Displaying HTML documents and accessing the web - An Introduction to Graphical User Interfaces with Java Swing - page 264

66.

urlField = new JTextField();

67.

urlField.setText(URLname);

68.

backButton = new JButton("Back");

69.

goButton = new JButton("GO!");

70.

JLabel ulab = new JLabel(" URL:");

71.

urlField.setPreferredSize( new Dimension(300,30));

72.

this .add(backButton);

73.

this .add(ulab);

74.

this .add(urlField);

75.

this .add(goButton);

76.

ButtonListener buli = new ButtonListener();

77.

backButton.addActionListener(buli);

78.

goButton.addActionListener(buli);

79.

}// constructor

80.
81.

public String getURL(){

82. return (urlField.getText().trim());

83. }

84. }// internal class

85.
86.

private class ButtonListener implements ActionListener{

87. public void actionPerformed(ActionEvent actevt){

88.

String command = actevt.getActionCommand();

89.

if (command.equals("Back"))

90.

{

91.

if (urlStack.size() > 0)

92.

{

93.

URL url = (URL)urlStack.pop();

94.

try

95.

{

96.

ediPane.setPage(url);

97.

}

98.

catch (Exception ex)

99.

{

100.

System.out.println("Problem in Back: URL not found.");

101.

}

102. }

103. }

104. else if (command.equals("GO!"))

105. {

106. try

107. {

108. URL url = new URL(tools.getURL());

109. urlStack.removeAllElements();

110.

ediPane.setPage(url);

111.

}