java实验报告 2.doc

实 验 报 告课程：Java 编程技术 班级：网络1203班 学号： 姓名： 实验 4 面向对象编程 一、实验目的 通过编程和上机实验理解 Java 语言是如何体现面向对象编程基本思想，了解类的封装方法，以及 如何创建类和对象，了解成员变量和成员方法的特性，掌握 OOP 方式进行程序设计的方法，了解类的继承性和多态性的作用。二、实验内容1. 创建一个名为Dog的类，它具有重载的bark()方法。bark()方法应根据不同的基本数据类型的参数来进行重载，bark()方法可根据参数输出狗吠（barking）、咆哮（howling）等信息。编写main()方法来调用不同的bark()方法。源代码如下： public class Dog void f(int m)System.out.println(barking!);void f(double n)System.out.println(hoeling!);public static void main(String args)Dog d=new Dog();d.f(2);d.f(2.2);运行界面如下：2. 创建Rodent(啮齿动物)类，其子类有Mouse（老鼠）、Mole（鼹鼠）、Hamster（大颊鼠）。在父类中，提供对所有的Rodent通用的方法。在子类中，根据该子类特定的行为习性来覆盖这些方法。例如老鼠属杂食（omnivorous），鼹鼠主食昆虫（insect），大颊鼠主食植物种子（plant seed）。创建一个Rodent数组，填充不同的数据类型，然后调用父类的方法，观察会发生什么情况。源代码如下：public class Rodent void eat()System.out.println(zhushi);public static void main(String args)Rodent r=new Rodent4;Rodent rodent=new Rodent();Mouse mouse=new Mouse();Mole mole=new Mole();Hamster hamster=new Hamster();r0=rodent;r1=mouse;r2=mole;r3=hamster;r0.eat();r1.eat();r2.eat();r3.eat();class Mouse extends Rodentvoid eat()System.out.println(omniovrous!);class Mole extends Rodentvoid eat()System.out.println(insect!);class Hamster extends Rodentvoid eat()System.out.println(plant seed!);运行界面如下：3. 3.修改上述第9题中的Rodent类，使其成为一个抽象类。只要有可能，就将Rodent的方法声明为抽象方法。创建各种啮齿动物类，观察程序的输出。 源代码如下：public class Rodent1 public static void main(String args) Rodent r=new Rodent3; Mouse m=new Mouse(); Mole s=new Mole(); Hamster h=new Hamster(); r0=m; r1=s; r2=h; r0.eat(); r1.eat(); r2.eat();abstract class Rodentpublic abstract void eat();class Mouse extends Rodentpublic void eat()System.out.println(omnivorous!);class Mole extends Rodentpublic void eat()System.out.println(insects!);class Hamster extends Rodentpublic void eat()System.out.println(plant seeds!);运行界面如下：实验 6 图形用户界面 一、实验目的 了解图形用户界面基本组件窗口、按钮、文本框、选择框、滚动条等的使用方法，了解如何使用布局管理器对组件进行管理，以及如何使用 Java 的事件处理机制。 2、 实验内容1 编写程序界面，其中包括一个标签、一个文本框和一个按钮。当用户单击按钮时，程序把文本框中的内容复制到标签中。代码如下：import java.awt.*; import java.awt.event.*; public class CopyStringToLabel extends Frame implements ActionListener private Label label = new Label(); private TextField output = new TextField(); private Button copy = new Button(Copy); private class WindowCloser extends WindowAdapter public void windowClosing(WindowEvent we) System.exit(0); public CopyStringToLabel () super(Copy a String To Label); setup(); copy.addActionListener(this); addWindowListener(new WindowCloser(); public void actionPerformed(ActionEvent e) if(e.getSource() = copy) label.setText(output.getText(); private void setup() Panel textGrid = new Panel(); textGrid.setLayout(new GridLayout(2,1); textGrid.add(label); textGrid.add(output); setLayout(new BorderLayout(); add(Center,textGrid); add(South,copy); pack(); setVisible(true); public static void main(String args) CopyStringToLabel cop = new CopyStringToLabel(); 运行结果：2 编写一个组合处理鼠标事件和键盘事件的程序。该程序模拟一个电子白板，用户可用鼠标在白板上画画，并通过键盘在上面写字。代码如下：import java.applet.Applet; import java.awt.*; import java.awt.event.*; public class MouseAndKeyDemo extends Applet protected int lastX = 0, lastY = 0; public void init() addMouseListener(new PositionRecorder(); addMouseMotionListener(new LineDrawer(); addKeyListener(new CharDrawer(); setForeground(Color.black); setBackground(Color.white); protected void record(int x, int y) lastX = x; lastY = y; private class PositionRecorder extends MouseAdapter public void mouseEnter(MouseEvent e) requestFocus(); record(e.getX(),e.getY(); public void mousePressed(MouseEvent e) record(e.getX(),e.getY(); private class LineDrawer extends MouseMotionAdapter public void mouseDragged(MouseEvent e) int x = e.getX(); int y = e.getY(); Graphics g = getGraphics(); g.drawLine(lastX, lastY, x, y); record(x, y); private class CharDrawer extends KeyAdapter public void keyTyped(KeyEvent event) String s = String.valueOf(event.getKeyChar(); getGraphics().drawString(s, lastX, lastY); record(lastX + 11, lastY); 运行结果：3、 编写一个程序，能够用鼠标画直线、圆、矩形、弧线等。代码如下：import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;class PainterPanel extends JPanel implements MouseListener int shape = -1; Point point = new Point2; public PainterPanel () super (); this.setBackground(Color.white); point0 = new Point (-1, -1); point1 = new Point (-1, -1); addMouseListener (this); public void mouseReleased(MouseEvent e) point1=new Point(e.getX(),e.getY(); repaint(); public void mouseEntered (MouseEvent e) public void mouseExited (MouseEvent e) public void mouseClicked (MouseEvent e) public void mousePressed (MouseEvent e) point0 = new Point(e.getX(), e.getY(); public void paint(Graphics g) super.paint(g); switch (shape) case 0: g.drawLine (point0.x, point0.y, point1.x, point1.y); break; case 1: int width = point1.x - point0.x; int height= point1.y - point0.y; g.drawOval (point0.x, point0.y, width, width); break; case 2: width = point1.x - point0.x; height = point1.y - point0.y; g.drawRect(point0.x, point0.y, width, height); break; case 3: width = point1.x - point0.x; height = point1.y - point0.y; g.drawArc(point0.x,point0.y, width, height,0,95); break; public void drawShape(int shape) this.shape=shape; public class PainterDemo extends JFrame JButton button = new JButton4; PainterPanel painter = new PainterPanel(); public PainterDemo() super(Java画图小程序); String buttonName = 直线, 圆, 矩形,弧形; DrawShapeListener buttonListener = new DrawShapeListener(); JToolBar toolBar = new JToolBar(); ButtonGroup buttonGroup = new ButtonGroup(); for (int i = 0; i button.length; i +) buttoni = new JButton (buttonNamei); buttoni.addActionListener (buttonListener); buttonGroup.add(buttoni); toolBar.add(buttoni); Container container=getContentPane(); container.add (toolBar,BorderLayout.NORTH); container.add (painter,BorderLayout.CENTER); setSize(300,200); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); class DrawShapeListener implements ActionListener public void actionPerformed(ActionEvent e) for (int i = 0; i button.length; i +) if (e.getSource() = buttoni) painter.drawShape(i); public static void main(String args) new PainterDemo(); 运行结果： 实验 7 1、 实验目的：1、了解java循环控制。2、 实验内容：1、 用控制语句编写一个程序，求出1000以内的所有素数。然后再编写一个可以比较while语句和do-while语句的程序。代码如下：public class Prime public static void main(String args) int i,j,k=0,flag; for(i=2;i=1000;i+) flag = 1; for(j=2;ji;j+) if(i%j=0) flag=0; break; if(flag!=0) System.out.print(i+t); k+; if(k%15=0) System.out.print(n); 运行结果：比较while和do-while的代码：public class BiJiao public static void main(String args) int i = 1; int sum1=0;while(i=5)sum1+=i;i+; System.out.println(五以内的数和由while语句计算的结果);System.out.println(