Xử lý sự kiện trong javax.swing

[phuongdo90]

public class abc {

	private JFrame frmCalculate;
	private JTextField textField;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					abc window = new abc();
					window.frmCalculate.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the application.
	 */
	public abc() {
		initialize();
	}

	/**
	 * Initialize the contents of the frame.
	 */
	private void initialize() {		
		frmCalculate = new JFrame();
		frmCalculate.setAlwaysOnTop(true);
		frmCalculate.setTitle("Calculate");
		frmCalculate.setBounds(100, 100, 271, 337);
		frmCalculate.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frmCalculate.getContentPane().setLayout(null);
		
		
		JButton btn1 = new JButton("1");
		btn1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn1.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn1.setBounds(0, 51, 64, 49);
		frmCalculate.getContentPane().add(btn1);
		
		JButton btn2 = new JButton("2");
		btn2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn2.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn2.setBounds(64, 51, 64, 49);
		frmCalculate.getContentPane().add(btn2);
		
		JButton btn3 = new JButton("3");
		btn3.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn3.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn3.setBounds(128, 51, 64, 49);
		frmCalculate.getContentPane().add(btn3);
	
		JButton btnCong = new JButton("+");
		btnCong.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
			}
		});
		btnCong.setBounds(192, 51, 64, 49);
		frmCalculate.getContentPane().add(btnCong);
		
		JButton btn4 = new JButton("4");
		btn4.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn4.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn4.setBounds(0, 100, 64, 49);
		frmCalculate.getContentPane().add(btn4);
		
		JButton btn5 = new JButton("5");
		btn5.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn5.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn5.setBounds(64, 100, 64, 49);
		frmCalculate.getContentPane().add(btn5);
		
		JButton btn6 = new JButton("6");
		btn6.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn6.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn6.setBounds(128, 100, 64, 49);
		frmCalculate.getContentPane().add(btn6);
		
		JButton btnTru = new JButton("-");
		btnTru.setBounds(192, 100, 64, 49);
		frmCalculate.getContentPane().add(btnTru);
		
		JButton btn7 = new JButton("7");
		btn7.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn7.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn7.setBounds(0, 149, 64, 49);
		frmCalculate.getContentPane().add(btn7);
		
		JButton btn8 = new JButton("8");
		btn8.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn8.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn8.setBounds(64, 149, 64, 49);
		frmCalculate.getContentPane().add(btn8);
		
		JButton btn9 = new JButton("9");
		btn9.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn9.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn9.setBounds(128, 149, 64, 49);
		frmCalculate.getContentPane().add(btn9);
		
		JButton btnNhan = new JButton("*");
		btnNhan.setBounds(192, 149, 64, 49);
		frmCalculate.getContentPane().add(btnNhan);
		
		JButton btn0 = new JButton("0");
		btn0.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn0.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn0.setBounds(0, 198, 64, 49);
		frmCalculate.getContentPane().add(btn0);
		
		JButton btnCham = new JButton(".");
		btnCham.setBounds(64, 198, 64, 49);
		frmCalculate.getContentPane().add(btnCham);
		
		JButton btnBang = new JButton("=");
		btnBang.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
			}
		});
		btnBang.setBounds(128, 198, 64, 49);
		frmCalculate.getContentPane().add(btnBang);
		
		JButton btnChia = new JButton("/");
		btnChia.setBounds(192, 198, 64, 49);
		frmCalculate.getContentPane().add(btnChia);
		
		textField = new JTextField();
		textField.setEditable(false);
		textField.setBounds(0, 2, 256, 49);
		frmCalculate.getContentPane().add(textField);
		textField.setColumns(10);
		
		JButton btnXoa = new JButton("C");
		btnXoa.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(null);
			}
		});
		btnXoa.setBounds(0, 247, 256, 49);
		frmCalculate.getContentPane().add(btnXoa);
	}
}

Em mới học java, đang làm chương trình máy tính bỏ túi nhưng không biết xử lý sự kiện của dấu "+" và dấu "=" như thế nào, các anh hướng dẫn giúp em. Em làm kéo thả trong eclipse ạ. [IMG]images/smilies/smile.png[/IMG]

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[ducthangseo]

Cái này mình thêm 1 hàm, và 3 thuộc tính để xử lý, và chưa check sự kiện, nói chung chỉ đơn giản để tính +

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package times;

import com.sun.corba.se.spi.orbutil.fsm.Guard;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class abc {

	private JFrame frmCalculate;
	private JTextField textField;
        
        private Double value1 = 0d;
        private Double value2 = 0d;
        private String regular = "";

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					abc window = new abc();
					window.frmCalculate.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the application.
	 */
	public abc() {
		initialize();
                
	}

	/**
	 * Initialize the contents of the frame.
	 */
	private void initialize() {		
		frmCalculate = new JFrame();
		frmCalculate.setAlwaysOnTop(true);
		frmCalculate.setTitle("Calculate");
		frmCalculate.setBounds(100, 100, 271, 337);
		frmCalculate.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frmCalculate.getContentPane().setLayout(null);
		
		
		JButton btn1 = new JButton("1");
		btn1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn1.getText());
				textField.setText(String.valueOf(so));
			}

		});
		btn1.setBounds(0, 51, 64, 49);
		frmCalculate.getContentPane().add(btn1);
		
		JButton btn2 = new JButton("2");
		btn2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn2.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn2.setBounds(64, 51, 64, 49);
		frmCalculate.getContentPane().add(btn2);
		
		JButton btn3 = new JButton("3");
		btn3.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn3.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn3.setBounds(128, 51, 64, 49);
		frmCalculate.getContentPane().add(btn3);
	
		JButton btnCong = new JButton("+");
		btnCong.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
                            
			}
		});
		btnCong.setBounds(192, 51, 64, 49);
		frmCalculate.getContentPane().add(btnCong);
		
		JButton btn4 = new JButton("4");
		btn4.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn4.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn4.setBounds(0, 100, 64, 49);
		frmCalculate.getContentPane().add(btn4);
		
		JButton btn5 = new JButton("5");
		btn5.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn5.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn5.setBounds(64, 100, 64, 49);
		frmCalculate.getContentPane().add(btn5);
		
		JButton btn6 = new JButton("6");
		btn6.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn6.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn6.setBounds(128, 100, 64, 49);
		frmCalculate.getContentPane().add(btn6);
		
		JButton btnTru = new JButton("-");
		btnTru.setBounds(192, 100, 64, 49);
		frmCalculate.getContentPane().add(btnTru);
		
		JButton btn7 = new JButton("7");
		btn7.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn7.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn7.setBounds(0, 149, 64, 49);
		frmCalculate.getContentPane().add(btn7);
		
		JButton btn8 = new JButton("8");
		btn8.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn8.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn8.setBounds(64, 149, 64, 49);
		frmCalculate.getContentPane().add(btn8);
		
		JButton btn9 = new JButton("9");
		btn9.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn9.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn9.setBounds(128, 149, 64, 49);
		frmCalculate.getContentPane().add(btn9);
		
		JButton btnNhan = new JButton("*");
		btnNhan.setBounds(192, 149, 64, 49);
		frmCalculate.getContentPane().add(btnNhan);
		
		JButton btn0 = new JButton("0");
		btn0.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String gt = textField.getText();
				if(gt.length() < 12)
					if(gt.equals("0"))
						gt = "";
				long so = Long.parseLong(gt + btn0.getText());
				textField.setText(String.valueOf(so));
			}
		});
		btn0.setBounds(0, 198, 64, 49);
		frmCalculate.getContentPane().add(btn0);
		
		JButton btnCham = new JButton(".");
		btnCham.setBounds(64, 198, 64, 49);
		frmCalculate.getContentPane().add(btnCham);
		
		JButton btnBang = new JButton("=");
		btnBang.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
			}
		});
		btnBang.setBounds(128, 198, 64, 49);
		frmCalculate.getContentPane().add(btnBang);
		
		JButton btnChia = new JButton("/");
		btnChia.setBounds(192, 198, 64, 49);
		frmCalculate.getContentPane().add(btnChia);
		
		textField = new JTextField();
		textField.setEditable(false);
		textField.setBounds(0, 2, 256, 49);
		frmCalculate.getContentPane().add(textField);
		textField.setColumns(10);
		
		JButton btnXoa = new JButton("C");
		btnXoa.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(null);
			}
		});
		btnXoa.setBounds(0, 247, 256, 49);
		frmCalculate.getContentPane().add(btnXoa);
                
                addMouseListener(btnCong);
                addMouseListener(btnBang);
	}
        
        private void addMouseListener(final JComponent component) {
        component.addMouseListener(new java.awt.event.MouseAdapter() {
            @Override
            public void mouseClicked(java.awt.event.MouseEvent event) {
                if(!regular.equals("")){
                    value2 = Double.parseDouble(textField.getText());
                    textField.setText(value1+value2 +"");
                }
                if(((JButton) component).getText().equals("+")){
                    regular = "+";
                    value1 = Double.parseDouble(textField.getText());
                    textField.setText(null);
                }
                
            }
        });
    }
}