java图形界面 计算器实现
编写程序实现一个简单计算器的基本功能,具体可以模仿Windows附件中的计算器或模拟常见的实物计算器。
package beizi; import java.awt.EventQueue; import javax.swing.JFrame; import javax.script.ScriptEngine; import javax.script.ScriptEngineManager; import javax.swing.JButton; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import javax.swing.JTextArea; import javax.swing.JTextPane; import javax.swing.JLabel; import javax.swing.JOptionPane; import java.awt.TextArea; import java.awt.Color; import javax.swing.JTextField; public class cal { private JFrame frame; private JTextField textField; private JTextField textField_1; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { cal window = new cal(); window.frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the application. */ public cal() { initialize(); // calResult(); } /** * Initialize the contents of the frame. */ private void initialize() { frame = new JFrame(); frame.setBounds(100, 100, 450, 400); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().setLayout(null); JButton btnNewButton = new JButton("1"); btnNewButton.setBackground(Color.LIGHT_GRAY); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"1"); } }); btnNewButton.setBounds(33, 142, 68, 38); frame.getContentPane().add(btnNewButton); JButton button = new JButton("4"); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"4"); } }); button.setBackground(Color.LIGHT_GRAY); button.setBounds(33, 194, 68, 38); frame.getContentPane().add(button); JButton button_1 = new JButton("7"); button_1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"7"); } }); button_1.setBackground(Color.LIGHT_GRAY); button_1.setBounds(33, 242, 68, 38); frame.getContentPane().add(button_1); JButton button_2 = new JButton("2"); button_2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"2"); } }); button_2.setBackground(Color.LIGHT_GRAY); button_2.setBounds(111, 142, 68, 38); frame.getContentPane().add(button_2); JButton button_3 = new JButton("5"); button_3.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"5"); } }); button_3.setBackground(Color.LIGHT_GRAY); button_3.setBounds(111, 194, 68, 38); frame.getContentPane().add(button_3); JButton button_4 = new JButton("8"); button_4.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"8"); } }); button_4.setBackground(Color.LIGHT_GRAY); button_4.setBounds(111, 242, 68, 38); frame.getContentPane().add(button_4); JButton button_5 = new JButton("3"); button_5.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"3"); } }); button_5.setBackground(Color.LIGHT_GRAY); button_5.setBounds(189, 142, 68, 38); frame.getContentPane().add(button_5); JButton button_6 = new JButton("6"); button_6.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"6"); } }); button_6.setBackground(Color.LIGHT_GRAY); button_6.setBounds(189, 194, 68, 38); frame.getContentPane().add(button_6); JButton button_7 = new JButton("9"); button_7.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"9"); } }); button_7.setBackground(Color.LIGHT_GRAY); button_7.setBounds(189, 242, 68, 38); frame.getContentPane().add(button_7); JButton button_8 = new JButton("0"); button_8.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"0"); } }); button_8.setBackground(Color.LIGHT_GRAY); button_8.setBounds(111, 290, 68, 38); frame.getContentPane().add(button_8); JButton button_9 = new JButton("("); button_9.setBackground(Color.ORANGE); button_9.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"("); } }); button_9.setBounds(33, 93, 68, 38); frame.getContentPane().add(button_9); JButton button_10 = new JButton(")"); button_10.setBackground(Color.ORANGE); button_10.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+")"); } }); button_10.setBounds(109, 94, 70, 38); frame.getContentPane().add(button_10); JButton button_11 = new JButton("+"); button_11.setBackground(Color.ORANGE); button_11.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"+"); } }); button_11.setBounds(267, 142, 44, 38); frame.getContentPane().add(button_11); JButton button_12 = new JButton("-"); button_12.setBackground(Color.ORANGE); button_12.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"-"); } }); button_12.setBounds(267, 194, 44, 38); frame.getContentPane().add(button_12); JButton button_13 = new JButton("*"); button_13.setBackground(Color.ORANGE); button_13.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"*"); } }); button_13.setBounds(267, 242, 44, 38); frame.getContentPane().add(button_13); JButton button_14 = new JButton("/"); button_14.setBackground(Color.ORANGE); button_14.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"/"); } }); button_14.setBounds(267, 290, 44, 38); frame.getContentPane().add(button_14); JButton button_15 = new JButton("="); button_15.setBackground(Color.GREEN); button_15.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { ScriptEngine js = new ScriptEngineManager().getEngineByName("JavaScript");//将字符串公式转换为计算公式 String formula=textField.getText(); try { textField_1.setText(js.eval(formula).toString()); // textField_1.set }catch(Exception e) { } } }); button_15.setBounds(334, 252, 44, 76); frame.getContentPane().add(button_15); textField = new JTextField(); textField.setBounds(33, 21, 345, 37); frame.getContentPane().add(textField); textField.setColumns(10); textField_1 = new JTextField(); textField_1.setBackground(Color.WHITE); textField_1.setBounds(189, 94, 189, 37); frame.getContentPane().add(textField_1); textField_1.setColumns(10); JButton button_16 = new JButton("C"); button_16.setBackground(Color.MAGENTA); button_16.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); int t=text.length()-1; if(t<0) { JOptionPane.showMessageDialog(null, "已经没有了(("); } else { text=text.substring(0, t); textField.setText(text); } } }); button_16.setBounds(334, 142, 44, 38); frame.getContentPane().add(button_16); JButton button_17 = new JButton("X"); button_17.setBackground(Color.RED); button_17.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { textField.setText(""); textField_1.setText(""); } }); button_17.setBounds(334, 202, 44, 38); frame.getContentPane().add(button_17); JButton button_18 = new JButton("."); button_18.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"."); } }); button_18.setBackground(Color.ORANGE); button_18.setBounds(33, 290, 68, 38); frame.getContentPane().add(button_18); JButton button_19 = new JButton("%"); button_19.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String text=textField.getText(); textField.setText(text+"%"); } }); button_19.setBackground(Color.ORANGE); button_19.setBounds(189, 290, 68, 38); frame.getContentPane().add(button_19); } }
大概的效果,Java初学者,,代码重复严重,以后改,,,