java simple calculator source code
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package GUI;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
public class Basiccal {
public static void main(String[] args) {
clabody cal = new clabody();
}
}
class clabody extends JFrame {
double fn , sn , sum ;
String what ;
clabody() {
setVisible(true);
setTitle("My Cal");
setSize(300, 400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
BorderLayout bd = new BorderLayout();
JPanel p1 = new JPanel();
//p1.setBackground(Color.red);
JPanel p2 = new JPanel();
p2.setBackground(Color.GREEN);
add(p1, BorderLayout.NORTH);
add(p2, BorderLayout.CENTER);
TextField t1 = new TextField(15);
t1.setFont(new Font("", 0, 30));
p1.add(t1);
GridLayout gl = new GridLayout(3, 3);
p2.setLayout(gl);
Button b1 = new Button("1");
// b1.setBackground(Color.red);
p2.add(b1);
b1.setFont(new Font("", 0, 30));
b1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String v = t1.getText(); //0123
v += "1"; // 01231 +
t1.setText(v);
}
});
Button b2 = new Button("2");
//b2.setBackground(Color.BLUE);
p2.add(b2);
b2.setFont(new Font("", 0, 30));
b2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String v = t1.getText(); //0123
v += "2"; // 01231 +
t1.setText(v);
}
});
Button b3 = new Button("3");
// b3.setBackground(Color.GRAY);
p2.add(b3);
b3.setFont(new Font("", 0, 30));
b3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String v = t1.getText(); //0123
v += "3"; // 01231 +
t1.setText(v);
}
});
Button b4 = new Button("4");
// b4.setBackground(Color.ORANGE);
p2.add(b4);
b4.setFont(new Font("", 0, 30));
b4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String v = t1.getText(); //0123
v += "4"; // 01231 +
t1.setText(v);
}
});
Button b5 = new Button("5");
// b5.setBackground(Color.DARK_GRAY);
p2.add(b5);
b5.setFont(new Font("", 0, 30));
b5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String v = t1.getText(); //0123
v += "5"; // 01231 +
t1.setText(v);
}
});
Button b6 = new Button("6");
// b6.setBackground(Color.PINK);
p2.add(b6);
b6.setFont(new Font("", 0, 30));
b6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String v = t1.getText(); //0123
v += "6"; // 01231 +
t1.setText(v);
}
});
Button b7 = new Button("7");
// b7.setBackground(Color.red);
p2.add(b7);
b7.setFont(new Font("", 0, 30));
b7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String v = t1.getText(); //0123
v += "7"; // 01231 +
t1.setText(v);
}
});
Button b8 = new Button("8");
// b8.setBackground(Color.darkGray);
p2.add(b8);
b8.setFont(new Font("", 0, 30));
b8.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String v = t1.getText(); //0123
v += "8"; // 01231 +
t1.setText(v);
}
});
Button b9 = new Button("9");
// b9.setBackground(Color.cyan);
p2.add(b9);
b9.setFont(new Font("", 0, 30));
b9.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String v = t1.getText(); //0123
v += "9"; // 01231 +
t1.setText(v);
}
});
Button b0 = new Button("0");
p2.add(b0);
b0.setFont(new Font("", 0, 30));
b0.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String v = t1.getText(); //0123
v += "0"; // 01231 +
t1.setText(v);
}
});
Button dot = new Button(".");
p2.add(dot);
dot.setFont(new Font("", 0, 30));
dot.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String v = t1.getText(); //0123
v += "."; // 01231 +
t1.setText(v);
}
});
Button clr = new Button("C");
p2.add(clr);
clr.setFont(new Font("", 0, 30));
clr.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
t1.setText("");
fn = 0.0;
sn = 0.0;
what= "";
}
});
Button plus = new Button("+");
p2.add(plus);
plus.setFont(new Font("", 0, 30));
plus.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
fn = Double.parseDouble(t1.getText()) ;
System.out.print(fn);
t1.setText("");
what = "+";
System.out.print(what);
}
});
Button min = new Button("-");
p2.add(min);
min.setFont(new Font("", 0, 30));
min.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
fn = Double.parseDouble(t1.getText()) ;
System.out.print(fn);
t1.setText("");
what = "-";
System.out.print(what);
}
});
Button mul = new Button("*");
p2.add(mul);
mul.setFont(new Font("", 0, 30));
mul.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
fn = Double.parseDouble(t1.getText()) ;
System.out.print(fn);
t1.setText("");
what = "*";
System.out.print(what);
}
});
Button devi = new Button("/");
p2.add(devi);
devi.setFont(new Font("", 0, 30));
devi.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
fn = Double.parseDouble(t1.getText()) ;
System.out.print(fn);
t1.setText("");
what = "/";
System.out.print(what);
}
});
Button sqr = new Button("√");
p2.add(sqr);
sqr.setFont(new Font("", 0, 30));
sqr.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
// math.sqtr();
double sq = Double.valueOf(t1.getText());
double ans = Math.sqrt(sq) ;
System.out.println(ans);
t1.setText(String.valueOf(ans));
}
});
Button qe = new Button("=");
p2.add(qe);
qe.setFont(new Font("", 0, 30));
qe.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sn = Double.parseDouble(t1.getText()) ;
System.out.print(sn);
sum = cal(fn, sn, what);
System.out.println(" = " +sum);
t1.setText(String.valueOf(sum));
}
});
MenuBar mb = new MenuBar();
setMenuBar(mb);
Menu m1 = new Menu("File");
Menu m2 = new Menu("Edit");
Menu m3 = new Menu("View");
mb.add(m1);
mb.add(m2);
mb.add(m3);
MenuItem m_new = new MenuItem("New File");
MenuItem m_save = new MenuItem("Save");
MenuItem m_Exit = new MenuItem("Exit");
m1.add(m_new);
m1.add(m_save);
m1.add(m_Exit);
m_Exit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(rootPane, "Hi iam java...!!");
}
});
}
public double cal(double a , double b ,String w){
double tot = 0;
if (w.equals("+")) {
tot = a+ b;
} else if(w.equals("-")) {
tot = a - b;
} else if(w.equals("*")) {
tot = a * b;
} else if(w.equals("/")) {
tot = a / b;
}
return tot ;
}
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