用Java编写计算器，代码展示！

用Java编写计算器，代码展示！
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.UIManager;

public class ButtonArrayExample extends JFrame { // 继承窗体类JFrame
/**

• */
  private static final long serialVersionUID = 6626440733001287873L;
  private JTextField textField;

  public static void main(String args[]) {
  try {
  UIManager.setLookAndFeel("");
  } catch (Throwable e) {
  e.printStackTrace();
  }
  ButtonArrayExample frame = new ButtonArrayExample();
  frame.setVisible(true); // 设置窗体可见，默认为不可见
  }

  public ButtonArrayExample() {
  super(); // 继承父类的构造方法
  BorderLayout borderLayout = (BorderLayout) getContentPane().getLayout();
  borderLayout.setHgap(20);
  borderLayout.setVgap(10);
  setTitle("计算器"); // 设置窗体的标题
  setBounds(100, 100, 290, 282); // 设置窗体的显示位置及大小
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 设置窗体关闭按钮的动作为退出
  textField = new JTextField();
  textField.setHorizontalAlignment(SwingConstants.TRAILING);
  textField.setPreferredSize(new Dimension(12, 50));
  getContentPane().add(textField, BorderLayout.NORTH);
  textField.setColumns(10);
  final GridLayout gridLayout = new GridLayout(4, 0); // 创建网格布局管理器对象
  gridLayout.setHgap(5); // 设置组件的水平间距
  gridLayout.setVgap(5); // 设置组件的垂直间距
  JPanel panel = new JPanel(); // 获得容器对象
  panel.setLayout(gridLayout); // 设置容器采用网格布局管理器
  getContentPane().add(panel, BorderLayout.CENTER);
  String[][] names = { { "1", "2", "3", "＋" }, { "4", "5", "6", "－" }, { "7", "8", "9", "×" }, { ".", "0", "=", "÷" } };
  JButton[][] buttons = new JButton[4][4];
  for (int row = 0; row < names.length; row++) {
  for (int col = 0; col < names.length; col++) {
  buttons[row][col] = new JButton(names[row][col]); // 创建按钮对象
  buttons[row][col].addActionListener(new ActionListener() {

              @Override
              public void actionPerformed(ActionEvent e) {
                  JButton button = (JButton) e.getSource();
                  String text = textField.getText();
                  textField.setText(text + button.getText());
              }
          });
          panel.add(buttons[row][col]); // 将按钮添加到面板中
      }
  }

  }

}
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