class FileDisplayGUIAppAWT extends Frame
1: //FileDisplayGUIAppAWT.java
2: //Loads in a file and displays it in a TextArea.
4: import java.io.*;
5: import java.awt.*;
6: import java.awt.event.*;
8: class FileDisplayGUIAppAWT extends Frame
9: implements ActionListener,
10: WindowListener
11: {
12: private TextArea inputTextArea;
13: private TextField nameField;
14: private Button loadButton;
16: private BufferedReader inFile;
18: public static void main(String[] args)
19: {
20: FileDisplayGUIAppAWT app = new FileDisplayGUIAppAWT();
21: app.setSize(450, 400);
22: app. makeGui();
23: app.setVisible(true);
24: }
26: public void makeGui()
27: {
28: Panel top = new Panel();
30: loadButton =
31: new Button("Click this button to load this file: ");
32: loadButton.addActionListener(this);
33: top.add(loadButton);
35: nameField = new TextField(20);
36: nameField.addActionListener(this);
37: top.add(nameField);
38: add ("North", top);
40: inputTextArea = new TextArea("");
41: add ("Center", inputTextArea);
43: addWindowListener(this);
44: }
46:
47: public void actionPerformed(ActionEvent e)
48: {
49: if (e.getSource() == loadButton)
50: {
51: String fileName = nameField.getText();
52: try
53: {
54: inFile = new
55: BufferedReader(new FileReader(fileName));
56: inputTextArea.setText(""); //Clear the input area
58: String line;
59: while ((line = inFile.readLine()) != null)
60: inputTextArea.append(line + "\n");
61: inputTextArea.setCaretPosition(0);
62: inputTextArea.setEditable(false);
63: inputTextArea.setBackground(Color.white);
64: inFile.close();
65: }
66: catch (IOException eIO)
67: {
68: System.err.println("Error in file " +
69: fileName +
70: ": " + eIO.toString());
71: System.exit(1);
72: }
73: }
74: }
77: public void windowClosing(WindowEvent e)
78: {
79: System.exit(0);
80: }
81: //Empty WindowListener methods
82: public void windowIconified(WindowEvent e) {}
83: public void windowOpened(WindowEvent e) {}
84: public void windowClosed(WindowEvent e) {}
85: public void windowDeiconified(WindowEvent e) {}
86: public void windowActivated(WindowEvent e) {}
87: public void windowDeactivated(WindowEvent e) {}
88: }