科学计算器程序Java代码

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1、功能举例：源程序如下：import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import java.awt.Font;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.text.DecimalFormat;import javax.swing.BorderFactory;import javax.swing.ButtonGrou

2、p;import javax.swing.JButton;import javax.swing.JCheckBoxMenuItem;import javax.swing.JFrame;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JPanel;import javax.swing.JRadioButtonMenuItem;import javax.swing.JTextField;public class Calucator extends

3、 JFrame private JTextField tf;private JPanel panel1, panel2, panel3, panel4;private JMenuBar myBar;private JMenu menu1, menu2, menu3;private JMenuItem editItem1, editItem2, help1, help2, help3;private JRadioButtonMenuItem seeItem1, seeItem2;/单选框private JCheckBoxMenuItem seeItem3;/复选框private ButtonGr

4、oup bgb;private String back;private boolean IfResult = true, flag = false;private String oper = =;private double result = 0;private Num numActionListener;private DecimalFormat df;public Calucator()super(科学计算器);/设立标题栏df = new DecimalFormat(#.#);/保存四位小数this.setLayout(new BorderLayout(10, 5);panel1 = n

5、ew JPanel(new GridLayout(1, 3, 10, 10);panel2 = new JPanel(new GridLayout(5, 6, 5, 5);/5行6列panel3 = new JPanel(new GridLayout(5, 1, 5, 5);panel4 = new JPanel(new BorderLayout(5, 5);/* * 菜单栏 */myBar = new JMenuBar();menu1 = new JMenu(编辑(E);menu2 = new JMenu(查看(V);menu3 = new JMenu(协助(H);menu1.setFont

6、(new Font(宋体, Font.PLAIN, 12);menu2.setFont(new Font(宋体, Font.PLAIN, 12);menu3.setFont(new Font(宋体, Font.PLAIN, 12);/* * 编辑栏 */editItem1 = new JMenuItem(复制(C) Ctrl+C);editItem2 = new JMenuItem(粘贴(P) Ctrl+V);editItem1.setFont(new Font(宋体,Font.PLAIN,12);editItem2.setFont(new Font(宋体,Font.PLAIN,12);/*

7、* 查看栏 */seeItem1 = new JRadioButtonMenuItem(科学型(T);seeItem2 = new JRadioButtonMenuItem(原则型(S);seeItem3 = new JCheckBoxMenuItem(数字分组(I);seeItem1.setFont(new Font(宋体,Font.PLAIN,12);seeItem2.setFont(new Font(宋体,Font.PLAIN,12);seeItem3.setFont(new Font(宋体,Font.PLAIN,12);/* * 协助栏 */help1 = new JMenuItem(

8、协助主题(H);help2 = new JMenuItem(有关计算器(A);help1.setFont(new Font(宋体,Font.PLAIN,12);help2.setFont(new Font(宋体,Font.PLAIN,12);bgb = new ButtonGroup();/选项组menu1.add(editItem1);menu1.add(editItem2);menu2.add(seeItem1);menu2.add(seeItem2);menu2.addSeparator();/添加一条分割线menu2.add(seeItem3);menu3.add(help1);men

9、u3.addSeparator();/添加一条分割线menu3.add(help2);myBar.add(menu1);myBar.add(menu2);myBar.add(menu3);this.setJMenuBar(myBar);numActionListener = new Num();/实现数字监听/* * 文本域，即为计算器的屏幕显示区域 */tf = new JTextField();tf.setEditable(false);/文本区域不可编辑tf.setBackground(Color.white);/文本区域的背景色tf.setHorizontalAlignment(JTe

10、xtField.RIGHT);/文字右对齐tf.setText(0);tf.setBorder(BorderFactory.createLoweredBevelBorder();init();/对计算器进行初始化/* * 初始化操作 * 添加按钮 */private void init()addButton(panel1, Backspace, new Clear(), Color.red);addButton(panel1, CE, new Clear(), Color.red);addButton(panel1, C, new Clear(), Color.red);addButton(p

11、anel2, 1/x, new Signs(), Color.magenta);addButton(panel2, log, new Signs(), Color.magenta);addButton(panel2, 7, numActionListener, Color.blue);addButton(panel2, 8, numActionListener, Color.blue);addButton(panel2, 9, numActionListener, Color.blue);addButton(panel2, , new Signs(), Color.red);addButton

12、(panel2, n!, new Signs(), Color.magenta);addButton(panel2, sqrt, new Signs(), Color.magenta);addButton(panel2, 4, numActionListener, Color.blue);addButton(panel2, 5, numActionListener, Color.blue);addButton(panel2, 6, numActionListener, Color.blue);addButton(panel2, , new Signs(), Color.red);addButt

13、on(panel2, sin, new Signs(), Color.magenta);addButton(panel2, x2, new Signs(), Color.magenta);addButton(panel2, 1, numActionListener, Color.blue);addButton(panel2, 2, numActionListener, Color.blue);addButton(panel2, 3, numActionListener, Color.blue);addButton(panel2, -, new Signs(), Color.red);addBu

14、tton(panel2, cos, new Signs(), Color.magenta);addButton(panel2, x3, new Signs(), Color.magenta);addButton(panel2, 0, numActionListener, Color.blue);addButton(panel2, -/+, new Clear(), Color.blue);addButton(panel2, ., new Dot(), Color.blue);addButton(panel2, +, new Signs(), Color.red);addButton(panel

15、2, tan, new Signs(), Color.magenta);addButton(panel2, %, new Signs(), Color.magenta);addButton(panel2, , numActionListener, Color.orange);addButton(panel2, e, numActionListener, Color.orange);addButton(panel2, , new Signs(), Color.orange);addButton(panel2, =, new Signs(), Color.red);JButton btns = n

16、ew JButton(计算器);btns.setBorder(BorderFactory.createLoweredBevelBorder();btns.setEnabled(false);/按钮不可操作btns.setPreferredSize(new Dimension(20, 20);panel3.add(btns);/加入按钮addButton(panel3, MC, null, Color.red);addButton(panel3, MR, null, Color.red);addButton(panel3, MS, null, Color.red);addButton(panel

17、3, M+, null, Color.red);panel4.add(panel1, BorderLayout.NORTH);panel4.add(panel2, BorderLayout.CENTER);this.add(tf, BorderLayout.NORTH);this.add(panel3, BorderLayout.WEST);this.add(panel4);pack();this.setResizable(false);/窗口不可变化大小this.setLocation(300, 200);this.setDefaultCloseOperation(JFrame.EXIT_O

18、N_CLOSE);/* * 统一设立按钮的的使用方式 * param panel * param name * param action * param color */private void addButton(JPanel panel, String name, ActionListener action, Color color)JButton bt = new JButton(name);panel.add(bt);/在面板上增长按钮bt.setForeground(color);/设立前景（字体）颜色bt.addActionListener(action);/增长监听事件/* *

19、计算器的基本操作（+ - ） * param x */private void getResult (double x)if(oper = +)result += x;else if(oper = -)result -= x;else if(oper = )result *= x;else if(oper = )result /= x;else if(oper = =)result = x;tf.setText(df.format(result);/* * 运算符号的事件监听 */class Signs implements ActionListenerpublic void actionPe

20、rformed(ActionEvent e) /* * 用ActionEvent对象的getActionCommand()措施 * 获得与引起事件对象有关的字符串 */String str = e.getActionCommand();/* sqrt求平方根 */if(str.equals(sqrt)double i = Double.parseDouble(tf.getText();if(i=0)/* * String.valueOf() 转换为字符串 * df.format() 按规定保存四位小数 * Math.sqrt() 求算数平方根 */tf.setText(String.value

21、Of(df.format(Math.sqrt(i);elsetf.setText(负数不能开平方根);/* log求常用对数 */else if(str.equals(log)double i = Double.parseDouble(tf.getText();if(i0)tf.setText(String.valueOf(df.format(Math.log(i);elsetf.setText(负数不能求对数);/* %求比例 */else if(str.equals(%)tf.setText(df.format(Double.parseDouble(tf.getText() / 100);

22、/* 1/x求倒数 */else if(str.equals(1/x)if(Double.parseDouble(tf.getText() = 0)tf.setText(除数不能为零);elsetf.setText(df.format(1 / Double.parseDouble(tf.getText();/* sin求正弦函数 */else if(str.equals(sin)double i = Double.parseDouble(tf.getText();tf.setText(String.valueOf(df.format(Math.sin(i);/* cos求余弦函数 */else

23、 if(str.equals(cos)double i = Double.parseDouble(tf.getText();tf.setText(String.valueOf(df.format(Math.cos(i);/* tan求正切函数 */else if(str.equals(tan)double i = Double.parseDouble(tf.getText();tf.setText(String.valueOf(df.format(Math.tan(i);/* n!求阶乘 */else if(str.equals(n!)double i = Double.parseDouble

24、(tf.getText();if(i%2=0)|(i%2=1)/判断为整数放进行阶乘操作int j = (int)i;/强制类型转换int result=1;for(int k=1;k 0)if(tf.getText().length() 1)tf.setText(tf.getText().substring(0, tf.getText().length() - 1);/使用退格删除最后一位字符elsetf.setText(0);IfResult = true;elseif(tf.getText().length() 2)tf.setText(tf.getText().substring(0,

25、 tf.getText().length() - 1);elsetf.setText(0);IfResult = true;else if(str = CE)tf.setText(0);IfResult = true;/* * 数字输入的事件监听 */class Num implements ActionListenerpublic void actionPerformed(ActionEvent e) String str = e.getActionCommand();if(IfResult)tf.setText();IfResult = false;if(str=)tf.setText(S

26、tring.valueOf(Math.PI);else if(str=e)tf.setText(String.valueOf(Math.E);elsetf.setText(tf.getText().trim() + str);if(tf.getText().equals(0)tf.setText(0);IfResult = true;flag = true;/* * 小数点的事件监听 */class Dot implements ActionListenerpublic void actionPerformed(ActionEvent e) IfResult = false;if(tf.getText().trim().indexOf(.) = -1)tf.setText(tf.getText() + .);/* * main措施 */public static void main(String args) new Calucator().setVisible(true);