JAVA简易计算器-lzy.docx

JAVA简易计算器系统流程Main（） disp()actionPerformed(ActionEvent e)setSum()windowClosing(WindowEvent e)该计算器基本运算没有问题，清零、正负号、求倒数、退格功能都能很好的实现，总体能完成一个计算器的基本功能，但仍有许多地方需要改进，比如小数点的实现所存在的一些问题，虽然在基本的运算过程当中不会造成太大影响，但这依然不能认为是一个很好的计算器，同时，在另一方面，该计算器还没能很好的实现连续计算的功能，必须每次按下等号按钮计算出结果后才能用产生的结果接着进行下一次的计算，改进的方法是在运算符上同时注册Result类，让运算符同时拥有计算结果的功能.实现代码import java.awt.Color;import java.awt.FlowLayout;import java.awt.GridLayout;import java.awt.Label;import java.awt.Panel;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.JButton;import javax.swing.JDialog;import javax.swing.JFrame;import javax.swing.JTextField;import javax.swing.SwingConstants;public class Calculator extends WindowAdapter implements ActionListener JFrame frame;JTextField show;JButton bc, c, ce, ab, jia, jian, cheng, chu, equ, point, sqrt, ds, bfh,zf;/ 按钮 退格，清空，复位，关于，加，减，乘，除，等号，小数点，2次方根，倒数，百分号，正负号JButton b = new JButton10; / 按钮数组，数字键09double sum = 0, getValue;int i = 0, j = 0, p = 0, l, action;JDialog about;final int slength = 30; / 设置结果显示有效长度public void disp() frame = new JFrame();frame.setTitle(bbb的个人计算器);frame.setSize(360, 230);frame.setLocation(380, 260);frame.setBackground(Color.LIGHT_GRAY);frame.setLayout(new FlowLayout(FlowLayout.CENTER);frame.setResizable(false);/计算器disTop模块，包括数字显示文本框、back，ce，c，about按钮show = new JTextField(31);show.setText(0);show.setHorizontalAlignment(SwingConstants.RIGHT);show.setEditable(false);frame.add(show);Panel dispTop = new Panel();frame.add(dispTop);dispTop.setLayout(new GridLayout(1, 4, 3, 3);bc = new JButton( Back );bc.setForeground(Color.BLUE);dispTop.add(bc);ce = new JButton( CE );ce.setForeground(Color.BLUE);dispTop.add(ce);c = new JButton( C );c.setForeground(Color.BLUE);dispTop.add(c);/广告按钮，显示计算器制作者ab = new JButton( About );ab.setForeground(Color.BLUE);dispTop.add(ab);about = new JDialog(frame, 关于计算器, true);Label ct = new Label(本 计 算 器 由 bbb 制 作, 1);ct.setForeground(Color.RED);about.add(ct, Center);about.setSize(200, 100);about.setLocation(500, 300);/主要按钮显示面板包括disLeft和disRightPanel dispMain = new Panel();frame.add(dispMain);dispMain.setLayout(new GridLayout(1, 2, 10, 10);/disLeft面板，包括0-9、+/-、。这十二个按钮Panel dispLeft = new Panel();dispMain.add(dispLeft);dispLeft.setLayout(new GridLayout(4, 3, 3, 3);Panel dispRight = new Panel();/disRight面板，包括+、-、*、/、sqrt、%、1/x、=这个人几个按钮 dispMain.add(dispRight);dispRight.setLayout(new GridLayout(4, 2, 3, 3);/新建0-9这是个按钮，并将其添加到disLeft中for (l = 9; l = 0; l-) bl = new JButton(String.valueOf(l);dispLeft.add(bl);bl.addActionListener(this);/新建其余按钮，并分别将其添加到各自的面板中jia = new JButton(+);jia.setForeground(Color.RED);jian = new JButton(-);jian.setForeground(Color.RED);cheng = new JButton(*);cheng.setForeground(Color.RED);chu = new JButton(/);chu.setForeground(Color.RED);equ = new JButton(=);equ.setForeground(Color.RED);point = new JButton(.);zf = new JButton( +/- );sqrt = new JButton(sqrt);bfh = new JButton(%);ds = new JButton(1/x);dispRight.add(chu);dispRight.add(sqrt);dispRight.add(cheng);dispRight.add(bfh);dispRight.add(jian);dispRight.add(ds);dispRight.add(jia);dispRight.add(equ);dispLeft.add(zf);dispLeft.add(point);/为各个按钮绑定 监听器about.addWindowListener(this);bc.addActionListener(this);ce.addActionListener(this);c.addActionListener(this);ab.addActionListener(this);jia.addActionListener(this);jian.addActionListener(this);cheng.addActionListener(this);chu.addActionListener(this);equ.addActionListener(this);point.addActionListener(this);zf.addActionListener(this);sqrt.addActionListener(this);bfh.addActionListener(this);ds.addActionListener(this);frame.addWindowListener(this);frame.setVisible(true);public void actionPerformed(ActionEvent e) getValue = Double.valueOf(show.getText().doubleValue();if (e.getSource() = jia) / 加运算，可连加if (j = 0) sum = getValue; else if (action = 1) sum += getValue;setSum();j+;p = 0;i = 0;action = 1; else if (e.getSource() = jian) / 减运算，可连减if (j = 0) sum = getValue; else if (action = 2) sum -= getValue;setSum();j+;p = 0;i = 0;action = 2; else if (e.getSource() = cheng) / 乘运算，可连乘if (j = 0) sum = getValue; else if (action = 3) sum *= getValue;setSum();j+;p = 0;i = 0;action = 3; else if (e.getSource() = chu) / 除运算，可连除if (j = 0)sum = getValue;else if (action = 4) sum /= getValue;setSum();j+;p = 0;i = 0;action = 4; else if (e.getSource() = equ) / 等号,运算最后一个操作数switch (action) case 1:show.setText(String.valueOf(sum += getValue);break;case 2:show.setText(String.valueOf(sum -= getValue);break;case 3:show.setText(String.valueOf(sum *= getValue);break;case 4:show.setText(String.valueOf(sum /= getValue);break;setSum();i = 0;j = 0;action = 0; else if (e.getSource() = point) / 小数点,只能按一个小数点if (p = 0)show.setText(show.getText() + e.getActionCommand();p = 1; else if (e.getSource() = c | e.getSource() = ce) / 清空与复位i = 0;j = 0;p = 0;sum = 0;action = 0;show.setText(0); else if (e.getSource() = bc) / 退格String s = show.getText();if (s.length() 1) show.setText();for (l = 0; l s.length() - 1; l+) / 按一下,删除尾部一位char a = s.charAt(l);show.setText(show.getText() + a); elseshow.setText(0); else if (e.getSource() = ab) / 关于about.setVisible(true); else if (e.getSource() = sqrt) / 开2次方根sum = Math.sqrt(getValue);setSum();i = 0; else if (e.getSource() = ds) / 求倒数sum = 1 / getValue;setSum();i = 0; else if (e.getSource() = bfh) / 百分号sum = getValue / 100;setSum();i = 0; else if (e.getSource() = zf) / 正负号切换,正号不显示String s = show.getText();char a = s.charAt(0);if (a = -) show.setText();for (l = 1; l s.length(); l+) / 去掉负号show.setText(show.getText() + s.charAt(l); else if (getValue != 0) / 加上负号show.setText(- + s);for (l = 0; l 10; l+) / 09数字键触发if (e.getSource() = bl) if (i = 0)show.setText();String s = show.getText();if (s.length() slength)show.setText(show.getText() + e.getActionCommand();if (e.getSource() = b0