How to Store something in a text file.

Question

Store the record of the session in a text file.
please can any one tell me how can i create this thing.
i cerate the button but does not work correctly and i can not save any calculation/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.Math.*;
import java.math.BigInteger;
public class Calculator2 extends JFrame implements ActionListener{
JLabel lN1, lN2,lN3;//here are the Label.
JTextField tN1, tN2;// here the place for the text field.
JButton btnAdd,btnSub,btnMul,btnDiv,btnClear,btnSave; JTextArea outArea;//all our Button which are in the program.
Calculator2(){//constructor.
Box box=Box.createVerticalBox();//creation of the box.
// input
lN1=new JLabel("Write first number"); box.add(lN1);//creation of the input,the number which we want use.
tN1=new JTextField(100); tN1.setEditable(true); box.add(tN1);//allows or prevents the user editing the text
lN2=new JLabel("write second number"); box.add(lN2);
tN2=new JTextField(100); tN2.setEditable(true); box.add(tN2);
// buttons
btnAdd=new JButton("+"); btnAdd.addActionListener(this); box.add(btnAdd);// button of addition operation
// setPreferredSize();
btnSub=new JButton("-"); btnSub.addActionListener(this); box.add(btnSub);// button of subtraction operation
btnMul=new JButton("*"); btnMul.addActionListener(this); box.add(btnMul);// button of multiplication operation
btnDiv=new JButton("/"); btnDiv.addActionListener(this); box.add(btnDiv);// button of division operation
btnClear=new JButton("Clear"); btnClear.addActionListener(this); box.add(btnClear);// button of Clear operation
btnSave=new JButton("Save"); btnSave.addActionListener(this); box.add(btnSave);// button of save operation
// Output
String desc="This is a simple integer calculator\n";//here the out put with text area.
outArea=new JTextArea(desc,30,60);//out put area with the hight and length.
ScrollPane scrollPane=new ScrollPane();//Creates an empty (no viewport view) JScrollPane where both horizontal and vertical scrollbars appear when needed
scrollPane.add(outArea);
box.add(scrollPane);
Container c=getContentPane();
c.add(box);
c.setBackground(Color.green);//back ground color.
setTitle("Calculator");//title
setSize(600,375);//size
setVisible(true);// visiblity of the program.
private void showStatus(String status) {
lN3.setText(status);
public void actionPerformed(ActionEvent actionEvent){
if(actionEvent.getSource()==btnClear){
outArea.selectAll(); outArea.cut();
} else {
String sN1=tN1.getText(), sN2=tN2.getText(), sOp="";
BigInteger bN1=new BigInteger(sN1);
BigInteger bN2=new BigInteger(sN2);
BigInteger bRes=BigInteger.ZERO, bResDiv[]={BigInteger.ZERO,BigInteger.ZERO};
BigInteger bRemainder=BigInteger.ZERO;
if(actionEvent.getSource()==btnAdd){bRes=bN1.add(bN2); sOp=" + ";}
if(actionEvent.getSource()==btnSub){bRes=bN1.subtract(bN2); sOp=" - ";}
if(actionEvent.getSource()==btnMul){bRes=bN1.multiply(bN2); sOp=" * ";}
if(actionEvent.getSource()==btnDiv){sOp=" / ";
            if(bN2.signum()!=0)bResDiv=bN1.divideAndRemainder(bN2);//Math.signum() tells you what sign a number is....
            //returns zero if the argument is zero, 1.0 if the argument is greater than zero,
            //-1.0 if the argument is less than zero
            bRes=bResDiv[0]; bRemainder=bResDiv[1];
if(sOp.equals(" / ") && bN2.signum()==0){
// showStatus("Cannot divide by zero");
} else {
outArea.append(bN1.toString() + sOp+bN2.toString() + " = " + bRes.toString() + "\n");
if(actionEvent.getSource()==btnDiv)outArea.append("Remainder = "+bRemainder.toString()+"\n");
public static void main(String[] args) {//the main method of the program.
new Calculator2().setVisible(true);
}

Answer 1

// This is a simple calculator that calculate 4 mathematical operations, addition,
// subtraction, multiplication and division.
// Author: Jean Chedid.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.Math.*;
import java.math.BigInteger;
public class Calculator2 extends JFrame implements ActionListener{
    JLabel lN1, lN2,lN3;//here are the Label.
    JTextField tN1, tN2;// here the place for the text field.
    JButton btnAdd,btnSub,btnMul,btnDiv,btnClear,btnSave; JTextArea outArea;//all our Button which are in the program.
    Calculator2(){//constructor.
        Box box=Box.createVerticalBox();//creation of the box.
        // input
        lN1=new JLabel("Write first number"); box.add(lN1);//creation of the input,the number which we want use.
        tN1=new JTextField(100); tN1.setEditable(true); box.add(tN1);//allows or prevents the user editing the text
        lN2=new JLabel("write second number"); box.add(lN2);
        tN2=new JTextField(100); tN2.setEditable(true); box.add(tN2);
        // buttons
        btnAdd=new JButton("+"); btnAdd.addActionListener(this); box.add(btnAdd);// button of addition operation
        // setPreferredSize();
        btnSub=new JButton("-"); btnSub.addActionListener(this); box.add(btnSub);// button of subtraction operation
        btnMul=new JButton("*"); btnMul.addActionListener(this); box.add(btnMul);// button of multiplication operation
        btnDiv=new JButton("/"); btnDiv.addActionListener(this); box.add(btnDiv);// button of division operation
        btnClear=new JButton("Clear"); btnClear.addActionListener(this); box.add(btnClear);// button of Clear operation
        btnSave=new JButton("Save"); btnSave.addActionListener(this); box.add(btnSave);// button of save operation
        // Output
        String desc="This is a simple integer calculator\n";//here the out put with text area.
        outArea=new JTextArea(desc,30,60);//out put area with the hight and length.
        ScrollPane scrollPane=new ScrollPane();//Creates an empty (no viewport view) JScrollPane where both horizontal and vertical scrollbars appear when needed
        scrollPane.add(outArea);
        box.add(scrollPane);
        Container c=getContentPane();
        c.add(box);
        c.setBackground(Color.green);//back ground color.
        setTitle("Calculator");//title
        setSize(600,375);//size
        setVisible(true);// visiblity of the program.
     private void showStatus(String status) {
     lN3.setText(status);
    public void actionPerformed(ActionEvent actionEvent){
        if(actionEvent.getSource()==btnClear){
            outArea.selectAll(); outArea.cut();
        } else {
            String sN1=tN1.getText(), sN2=tN2.getText(), sOp="";
            BigInteger bN1=new BigInteger(sN1);
            BigInteger bN2=new BigInteger(sN2);
            BigInteger bRes=BigInteger.ZERO, bResDiv[]={BigInteger.ZERO,BigInteger.ZERO};
            BigInteger bRemainder=BigInteger.ZERO;
            if(actionEvent.getSource()==btnAdd){bRes=bN1.add(bN2); sOp=" + ";}
            if(actionEvent.getSource()==btnSub){bRes=bN1.subtract(bN2); sOp=" - ";}
            if(actionEvent.getSource()==btnMul){bRes=bN1.multiply(bN2); sOp=" * ";}
            if(actionEvent.getSource()==btnDiv){sOp=" / ";
            if(bN2.signum()!=0)bResDiv=bN1.divideAndRemainder(bN2);//Math.signum() tells you what sign a number is....
            //returns zero if the argument is zero, 1.0 if the argument is greater than zero,
            //-1.0 if the argument is less than zero
            bRes=bResDiv[0]; bRemainder=bResDiv[1];
            if(sOp.equals(" / ") && bN2.signum()==0){
                // showStatus("Cannot divide by zero");
            } else {
                outArea.append(bN1.toString() + sOp+bN2.toString() + " = " + bRes.toString() + "\n");
                if(actionEvent.getSource()==btnDiv)outArea.append("Remainder = "+bRemainder.toString()+"\n");
    public static void main(String[] args) {//the main method of the program.
        new Calculator2().setVisible(true);
}