Java|Java绘制制作简易计算器

用Java做的简易计算器

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.Button;
import java.awt.Panel;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Font;
import javax.swing.SwingConstants;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.Window.Type;
import java.awt.Dialog.ModalExclusionType;
import java.awt.Point;
import java.awt.ComponentOrientation;

public class Cal extends JFrame {

	private JPanel contentPane;
	private JTextField text;
	private int i = -1;		//i用来控制小数点的输入
	private String opr;
	private double op1,op2;
	private String result;
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					Cal frame = new Cal();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public Cal() {
		setLocationByPlatform(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setTitle("\u5510\u5B50\u817E\u7684\u8BA1\u7B97\u5668");
		setBounds(100, 100, 315, 430)