Write data to .txt file in JAVA?
29,901
Solution 1
check java I/O api. Below is an example of writing data to file.
BufferedWriter writer = null;
try {
writer = new BufferedWriter(new FileWriter("./output.txt"));
writer.write("your data here");
} catch (IOException e) {
System.err.println(e);
} finally {
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
System.err.println(e);
}
}
}
Solution 2
PrintWriter pw = new PrintWriter(new FileWriter("c:\\output.txt");
pw.println("The value is: " + x);
pw.close();
Author by
Philip McQuitty
Updated on August 05, 2020Comments
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Philip McQuitty almost 4 years
I was wondering if it is in JAVA to write the calculated data to a text file. My JAVA code is a GUI based gpa calculator. I just want to add a JButton & ActionListener that will write the Class Name, GPA Points, and calculated GPA to a .txt file.
Here is my JFrame Driver Code:
import javax.swing.JFrame; public class Driver00 { public static void main(String[] args) { /* * Create a frame (outside box) and write what text * will be displayed as the frame title */ JFrame frame = new JFrame("PHILIP MCQUITTY"); // give frame a size frame.setSize(520, 375); // set location on the computer screen will frame appear frame.setLocation(400, 166); // use this so when you press X in corner, frame will close frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Add your panel to the frame. name must match Panel class name frame.setContentPane(new GpaCalc()); // frame.setResizable(false); // always include frame.setVisible(true); } }
Here is my JPanel Code:
import javax.swing.*; import java.awt.*; import java.awt.event.*; public class GpaCalc extends JPanel { private JLabel GPALabel, c1, c2, c3, c4, c5, c6, c7, g1, g2, g3, g4, g5, g6, g7; private JTextField Class1, Class2, Class3, Class4, Class5, Class6, Class7, Grade1, Grade2, Grade3, Grade4, Grade5, Grade6, Grade7; private double GPA1, GPA2, GPA3, GPA4, GPA5, GPA6, GPA7, GPA, BigDec; public GpaCalc() { setLayout(new FlowLayout()); // Class Labels GPALabel = new JLabel("0.00000000000000"); GPALabel.setFont(new Font("Times New Roman", Font.BOLD, 60)); GPALabel.setForeground(Color.red); c1 = new JLabel("Block 1"); c1.setFont(new Font("Times New Roman", Font.BOLD, 20)); c1.setForeground(Color.black); c2 = new JLabel("Block 2"); c2.setFont(new Font("Times New Roman", Font.BOLD, 20)); c2.setForeground(Color.black); c3 = new JLabel("Block 3"); c3.setFont(new Font("Times New Roman", Font.BOLD, 20)); c3.setForeground(Color.black); c4 = new JLabel("Block 4"); c4.setFont(new Font("Times New Roman", Font.BOLD, 20)); c4.setForeground(Color.black); c5 = new JLabel("Block 5"); c5.setFont(new Font("Times New Roman", Font.BOLD, 20)); c5.setForeground(Color.black); c6 = new JLabel("Block 6"); c6.setFont(new Font("Times New Roman", Font.BOLD, 20)); c6.setForeground(Color.black); c7 = new JLabel("Block 7"); c7.setFont(new Font("Times New Roman", Font.BOLD, 20)); c7.setForeground(Color.black); // Grade Labels g1 = new JLabel("GPA Points"); g1.setFont(new Font("Times New Roman", Font.BOLD, 20)); g1.setForeground(Color.black); g2 = new JLabel("GPA Points"); g2.setFont(new Font("Times New Roman", Font.BOLD, 20)); g2.setForeground(Color.black); g3 = new JLabel("GPA Points"); g3.setFont(new Font("Times New Roman", Font.BOLD, 20)); g3.setForeground(Color.black); g4 = new JLabel("GPA Points"); g4.setFont(new Font("Times New Roman", Font.BOLD, 20)); g4.setForeground(Color.black); g5 = new JLabel("GPA Points"); g5.setFont(new Font("Times New Roman", Font.BOLD, 20)); g5.setForeground(Color.black); g6 = new JLabel("GPA Points"); g6.setFont(new Font("Times New Roman", Font.BOLD, 20)); g6.setForeground(Color.black); g7 = new JLabel("GPA Points"); g7.setFont(new Font("Times New Roman", Font.BOLD, 20)); g7.setForeground(Color.black); // Class Textfields Class1 = new JTextField("Enter Class Name", 10); Class1.setHorizontalAlignment(SwingConstants.CENTER); Class2 = new JTextField("Enter Class Name", 10); Class2.setHorizontalAlignment(SwingConstants.CENTER); Class3 = new JTextField("Enter Class Name", 10); Class3.setHorizontalAlignment(SwingConstants.CENTER); Class4 = new JTextField("Enter Class Name", 10); Class4.setHorizontalAlignment(SwingConstants.CENTER); Class5 = new JTextField("Enter Class Name", 10); Class5.setHorizontalAlignment(SwingConstants.CENTER); Class6 = new JTextField("Enter Class Name", 10); Class6.setHorizontalAlignment(SwingConstants.CENTER); Class7 = new JTextField("Enter Class Name", 10); Class7.setHorizontalAlignment(SwingConstants.CENTER); // Grade Textfields Grade1 = new JTextField("0.0", 10); Grade1.setHorizontalAlignment(SwingConstants.CENTER); Grade2 = new JTextField("0.0", 10); Grade2.setHorizontalAlignment(SwingConstants.CENTER); Grade3 = new JTextField("0.0", 10); Grade3.setHorizontalAlignment(SwingConstants.CENTER); Grade4 = new JTextField("0.0", 10); Grade4.setHorizontalAlignment(SwingConstants.CENTER); Grade5 = new JTextField("0.0", 10); Grade5.setHorizontalAlignment(SwingConstants.CENTER); Grade6 = new JTextField("0.0", 10); Grade6.setHorizontalAlignment(SwingConstants.CENTER); Grade7 = new JTextField("0.0", 10); Grade7.setHorizontalAlignment(SwingConstants.CENTER); // Button(s) JButton Calculate = new JButton("Calculate"); Calculate.addActionListener(new Listener()); JButton Reset = new JButton("Reset Fields"); Reset.addActionListener(new Listener2()); // Add(s) add(GPALabel); add(c1); add(Class1); add(Grade1); add(g1); add(c2); add(Class2); add(Grade2); add(g2); add(c3); add(Class3); add(Grade3); add(g3); add(c4); add(Class4); add(Grade4); add(g4); add(c5); add(Class5); add(Grade5); add(g5); add(c6); add(Class6); add(Grade6); add(g6); add(c7); add(Class7); add(Grade7); add(g7); add(Calculate); add(Reset); } // Action Listener(s) private class Listener implements ActionListener { public void actionPerformed(ActionEvent e) { GPA1 = Double.parseDouble(Grade1.getText()); GPA2 = Double.parseDouble(Grade2.getText()); GPA3 = Double.parseDouble(Grade3.getText()); GPA4 = Double.parseDouble(Grade4.getText()); GPA5 = Double.parseDouble(Grade5.getText()); GPA6 = Double.parseDouble(Grade6.getText()); GPA7 = Double.parseDouble(Grade7.getText()); GPA = (GPA1 + GPA2 + GPA3 + GPA4 + GPA5 + GPA6 + GPA7) / 7; GPALabel.setText("" + GPA); } } private class Listener2 implements ActionListener { public void actionPerformed(ActionEvent e) { Class1.setText("Enter Class Name"); Class2.setText("Enter Class Name"); Class3.setText("Enter Class Name"); Class4.setText("Enter Class Name"); Class5.setText("Enter Class Name"); Class6.setText("Enter Class Name"); Class7.setText("Enter Class Name"); Grade1.setText("0.0"); Grade2.setText("0.0"); Grade3.setText("0.0"); Grade4.setText("0.0"); Grade5.setText("0.0"); Grade6.setText("0.0"); Grade7.setText("0.0"); GPALabel.setText("0.00000000000000"); } } }