1.事件监听
package 事件监听; import java.awt.*; import java.awt.event.*; public class Frame2 extends Frame implements ActionListener{ private Button button1; public Frame2() { super("个人信息"); this.setSize(250,200);//设计组件的尺寸 this.setLocation(800,600);//设计组件显示的位置 this.setBackground(Color.blue);//设计背景颜色 this.setLayout(new FlowLayout());//设计容器为流布局，居中 this.add(new Label("姓名")); this.add(new TextField("唯梦",20)); this.add(new Label("性别")); this.add(new TextField("女",20)); this.add(new Label("民族")); this.add(new TextField("汉",20)); this.add(new Label("年龄")); this.add(new TextField("20",20)); button1=new Button("OK"); this.add(button1); button1.addActionListener(this); this.addWindowListener(new WinClose()); this.setVisible(true); } public void actionPerformed(ActionEvent ev) { if(ev.getSource()==button1) { System.out.print("welcome"); } } public static void main(String arg[]) { new Frame2(); } class WinClose implements WindowListener { public void windowClosing(WindowEvent ev) { System.exit(0); } public void windowOpened(WindowEvent ev) {} public void windowActivated(WindowEvent ev) {} public void windowDeactivated(WindowEvent ev) {} public void windowClose(WindowEvent ev) {} public void windowIconified(WindowEvent ev) {} public void windowDeiconified(WindowEvent ev) {} @Override public void windowClosed(WindowEvent arg0) { // TODO 自动生成的方法存根 } } }
2.计算器界面
package 计算器;import java.awt.BorderLayout; import java.awt.Container; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; public class Jisuanqi extends JFrame { public static void main(String[] args) { Jisuanqi frame = new Jisuanqi(); frame.setTitle("计算器"); frame.setSize(300,400); frame.setResizable(false); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.init(); 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)); Container container = getContentPane(); container.add(textField, 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 (); action(key2); } }); return button; } private void action(char key2) { if(reop) { textField.setText(""); reop = false; } switch(key2) { case '+': a1 = Double.parseDouble(textField.getText()); textField.setText(""); operator = '+'; break; case '-': a1 = Double.parseDouble(textField.getText()); textField.setText(""); operator = '-'; break; case '*': a1= Double.parseDouble(textField.getText()); textField.setText(""); operator = '*'; break; case '/': a1= Double.parseDouble(textField.getText()); textField.setText(""); operator = '/'; break; case '=': reop = true; a2 = Double.parseDouble(textField.getText()); switch(operator) { case '+': result = a1 + a2; break; case '-': result= a1 - a2; break; case '*': result = a1 * a2; break; case '/': result = a1 / a2; break; default: ; } textField.setText(String.valueOf(result)); 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 a1, a2, result; private char operator; private boolean reop = false; }}
转载于:https://www.cnblogs.com/baoyan/p/9220979.html
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