CurHeight;
  29. }

  31. public void setCurHeight(double curHeight) {
  32. CurHeight = curHeight;
  33. }

  35. public static void main(String[] args) {
  36. Main main = new Main();
  37. main.drop(2);
  38. System.out.println("Total height is " + main.getTotalHeight());
  39. System.out.println("Current height is " + main.getCurHeight());
  40. }
  41. }

  43. ==== 然后是第二种 =====

  45. ==== Main.java ====
  46. package main;

  48. import javax.swing.JFrame;

  50. import panel.BallPanel;
  51. import time.Delay;

  53. public class MainFrame extends JFrame {
  54. public MainFrame(String title) {
  55. super(title);
  56. }

  58. public static void main(String[] args) {
  59. Delay delay = new Delay();

  61. MainFrame frame = new MainFrame("Hello JFrame");
  62. BallPanel ballPanel = new BallPanel();
  63. frame.add(ballPanel);
  64. frame.setSize(500, 500);
  65. frame.setVisible(true);
  66. frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  68. delay.initDelay();

  70. ballPanel.setDelay(delay.getDelay());
  71. ballPanel.loopDrop(0);
  72. }
  73. }
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