中国大学MOOC 翁恺 java 兔子与狐狸代码

package foxnrabbit; import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.ArrayList; import javax.swing.JButton; import javax.swing.JFrame; /*swing 所有的东西都叫部件，其中一些东西是容器。button can be placed in frame*/ import animal.Animal; import animal.Fox; import animal.Rabbit; import cell.Cell; import field.Field; import field.Location; import field.View; public class FoxAndRabbitRe { private Field theField; private View theView; private JFrame frame = new JFrame(); //内部类——可以直接使用其他变量和函数 总感觉用于紧密耦合型的部分 private class stepListener implements ActionListener { @Override public void actionPerformed(ActionEvent e) { System.out.println("Nep!"); step(); frame.repaint(); } } public FoxAndRabbitRe(int size) { theField = new Field(size, size); for (int row = 0; row < theField.getHeight(); row++) { for (int col = 0; col < theField.getWidth(); col++) { double probability = Math.random(); if (probability < 0.05) { theField.place(row, col, new Fox()); } else if (probability < 0.15) { theField.place(row, col, new Rabbit()); } } } theView = new View(theField); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setResizable(false); frame.setTitle("Cells"); frame.add(theView, BorderLayout.CENTER); JButton btnstep =new JButton("单步"); frame.add(btnstep, BorderLayout.SOUTH); btnstep.addActionListener(new stepListener()); // btnstep.addActionListener(new ActionListener() { // /*这里的大括号意思是定义一个新的类（这里的是匿名类），这个类实现了ActionListener这个接口*/ // @Override // public void actionPerformed(ActionEvent e) { // System.out.println("Nep!"); // step(); // frame.repaint(); // } // }); frame.pack(); frame.setVisible(true); } public void start(int steps) { for (int i = 0; i < steps; i++) { step(); theView.repaint(); try { Thread.sleep(200); } catch (InterruptedException e) { e.printStackTrace(); } } } public void step() { for (int row = 0; row < theField.getHeight(); row++) { for (int col = 0; col < theField.getWidth(); col++) { Cell cell = theField.get(row, col); if (cell != null) { Animal animal = (Animal) cell; animal.grow(); if (animal.isAlive()) { // move Location loc = animal.move(theField.getFreeNeighbour(row, col)); if (loc != null) { theField.move(row, col, loc); } // eat // animal.eat(theField); Cell[] neighbour = theField.getNeighbour(row, col); ArrayList<Animal> listRabbit = new ArrayList<Animal>(); for (Cell an : neighbour) { if (an instanceof Rabbit) { listRabbit.add((Rabbit) an); } } if (!listRabbit.isEmpty()) { Animal fed = animal.feed(listRabbit); if (fed != null) { theField.remove((Cell) fed); } } // breed Animal baby = animal.breed(); if (baby != null) { theField.placeRandomAdj(row, col, (Cell) baby); } } else { theField.remove(row, col); } } } } } public static void main(String[] args) { FoxAndRabbitRe fab = new FoxAndRabbitRe(50); // fab.start(200); } }