Java if statement won't run - Testing to see if a substr(0,1) is == 00
Question
I have a Random Access file that holds records in this format "00, , " - What I'm trying to do is read from the random access file and check to see if there are entries at a particular position ( As written in the code below ). Reading the records is fine but when It reads a record with a substr(0, 1) it will still output the text field GUIS which would normally hold the values I need (Date, Hour, and Client Name) . I've tried changing substr to values[0] which is an array that splits up the variable holds the value of the particular position they searched for. s - This is the variaable that holds the line
My Java FILE - fileWriter.txt the randomAccess file
public class readRandomDataFile extends JFrame implements ActionListener{
private static Path file = Paths.get("fileWriter.txt");
private static String s = "00, , "
+ System.getProperty("line.separator");
private static FileChannel fc = null;
private static int RECSIZE = s.length();
private static JButton submit;
private static JLabel output;
private static JLabel bankDetails;
// private static JTextField txtClient = new JTextField("", 20);
private static JTextField txtDate = new JTextField("",6);
private static JTextField txtClient = new JTextField("",15);
private static JTextField txtHour = new JTextField("",6);
// private static JTextField txtHour = new JTextField("",6);
private static JLabel lblClient = new JLabel("Client");
private static JLabel lblDate = new JLabel("Date");
private static JLabel lblHour = new JLabel("Hour");
private static JLabel noResult = new JLabel("");
private static JLabel lblHeading1 = new JLabel("<html><h1>Meeting Calendar</h1></html>");
private static JLabel lblHeading2 = new JLabel("<html><h2>Enter this months appointment</h2></html>");
private int date;
public readRandomDataFile(){
super("Read Date File");
setSize(300,300);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
output = new JLabel();
submit = new JButton("Submit");
bankDetails = new JLabel();
setLayout(new FlowLayout());
add(lblHeading1);
add(lblHeading2);
// add(lblDate);
// add(txtDate);
// txtClient.addActionListener(this);
add(lblDate);
add(txtDate);
txtDate.addActionListener(this);
// add(lblHour);
// add(txtHour);
// txtHour.addActionListener(this);
add(submit);
submit.addActionListener(this);
add(output);
}
public void actionPerformed(ActionEvent e){
date = Integer.parseInt(txtDate.getText());
Object source = e.getSource();
String strID = "";
if(source == submit){
byte[] data = s.getBytes();
ByteBuffer buffer = ByteBuffer.wrap(data);
try{
fc = (FileChannel)Files.newByteChannel(file, READ, WRITE);
strID = txtDate.getText();
buffer = ByteBuffer.wrap(data);
fc.position(date * RECSIZE);
fc.read(buffer);
s = new String(data);
String[] values = s.split(",", -1);
if(s.substring(0,1).equals(00)){
noResult.setText("No Results Found");
}
else{
output.setText(values[0]);
output.setVisible(false);
add(lblClient);
add(txtClient);
add(lblHour);
add(txtHour);
txtClient.setText(values[1]);
txtHour.setText(values[2]);
//output.setText("Info for ");
}
fc.close();
}
catch(IOException er){
System.out.println("Error connecting to or reading to file");
}
}
}
public static void main(String[] args){
readRandomDataFile one = new readRandomDataFile();
one.setVisible(true);
// int id;
// String strID = "";
// double fee;
}
}
1 answers
solution1
1 2015-05-01 03:00:38
What fixed this was simply changing the
if (s.substring(0,1).equals("00")) {
noResult.setText("No Results Found");
}
TO - I changed the substr(0,1) to (0,2)
if (s.substring(0,2).equals("00")) {
noResult.setText("No Results Found");
}
and also added the GUI for noResult to the JFRAME add(noResult)
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.