java swing 计算器
简易计算器(可用)
package com.wt010.enjoy; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import java.awt.Font; import java.awt.GridLayout; import java.awt.Image; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; public class Calculator extends JFrame { public static void main(String[] args) { // Create application frame. Calculator frame = new Calculator(); frame.setTitle("Calculator"); frame.setSize(240, 320); frame.setResizable(false); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.setLocationRelativeTo(null); frame.init(); //更改默认java图标 Toolkit tk= Toolkit.getDefaultToolkit(); Image image=tk.createImage("images/b.jpg"); frame.setIconImage(image); // Show frame frame.setVisible(true); } private void init() { textField = new JTextField(); textField.setEditable(false); textField.setHorizontalAlignment (JTextField.RIGHT); JPanel panel = new JPanel(); panel.setLayout(new GridLayout(4, 4)); ImageIcon img =new ImageIcon("images/a.jpg"); JLabel label=new JLabel("sdfsdf"); label.setIcon(img); textField.setBackground(Color.blue); textField.setFont(new Font("黑体",Font.BOLD,19)); textField.setForeground(Color.WHITE); Container container = getContentPane(); container.add(textField, BorderLayout.NORTH); //container.add(label, BorderLayout.NORTH); container.add(panel, BorderLayout.CENTER); panel.add(useButton('7')); panel.add(useButton('8')); panel.add(useButton('9')); panel.add(useButton('+')); panel.add(useButton('4')); panel.add(useButton('5')); panel.add(useButton('6')); panel.add(useButton('-')); panel.add(useButton('1')); panel.add(useButton('2')); panel.add(useButton('3')); panel.add(useButton('*')); panel.add(useButton('0')); panel.add(useButton('.')); panel.add(useButton('=')); panel.add(useButton('/')); } public JButton useButton (final char key) { JButton button = new JButton(String.valueOf(key)); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { JButton btn = (JButton) event.getSource(); char key2 = btn.getText().charAt(0); action(key2); } }); button.addKeyListener(new KeyAdapter() { public void keyReleased(KeyEvent event) { char key2 = event.getKeyChar (); //if(key2 != key) // return; action(key2); } }); return button; } private void action(char key2) { if(reop) { textField.setText(""); reop = false; } switch(key2) { case '+': v1 = Double.parseDouble(textField.getText()); textField.setText(""); operator = '+'; break; case '-': v1 = Double.parseDouble(textField.getText()); textField.setText(""); operator = '-'; break; case '*': v1 = Double.parseDouble(textField.getText()); textField.setText(""); operator = '*'; break; case '/': v1 = Double.parseDouble(textField.getText()); textField.setText(""); operator = '/'; break; case '=': reop = true; v2 = Double.parseDouble(textField.getText()); switch(operator) { case '+': value = v1 + v2; break; case '-': value = v1 - v2; break; case '*': value = v1 * v2; break; case '/': value = v1 / v2; break; default: ; } textField.setText(String.valueOf(value)); break; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': case '0': case '.': String text = textField.getText() + key2; textField.setText(text); break; default: ; } } private JTextField textField; private double v1, v2, value; private char operator; private boolean reop = false; }