Need added Java code to get the Enter key, + key, - key, / key, and * key on key
ID: 3825258 • Letter: N
Question
Need added Java code to get the Enter key, + key, - key, / key, and * key on keyboard to work when hit for the operation.
package Calcc;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
public class Calcc extends JFrame implements ActionListener {
JTextField tfield;
double temp, temp1, result, a;
static double m1, m2;
int k = 1, x = 0, y = 0, z = 0;
char ch;
JButton b1, b2, b3, b4, b5, b6, b7, b8, b9, zero, clr, pow2, pow3, exp,
fac, plus, min, div, log, rec, mul, eq, addSub, dot, mr, mc, mp,
mm, sqrt, sin, cos, tan;
Container cont;
JPanel textPanel, buttonpanel;
Calcc() {
cont = getContentPane();
cont.setLayout(new BorderLayout());
JPanel textpanel = new JPanel();
tfield = new JTextField(25);
tfield.setHorizontalAlignment(SwingConstants.RIGHT);
tfield.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent keyevent) {
char c = keyevent.getKeyChar();
if (c >= '0' && c <= '9') {
} else {
keyevent.consume();
}
}
});
textpanel.add(tfield);
buttonpanel = new JPanel();
buttonpanel.setLayout(new GridLayout(8, 4, 2, 2));
boolean t = true;
mr = new JButton("MR");
buttonpanel.add(mr);
mr.addActionListener(this);
mc = new JButton("MC");
buttonpanel.add(mc);
mc.addActionListener(this);
mp = new JButton("M+");
buttonpanel.add(mp);
mp.addActionListener(this);
mm = new JButton("M-");
buttonpanel.add(mm);
mm.addActionListener(this);
b1 = new JButton("1");
buttonpanel.add(b1);
b1.addActionListener(this);
b2 = new JButton("2");
buttonpanel.add(b2);
b2.addActionListener(this);
b3 = new JButton("3");
buttonpanel.add(b3);
b3.addActionListener(this);
b4 = new JButton("4");
buttonpanel.add(b4);
b4.addActionListener(this);
b5 = new JButton("5");
buttonpanel.add(b5);
b5.addActionListener(this);
b6 = new JButton("6");
buttonpanel.add(b6);
b6.addActionListener(this);
b7 = new JButton("7");
buttonpanel.add(b7);
b7.addActionListener(this);
b8 = new JButton("8");
buttonpanel.add(b8);
b8.addActionListener(this);
b9 = new JButton("9");
buttonpanel.add(b9);
b9.addActionListener(this);
zero = new JButton("0");
buttonpanel.add(zero);
zero.addActionListener(this);
plus = new JButton("+");
buttonpanel.add(plus);
plus.addActionListener(this);
min = new JButton("-");
buttonpanel.add(min);
min.addActionListener(this);
mul = new JButton("*");
buttonpanel.add(mul);
mul.addActionListener(this);
div = new JButton("/");
div.addActionListener(this);
buttonpanel.add(div);
addSub = new JButton("+/-");
buttonpanel.add(addSub);
addSub.addActionListener(this);
dot = new JButton(".");
buttonpanel.add(dot);
dot.addActionListener(this);
eq = new JButton("=");
buttonpanel.add(eq);
eq.addActionListener(this);
rec = new JButton("1/x");
buttonpanel.add(rec);
rec.addActionListener(this);
sqrt = new JButton("Sqrt");
buttonpanel.add(sqrt);
sqrt.addActionListener(this);
log = new JButton("log");
buttonpanel.add(log);
log.addActionListener(this);
sin = new JButton("SIN");
buttonpanel.add(sin);
sin.addActionListener(this);
cos = new JButton("COS");
buttonpanel.add(cos);
cos.addActionListener(this);
tan = new JButton("TAN");
buttonpanel.add(tan);
tan.addActionListener(this);
pow2 = new JButton("x^2");
buttonpanel.add(pow2);
pow2.addActionListener(this);
pow3 = new JButton("x^3");
buttonpanel.add(pow3);
pow3.addActionListener(this);
exp = new JButton("Exp");
exp.addActionListener(this);
buttonpanel.add(exp);
fac = new JButton("n!");
fac.addActionListener(this);
buttonpanel.add(fac);
clr = new JButton("AC");
buttonpanel.add(clr);
clr.addActionListener(this);
cont.add("Center", buttonpanel);
cont.add("North", textpanel);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e) {
String s = e.getActionCommand();
if (s.equals("1")) {
if (z == 0) {
tfield.setText(tfield.getText() + "1");
} else {
tfield.setText("");
tfield.setText(tfield.getText() + "1");
z = 0;
}
}
if (s.equals("2")) {
if (z == 0) {
tfield.setText(tfield.getText() + "2");
} else {
tfield.setText("");
tfield.setText(tfield.getText() + "2");
z = 0;
}
}
if (s.equals("3")) {
if (z == 0) {
tfield.setText(tfield.getText() + "3");
} else {
tfield.setText("");
tfield.setText(tfield.getText() + "3");
z = 0;
}
}
if (s.equals("4")) {
if (z == 0) {
tfield.setText(tfield.getText() + "4");
} else {
tfield.setText("");
tfield.setText(tfield.getText() + "4");
z = 0;
}
}
if (s.equals("5")) {
if (z == 0) {
tfield.setText(tfield.getText() + "5");
} else {
tfield.setText("");
tfield.setText(tfield.getText() + "5");
z = 0;
}
}
if (s.equals("6")) {
if (z == 0) {
tfield.setText(tfield.getText() + "6");
} else {
tfield.setText("");
tfield.setText(tfield.getText() + "6");
z = 0;
}
}
if (s.equals("7")) {
if (z == 0) {
tfield.setText(tfield.getText() + "7");
} else {
tfield.setText("");
tfield.setText(tfield.getText() + "7");
z = 0;
}
}
if (s.equals("8")) {
if (z == 0) {
tfield.setText(tfield.getText() + "8");
} else {
tfield.setText("");
tfield.setText(tfield.getText() + "8");
z = 0;
}
}
if (s.equals("9")) {
if (z == 0) {
tfield.setText(tfield.getText() + "9");
} else {
tfield.setText("");
tfield.setText(tfield.getText() + "9");
z = 0;
}
}
if (s.equals("0")) {
if (z == 0) {
tfield.setText(tfield.getText() + "0");
} else {
tfield.setText("");
tfield.setText(tfield.getText() + "0");
z = 0;
}
}
if (s.equals("AC")) {
tfield.setText("");
x = 0;
y = 0;
z = 0;
}
if (s.equals("log")) {
if (tfield.getText().equals("")) {
tfield.setText("");
} else {
a = Math.log(Double.parseDouble(tfield.getText()));
tfield.setText("");
tfield.setText(tfield.getText() + a);
}
}
if (s.equals("1/x")) {
if (tfield.getText().equals("")) {
tfield.setText("");
} else {
a = 1 / Double.parseDouble(tfield.getText());
tfield.setText("");
tfield.setText(tfield.getText() + a);
}
}
if (s.equals("Exp")) {
if (tfield.getText().equals("")) {
tfield.setText("");
} else {
a = Math.exp(Double.parseDouble(tfield.getText()));
tfield.setText("");
tfield.setText(tfield.getText() + a);
}
}
if (s.equals("x^2")) {
if (tfield.getText().equals("")) {
tfield.setText("");
} else {
a = Math.pow(Double.parseDouble(tfield.getText()), 2);
tfield.setText("");
tfield.setText(tfield.getText() + a);
}
}
if (s.equals("x^3")) {
if (tfield.getText().equals("")) {
tfield.setText("");
} else {
a = Math.pow(Double.parseDouble(tfield.getText()), 3);
tfield.setText("");
tfield.setText(tfield.getText() + a);
}
}
if (s.equals("+/-")) {
if (x == 0) {
tfield.setText("-" + tfield.getText());
x = 1;
} else {
tfield.setText(tfield.getText());
}
}
if (s.equals(".")) {
if (y == 0) {
tfield.setText(tfield.getText() + ".");
y = 1;
} else {
tfield.setText(tfield.getText());
}
}
if (s.equals("+")) {
if (tfield.getText().equals("")) {
tfield.setText("");
temp = 0;
ch = '+';
} else {
temp = Double.parseDouble(tfield.getText());
tfield.setText("");
ch = '+';
y = 0;
x = 0;
}
tfield.requestFocus();
}
if (s.equals("-")) {
if (tfield.getText().equals("")) {
tfield.setText("");
temp = 0;
ch = '-';
} else {
x = 0;
y = 0;
temp = Double.parseDouble(tfield.getText());
tfield.setText("");
ch = '-';
}
tfield.requestFocus();
}
if (s.equals("/")) {
if (tfield.getText().equals("")) {
tfield.setText("");
temp = 1;
ch = '/';
} else {
x = 0;
y = 0;
temp = Double.parseDouble(tfield.getText());
ch = '/';
tfield.setText("");
}
tfield.requestFocus();
}
if (s.equals("*")) {
if (tfield.getText().equals("")) {
tfield.setText("");
temp = 1;
ch = '*';
} else {
x = 0;
y = 0;
temp = Double.parseDouble(tfield.getText());
ch = '*';
tfield.setText("");
}
tfield.requestFocus();
}
if (s.equals("MC")) {
m1 = 0;
tfield.setText("");
}
if (s.equals("MR")) {
tfield.setText("");
tfield.setText(tfield.getText() + m1);
}
if (s.equals("M+")) {
if (k == 1) {
m1 = Double.parseDouble(tfield.getText());
k++;
} else {
m1 += Double.parseDouble(tfield.getText());
tfield.setText("" + m1);
}
}
if (s.equals("M-")) {
if (k == 1) {
m1 = Double.parseDouble(tfield.getText());
k++;
} else {
m1 -= Double.parseDouble(tfield.getText());
tfield.setText("" + m1);
}
}
if (s.equals("Sqrt")) {
if (tfield.getText().equals("")) {
tfield.setText("");
} else {
a = Math.sqrt(Double.parseDouble(tfield.getText()));
tfield.setText("");
tfield.setText(tfield.getText() + a);
}
}
if (s.equals("SIN")) {
if (tfield.getText().equals("")) {
tfield.setText("");
} else {
a = Math.sin(Double.parseDouble(tfield.getText()));
tfield.setText("");
tfield.setText(tfield.getText() + a);
}
}
if (s.equals("COS")) {
if (tfield.getText().equals("")) {
tfield.setText("");
} else {
a = Math.cos(Double.parseDouble(tfield.getText()));
tfield.setText("");
tfield.setText(tfield.getText() + a);
}
}
if (s.equals("TAN")) {
if (tfield.getText().equals("")) {
tfield.setText("");
} else {
a = Math.tan(Double.parseDouble(tfield.getText()));
tfield.setText("");
tfield.setText(tfield.getText() + a);
}
}
if (s.equals("=")) {
if (tfield.getText().equals("")) {
tfield.setText("");
} else {
temp1 = Double.parseDouble(tfield.getText());
switch (ch) {
case '+':
result = temp + temp1;
break;
case '-':
result = temp - temp1;
break;
case '/':
result = temp / temp1;
break;
case '*':
result = temp * temp1;
break;
}
tfield.setText("");
tfield.setText(tfield.getText() + result);
z = 1;
}
}
if (s.equals("n!")) {
if (tfield.getText().equals("")) {
tfield.setText("");
} else {
a = fact(Double.parseDouble(tfield.getText()));
tfield.setText("");
tfield.setText(tfield.getText() + a);
}
}
tfield.requestFocus();
}
double fact(double x) {
int er = 0;
if (x < 0) {
er = 20;
return 0;
}
double i, s = 1;
for (i = 2; i <= x; i += 1.0)
s *= i;
return s;
}
public static void main(String args[]) {
try {
UIManager
.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception e) {
}
Calcc f = new Calcc();
f.setTitle("ScientificCalculator");
f.pack();
f.setVisible(true);
}
}
Explanation / Answer
import java.awt.*; import javax.swing.*; import java.awt.event.*; import javax.swing.event.*; public class ScientificCalculator extends JFrame implements ActionListener { JTextField tfield; double temp, temp1, result, a; static double m1, m2; int k = 1, x = 0, y = 0, z = 0; char ch; JButton b1, b2, b3, b4, b5, b6, b7, b8, b9, zero, clr, pow2, pow3, exp, fac, plus, min, div, log, rec, mul, eq, addSub, dot, mr, mc, mp, mm, sqrt, sin, cos, tan; Container cont; JPanel textPanel, buttonpanel; ScientificCalculator() { cont = getContentPane(); cont.setLayout(new BorderLayout()); JPanel textpanel = new JPanel(); tfield = new JTextField(25); tfield.setHorizontalAlignment(SwingConstants.RIGHT); tfield.addKeyListener(new KeyAdapter() { public void keyTyped(KeyEvent keyevent) { char c = keyevent.getKeyChar(); if (c >= '0' && cRelated Questions
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