java 计算列的实现_java中，用布局器实现计算器界面并实现加减乘除等功能，怎样编程...

缺乏、安全感 2022-11-03 11:58 69阅读 0赞

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java写的，可行

package ex1;

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.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 Calcutor 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 Calcutor()\{

super("科学计算器");//设置标题栏32313133353236313431303231363533e58685e5aeb931333363373161

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(E)");

menu2 = new JMenu("查看(V)");

menu3 = new JMenu("帮助(H)");

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(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));

/\*\*

\* 查看栏

\*/

seeItem1 = new JRadioButtonMenuItem("科学型(T)");

seeItem2 = new JRadioButtonMenuItem("标准型(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));

/\*\*

\* 帮助栏

\*/

help1 = new JMenuItem("帮助主题(H)");

help2 = new JMenuItem("关于计算器(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);

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);//文本区域的背景色

tf.setHorizontalAlignment(JTextField.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(panel2, "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(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);

addButton(panel2, "sin", new Signs(), Color.magenta);

addButton(panel2, "x^2", 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);

addButton(panel2, "cos", new Signs(), Color.magenta);

addButton(panel2, "x^3", 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(panel2, "tan", new Signs(), Color.magenta);

addButton(panel2, "%", new Signs(), Color.magenta);

addButton(panel2, "π", numActionListener, Color.orange);

addButton(panel2, "e", numActionListener, Color.orange);

addButton(panel2, "′″", new Signs(), Color.orange);

addButton(panel2, "=", new Signs(), Color.red);

JButton btns = new 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(panel3, "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);//窗口不可改变大小

this.setLocation(300, 200);

this.setDefaultCloseOperation(JFrame.EXIT\_ON\_CLOSE);

/\*\*

\* 统一设置按钮的的使用方式

\* @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);//在面板上增加按钮

bt.setForeground(color);//设置前景(字体)颜色

bt.addActionListener(action);//增加监听事件

/\*\*

\* 计算器的基础操作(+ - × ÷)

\* @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 ActionListener\{

public void actionPerformed(ActionEvent e) \{

/\*

\* 用ActionEvent对象的getActionCommand()方法

\* 取得与引发事件对象相关的字符串

\*/

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() 按要求保留四位小数

\* Math.sqrt() 求算数平方根

\*/

tf.setText(String.valueOf(df.format(Math.sqrt(i))));

else\{

tf.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(i>0)\{

tf.setText(String.valueOf(df.format(Math.log(i))));

\}else\{

tf.setText("负数不能求对数");

/\* %求百分比 \*/

else if(str.equals("%"))\{

tf.setText(df.format(Double.parseDouble(tf.getText()) / 100));

/\* 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");

\}else\{

tf.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 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(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<=j;k++)

result \*= k;

tf.setText(String.valueOf(result));

else

tf.setText("无法进行阶乘");

/\* x^2求平方 \*/

else if(str.equals("x^2"))\{

double i = Double.parseDouble(tf.getText());

tf.setText(String.valueOf(df.format(i\*i)));

/\* x^3求立方 \*/

else if(str.equals("x^3"))\{

double i = Double.parseDouble(tf.getText());

tf.setText(String.valueOf(df.format(i\*i\*i)));

/\* ′″角度转换 \*/

/\*\*

\* 将角度值转换成弧度值，方便三角函数的计算

\*/

else if(str.equals("′″"))\{

double i = Double.parseDouble(tf.getText());

tf.setText(String.valueOf(i/180\*Math.PI));

else\{

if(flag)\{

IfResult = false;

if(IfResult)\{

oper = str;

\}else\{

getResult(Double.parseDouble(tf.getText()));

oper = str;

IfResult = true;

/\*\*

\* 清除按钮的事件监听

\*/

class Clear implements ActionListener\{

public void actionPerformed(ActionEvent e) \{

/\*

\* 用ActionEvent对象的getActionCommand()方法

\* 取得与引发事件对象相关的字符串

\*/

String str = e.getActionCommand();

if(str == "C")\{

tf.setText("0");

IfResult = true;

result = 0;

\}else if(str == "-/+")\{

double i = 0 - Double.parseDouble(tf.getText().trim());

tf.setText(df.format(i));

\}else if(str == "Backspace")\{

if(Double.parseDouble(tf.getText()) > 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

\}else\{

tf.setText("0");

IfResult = true;

\}else\{

if(tf.getText().length() > 2)\{

tf.setText(tf.getText().substring(0, tf.getText().length() - 1));

\}else\{

tf.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 ActionListener\{

public void actionPerformed(ActionEvent e) \{

String str = e.getActionCommand();

if(IfResult)\{

tf.setText("");

IfResult = false;

if(str=="π")

tf.setText(String.valueOf(Math.PI));

else if(str=="e")

tf.setText(String.valueOf(Math.E));

else\{

tf.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 ActionListener\{

public void actionPerformed(ActionEvent e) \{

IfResult = false;

if(tf.getText().trim().indexOf(".") == -1)\{

tf.setText(tf.getText() + ".");

/\*\*

\* main方法

\*/

public static void main(String\[\] args) \{

new Calcutor().setVisible(true);

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