Java-GUI简单实现计算器

java初学者，写了个简单的计算器，分享一下，写文章也是提升技术的开端，有部分代码百度拿过来用的，初学者请谅解，我会努力的，不喜勿喷，有不足，请指点。

注意：小程序上的logo仅供学习使用，请勿商用，若有任何问题与本人无关。

最后有源码和生成的exe文件。

效果图：

不废话上代码：

package CalculatorPackage;

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
public class Calculator{
	//初始化
	static JFrame jf = new JFrame("计算器");
	static JPanel jpTotal = new JPanel();	//存在总面板
	static JPanel jpText = new JPanel();	//存储文本框
	static JPanel jpButton = new JPanel();	//存储按钮
	static JTextField jt = new JTextField();
	static final String[] jbFunction = {"7", "8", "9", "÷", "4", "5", "6", "×", "1", "2", "3", "-", "ײ", "0", ".", "+", "☕", "CE", "C", "="};
	static JButton[] jb = new JButton[jbFunction.length]; 
	static double numberOne;
	static double numberTwo;
	static int count;

	//菜单栏
	static JMenuBar bar = new JMenuBar();
	static JMenu[] menus = {new JMenu("≡"), new JMenu("设置")};
	
	//子菜单
	static String[] wordColors = {"红色","黄色","蓝色","绿色","青色","紫色","黑色","白色","灰色"};
	static String[] colors = {"红色","黄色","蓝色","绿色","青色","紫色","黑色","白色","灰色"};
	static JRadioButtonMenuItem[] colorItems, panelColorItems;		//单选项菜单类
	static ButtonGroup group = new ButtonGroup();
	
	//用于删除字符串，存储新的字符串
	static String str = "";
	static String s = "";
	static String st;
	static int result;
	//整个面板
	public static void demo() {
		
		//设置窗体logo
		Toolkit tk = Toolkit.getDefaultToolkit();
		Image im = tk.getImage(jf.getClass().getResource("/img/logo.png"));
		jf.setIconImage(im);
		
		//窗体不能拖动大小
		jf.setResizable(false);
		
		//设置窗体大小位置
		jf.setBounds(500, 200, 400, 400);
		
		//面板设置
		jpTotal.setBorder(new EmptyBorder(5,5,4,4));	//设置总面板边框
		jpTotal.setLayout(new BorderLayout(0,0));
		jpTotal.add(jpText, BorderLayout.NORTH); //将面板放置在边界布局的北部
		jf.add(jpTotal);
	
		//添加文本框
		jt.setHorizontalAlignment(SwingConstants.RIGHT);
		jt.setFont(new Font("楷体", Font.BOLD, 25));
		jt.setColumns(27); 
		jpText.add(jt);
		
		//添加按钮
		jpButton.setLayout(new GridLayout(5,5,4,4));
		for(int i = 0; i < jb.length; i++) {
			jb[i] = new JButton(jbFunction[i]);
			jpButton.add(jb[i]);
			jb[i].addActionListener(new MyAction());
			jb[i].setBackground(Color.lightGray);
			jb[i].setContentAreaFilled(true);
			jb[i].setToolTipText("I'm " + jb[i].getText());
			jb[i].setFont(new Font(null, Font.BOLD,18));
		}
		jpTotal.add(jpButton, BorderLayout.CENTER);
		
		//添加菜单栏一级和二级菜单
		for(int i = 0; i < menus.length; i++) {
			bar.add(menus[i]);
		}
		JMenuItem item1 = new JMenuItem("关于");
		item1.addActionListener(new MyColors());
		menus[0].add(item1);
		
		JMenu item2 = new JMenu("字体颜色");
		menus[1].add(item2);
		
		JMenu item3 = new JMenu("按钮边框颜色");
		menus[1].add(item3);
		
		//添加三级菜单
		//字体颜色菜单
		colorItems = new JRadioButtonMenuItem[wordColors.length];
		for(int i = 0; i < wordColors.length; i++) {
			colorItems[i] = new JRadioButtonMenuItem(wordColors[i]);
			group.add(colorItems[i]);
			item2.add(colorItems[i]);
			colorItems[i].addActionListener(new MyColors());
		}
		//colorItems[8].setSelected(true);  //初始化默认值
		
		//面板颜色菜单
		panelColorItems = new JRadioButtonMenuItem[colors.length];
		for(int i = 0; i < colors.length; i++) {
			panelColorItems[i] = new JRadioButtonMenuItem(colors[i]);
			group.add(panelColorItems[i]);
			item3.add(panelColorItems[i]);
			panelColorItems[i].addActionListener(new MyPanelColors());
		}
		//panelColorItems[8].setSelected(true);		
		
		jf.setJMenuBar(bar);

		//窗体显示和关闭
		jf.setVisible(true);
		jf.setDefaultCloseOperation(jf.EXIT_ON_CLOSE);
	}
	
	//字体颜色
	static class MyColors implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			for(int i = 0; i < jb.length; i++) {
				if("红色".equals(e.getActionCommand())) {
					jb[i].setForeground(Color.red);
					jt.setForeground(Color.red);
				}else if("黄色".equals(e.getActionCommand())) {
					jb[i].setForeground(Color.yellow);
					jt.setForeground(Color.yellow);
				}else if("蓝色".equals(e.getActionCommand())) {
					jb[i].setForeground(Color.blue);
					jt.setForeground(Color.blue);
				}else if("绿色".equals(e.getActionCommand())) {
					jb[i].setForeground(Color.green);
					jt.setForeground(Color.green);
				}else if("青色".equals(e.getActionCommand())) {
					jb[i].setForeground(Color.cyan);
					jt.setForeground(Color.cyan);
				}else if("紫色".equals(e.getActionCommand())) {
					jb[i].setForeground(Color.MAGENTA);
					jt.setForeground(Color.MAGENTA);
				}else if("黑色".equals(e.getActionCommand())) {
					jb[i].setForeground(Color.black);
					jt.setForeground(Color.black);
				}else if("白色".equals(e.getActionCommand())) {
					jb[i].setForeground(Color.white);
					jt.setForeground(Color.white);
				}else if("灰色".equals(e.getActionCommand())) {
					jb[i].setForeground(Color.gray);
					jt.setForeground(Color.gray);
				}else if("关于".equals(e.getActionCommand())) {
					JOptionPane.showMessageDialog(null, "仅供学习使用!", "天道酬勤",JOptionPane.DEFAULT_OPTION); 
					break;		//跳出循环，实现跳出弹框关闭效果
				}
			}
		}
	}

	//面板颜色
	static class MyPanelColors implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			for(int i = 0; i < jb.length; i++) {
				if("红色".equals(e.getActionCommand())) {
					jb[i].setBackground(Color.red);
				}else if("黄色".equals(e.getActionCommand())) {
					jb[i].setBackground(Color.yellow);
				}else if("蓝色".equals(e.getActionCommand())) {
					jb[i].setBackground(Color.blue);
				}else if("绿色".equals(e.getActionCommand())) {
					jb[i].setBackground(Color.green);
				}else if("青色".equals(e.getActionCommand())) {
					jb[i].setBackground(Color.cyan);
				}else if("紫色".equals(e.getActionCommand())) {
					jb[i].setBackground(Color.MAGENTA);
				}else if("黑色".equals(e.getActionCommand())) {
					jb[i].setBackground(Color.black);
				}else if("白色".equals(e.getActionCommand())) {
					jb[i].setBackground(Color.white);
				}else if("灰色".equals(e.getActionCommand())) {
					jb[i].setBackground(Color.gray);
				}
			}
		}
	}
		
	//运算类
	static class MyAction implements ActionListener{
		public void actionPerformed(ActionEvent e) {
			String str;
			try {
				if("C".equals(e.getActionCommand())) {
					jt.setText("");
					jt.setBackground(null);
				}else if("CE".equals(e.getActionCommand())) {
					if(jt.getText().length() >= 0) {
						str = jt.getText();
						str = str.substring(0,str.length()-1);
						jt.setText(str);
					}
				}else if("+".equals(e.getActionCommand())) {
					str = jt.getText();
					numberOne = Double.parseDouble(str);
					jt.setText("");
					count = 0;
				}else if("-".equals(e.getActionCommand())) {
					str = jt.getText();
					numberOne = Double.parseDouble(str);
					jt.setText("");
					count = 1;
				}else if("×".equals(e.getActionCommand())) {
					str = jt.getText();
					numberOne = Double.parseDouble(str);
					jt.setText("");
					count = 2;
				}else if("÷".equals(e.getActionCommand())) {
					str = jt.getText();
					numberOne = Double.parseDouble(str);
					jt.setText("");
					count = 3;
				}else if("ײ".equals(e.getActionCommand())) {
					str = jt.getText();
					numberOne = Double.parseDouble(str);
					 jt.setText("" + (numberOne * numberOne));
					 result = 1;
				}else if("☕".equals(e.getActionCommand())) {
					st = JOptionPane.showInputDialog(null,"输入想说的话：\n",e.getActionCommand(),JOptionPane.PLAIN_MESSAGE); 
					jt.setText(st);
				}else if(".".equals(e.getActionCommand())){
			    	 if(jt.getText().trim().indexOf('.')!=-1){
			    		 
			    	 }else{
			    		 s = jt.getText();
			    		 s = s + e.getActionCommand();
			    		 jt.setText(s);
			    		 }
			    	 }else if("=".equals(e.getActionCommand())) {
			    		 str = jt.getText();
			    		 numberTwo = Double.parseDouble(str);
			    		 jt.setText("");
						 switch(count) {
							 case 0 : jt.setText("" + (numberOne + numberTwo));result = 1;break;
							 case 1 : jt.setText("" + (numberOne - numberTwo));result = 1;break;
							 case 2 : jt.setText("" + (numberOne * numberTwo));result = 1;break;
							 case 3 : if(numberOne == 0 && numberTwo == 0) {
								 	jt.setText("零不能相除!");
								 	break;
								 }else{
									 jt.setText("" + (numberOne / numberTwo));
									 result = 1;
									 break;
								 }
						 }
						 
				}else {
					 if("输入有误!按C键重新输入".equals(jt.getText()) || jt.getText().equals(st)) {
						 jt.setText("");
					 }else if(result ==  1) {		//实现得到结果后在点击，结果清空，有结果为1没结果为0
						 jt.setText("");
						 result = 0;
					 }else if(result == 0) {
						 String s = jt.getText();
				    	 s = s + e.getActionCommand();
				    	 jt.setText(s);
					 }
				}
			}catch(Exception e1) {
				jt.setText("输入有误!按C键重新输入");
			}
		}
	}
	
	public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException {
		String lookAndFeel = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";		//更换主题
		UIManager.setLookAndFeel(lookAndFeel);
		demo();
	}
}

源码地址：https://github.com/Stephen-S0/CalculatorDemo