Java科学计算器程序代码--688IT编程网

计算器布局显示：

功能举例：

①13+20=33

②-7*14=-98：先输入7，再单击-/+将其变成负数，然后挨次单击×号、14与＝

③7!=5040

④sin30°=0.5：先输入30，然后按下′″按钮转换成角度值，再按下sin即可显示结果

⑤sqrt(4)=2：利用鼠标点击4后再点击sqrt按键即可显示结果

⑥2*π=6.2832

……

源程序如下：javascript计算器代码

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;

DecimalFormat;

import javax.swing.BorderFactory;

import javax.swing.ButtonGroup;

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 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 ButtonGroup 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);//设置标题栏

df = new DecimalFormat();//保留四位小数

this.setLayout(new BorderLayout(10, 5));

panel1 = new 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);

menu2 = new JMenu(查看);

menu3 = new JMenu(匡助);

menu1.setFont(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);

editItem2 = new JMenuItem(粘贴);

editItem1.setFont(new Font(宋体,Font.PLAIN,12)); editItem2.setFont(new Font(宋体,Font.PLAIN,12));

/**

*查看栏

seeItem1 = new JRadioButtonMenuItem(科学型); seeItem2 = new JRadioButtonMenuItem(标准型); seeItem3 = new JCheckBoxMenuItem(数字分组);

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));

/**

*匡助栏

help1 = new JMenuItem(匡助主题);

help2 = new JMenuItem(关于计算器);

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);

menu3.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

tf.setHorizontalAlignment(JTextField.RIGHT);//文字右对齐tf.setText();

tf.ateLoweredBevelBorder());

init();//对计算器进行初始化

}

/**

*初始化操作

*添加按钮

private void init(){

addButton(panel1, , new Clear(), d);