基于JAVA语言的计算器图形界面设计.doc

题目：简易计算器的设计一、设计概要1、设计内容计算器的设计使用图形用户界面实现，能够进行简单的加、减、乘、除四则计算；参与运算的数字通过点击按钮输入。2、程序流程图开始创建界面框架创建文本框方法创建面板方法创建按钮方法添加按钮到面板创建数字按钮对象创建运算符号按钮对象运算与判断?NY结束 2、 详细设计import java.awt.BorderLayout; /导入AWT页面设置类import java.awt.Button; /导入AWT按钮类import java.awt.Frame;import java.awt.GridLayout;import java.awt.Panel; import java.awt.TextField;import java.awt.event.MouseEvent;import java.awt.event.MouseListener; /导入AWT鼠标监视器import java.awt.event.WindowEvent;import java.awt.event.WindowListener;/导入AWT窗口监视器/创建计算器的主窗口，该类含有main函数public class Calculator public static void main(String args) /创建Frame对象Frame f = new Frame(Calculator);/创建文本框，用于接收数字和操作final TextField tf = new TextField();/声明一个面板用于存放按钮Panel p = new Panel();f.setLayout(new BorderLayout();/将文本框放在北部f.add(tf, BorderLayout.NORTH);/将按钮放于中部f.add(p, BorderLayout.CENTER);/设置布局模式p.setLayout(new GridLayout(4, 4);/创建16个按钮Button one = new Button(1);Button two = new Button(2);Button three = new Button(3);Button four = new Button(4);Button five = new Button(5);Button six = new Button(6);Button seven = new Button(7);Button eight = new Button(8);Button nine = new Button(9);Button zero = new Button(0);Button add = new Button(+);Button sub = new Button(-);Button mul = new Button(*);Button div = new Button(/);Button decimal = new Button(.);final Button equal = new Button(=);/将按钮添加到Pp.add(one);p.add(two);p.add(three);p.add(four);p.add(five);p.add(six);p.add(seven);p.add(eight);p.add(nine);p.add(zero);p.add(add);p.add(sub);p.add(mul);p.add(div);p.add(decimal);p.add(equal);final String ary = , null, ;/该类为主类创建数字按钮对象class NumMouseListener implements MouseListenerpublic void mouseClicked(MouseEvent e) String num = (Button)e.getSource().getLabel().trim();if(ary1 = null) ary0 = ary0 + + num; else ary2 = ary2 + + num; tf.setText(tf.getText() + + num);public void mouseEntered(MouseEvent e)public void mouseExited(MouseEvent e)public void mousePressed(MouseEvent e)public void mouseReleased(MouseEvent e)/为每个按钮添加事件one.addMouseListener(new NumMouseListener();two.addMouseListener(new NumMouseListener();three.addMouseListener(new NumMouseListener();four.addMouseListener(new NumMouseListener();five.addMouseListener(new NumMouseListener();six.addMouseListener(new NumMouseListener();seven.addMouseListener(new NumMouseListener();eight.addMouseListener(new NumMouseListener();nine.addMouseListener(new NumMouseListener();zero.addMouseListener(new NumMouseListener();/该类为主类创建运算符号按钮对象class Operatotr MouseListener implements MouseListenerpublic void mouseClicked(MouseEvent e) if(e.getSource() = equal)try long result = calculate(Integer.parseInt(ary0), Integer.parseInt(ary2), ary1);tf.setText(String.valueOf(result);ary0 = tf.getText();ary1 = null;ary2 = ;catch (Exception e1) e1.printStackTrace(); else ary1 = (Button) e.getSource().getLabel();if(ary0.length() 0) ary2 = ; elseary0 = String.valueOf(tf.getText(); tf.setText(); private long calculate(int i, int j, String operator) throws Exception if(operator.equals(+)return i + j; else if(operator.equals(-)return i - j; else if(operator.equals(*)return i * j;else if(operator.equals(/)return i / j;elsethrow new Exception(Invalid operator.(Only +-/* accepted); public void mouseEntered(MouseEvent e)public void mouseExited(MouseEvent e)public void mousePressed(MouseEvent e)public void mouseReleased(MouseEvent e)add.addMouseListener(new OperatotrMouseListener();mul.addMouseListener(new OperatotrMouseListener();div.addMouseListener(new OperatotrMouseListener();sub.addMouseListener(new OperatotrMouseListener();equal.addMouseListener(new OperatotrMouseListener();f.addWindowListener(new WindowListener()public void windowClosing(WindowEvent e) System.exit(0); public void windowActivated(WindowEvent e)public void windowClosed(WindowEvent e)public void windowDeactivated(WindowEvent e)public void windowDeiconified(WindowEvent e)public void windowIconified(WindowEvent e)public void windowOpened(WindowEvent e);f.setVisible(true); /使界面可现f.setBounds(200, 200, 250, 250); /设置界面的位置三、运行调试与分析讨论1、乘法计算，运算结果如图2、除法计算，运算结果如图结果分析：由计算结果可以看出，计算器可以完成简单的加、减、乘、除运算，但计算器不具有清零的效果