This is a sample code for simple java
calculator.If you hava any questions commect bellow . happy cording.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class calculator extends JFrame implements
ActionListener {
private static final long serialVersionUID = 1L;
JButton btn1 = new JButton("1");
JButton btn2 = new JButton("2");
JButton btn3 = new JButton("3");
JButton btn_arti = new JButton("+");
JButton btn4 = new JButton("4");
JButton
btn5 = new JButton("5");
JButton btn6 = new JButton("6");
JButton btn_eksi = new JButton("-");
JButton btn7 = new JButton("7");
JButton btn8 = new JButton("8");
JButton btn9 = new JButton("9");
JButton btn_carpi = new JButton("*");
JButton btn0 = new JButton("0");
JButton btn_clr = new JButton("CLR");
JButton btn_del = new JButton("DEL");
JButton btn_bolu = new JButton("/");
JButton btn_esit = new JButton("=");
TextField txt=new TextField(15);
String str_number = "";
int
operation = 0;
double int_number1 = 0;
double int_number2 = 0;
double result = 0;
public calculator() {
JFrame frame = new JFrame("CALCULATOR");
frame.setSize(320,320);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setVisible(true);
frame.setLayout(new BorderLayout());
JPanel HeadPanel = new JPanel();
JPanel NumberPanel = new JPanel();
JPanel LabelPanel = new JPanel();
LabelPanel.setBackground(Color.BLACK);
HeadPanel.setBackground(Color.BLUE);
NumberPanel.setLayout(new GridLayout(4,4));
LabelPanel.setLayout(new FlowLayout());
NumberPanel.add(btn1);
btn1.addActionListener(this);
NumberPanel.add(btn2);
btn2.addActionListener(this);
NumberPanel.add(btn3);
btn3.addActionListener(this);
NumberPanel.add(btn_arti);
btn_arti.addActionListener(this);
NumberPanel.add(btn4);
btn4.addActionListener(this);
NumberPanel.add(btn5);
btn5.addActionListener(this);
NumberPanel.add(btn6);
btn6.addActionListener(this);
NumberPanel.add(btn_eksi);
btn_eksi.addActionListener(this);
NumberPanel.add(btn7);
btn7.addActionListener(this);
NumberPanel.add(btn8);
btn8.addActionListener(this);
NumberPanel.add(btn9);
btn9.addActionListener(this);
NumberPanel.add(btn_carpi);
btn_carpi.addActionListener(this);
NumberPanel.add(btn0);
btn0.addActionListener(this);
NumberPanel.add(btn_clr);
btn_clr.addActionListener(this);
NumberPanel.add(btn_del);
btn_del.addActionListener(this);
NumberPanel.add(btn_bolu);
btn_bolu.addActionListener(this);
LabelPanel.add(new JLabel("NUMBER : "));
LabelPanel.add(txt);
LabelPanel.add(btn_esit);
btn_esit.addActionListener(this);
txt.setEditable(false);
btn_del.setEnabled(false);
HeadPanel.add(new JLabel("^^ SIMPLE JAVA CALCULATOR ^^"));
frame.add(HeadPanel,BorderLayout.NORTH);
frame.add(NumberPanel,BorderLayout.CENTER);
frame.add(LabelPanel,BorderLayout.SOUTH);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==btn1) {
txt.setText("1");
str_number+=txt.getText();
txt.setText(str_number); }
else if(e.getSource()==btn2) {
txt.setText("2");
str_number+=txt.getText();
txt.setText(str_number); }
else if(e.getSource()==btn3) {
txt.setText("3");
str_number+=txt.getText();
txt.setText(str_number); }
else if(e.getSource()==btn4) {
txt.setText("4");
str_number+=txt.getText();
txt.setText(str_number); }
else if(e.getSource()==btn5) {
txt.setText("5");
str_number+=txt.getText();
txt.setText(str_number); }
else if(e.getSource()==btn6) {
txt.setText("6");
str_number+=txt.getText();
txt.setText(str_number); }
else if(e.getSource()==btn7) {
txt.setText("7");
str_number+=txt.getText();
txt.setText(str_number); }
else if(e.getSource()==btn8) {
txt.setText("8");
str_number+=txt.getText();
txt.setText(str_number); }
else if(e.getSource()==btn9) {
txt.setText("9");
str_number+=txt.getText();
txt.setText(str_number); }
else if(e.getSource()==btn0) {
txt.setText("0");
str_number+=txt.getText();
txt.setText(str_number); }
else if(e.getSource()==btn_arti) {
if(operation==0 & str_number!="") {
int_number1=Integer.parseInt(str_number);
txt.setText("+");
str_number+=txt.getText();
txt.setText(str_number);
operation=1;
}
else { txt.setText(str_number); }
}
else if(e.getSource()==btn_eksi) {
if(operation==0 & str_number!="") {
int_number1=Integer.parseInt(str_number);
txt.setText("-");
str_number+=txt.getText();
txt.setText(str_number);
operation=2;
}
else { txt.setText(str_number); }
}
else if(e.getSource()==btn_carpi) {
if(operation==0 & str_number!="") {
int_number1=Integer.parseInt(str_number);
txt.setText("*");
str_number+=txt.getText();
txt.setText(str_number);
operation=3;
}
else { txt.setText(str_number); }
}
else if(e.getSource()==btn_bolu) {
if(operation==0 &
str_number!="") {
int_number1=Integer.parseInt(str_number);
txt.setText("/");
str_number+=txt.getText();
txt.setText(str_number);
operation=4;
}
else { txt.setText(str_number);
}
}
else if(e.getSource()==btn_esit) {
if(operation!=0 & str_number!="") {
txt.setText("=");
str_number+=txt.getText();
txt.setText(str_number);
switch(operation) {
case 1: {
String[] kelime = null;
kelime =
str_number.split("\\+");
int_number2=Integer.parseInt(kelime[1].replace("=",""));
result=int_number1+int_number2;
txt.setText(str_number+Double.toString(result));
break;
}
case 2: {
String[] kelime = null;
kelime = str_number.split("\\-");
int_number2=Integer.parseInt(kelime[1].replace("=",""));
result=int_number1-int_number2;
txt.setText(str_number+Double.toString(result));
break;
}
case 3: {
String[] kelime = null;
kelime =
str_number.split("\\*");
int_number2=Integer.parseInt(kelime[1].replace("=",""));
result=int_number1*int_number2;
txt.setText(str_number+Double.toString(result));
break;
}
case 4: {
String[] kelime = null;
kelime =
str_number.split("\\/");
int_number2=Integer.parseInt(kelime[1].replace("=",""));
result=int_number1/int_number2;
txt.setText(str_number+Double.toString(result));
break;
}
}
btn0.setEnabled(false);
btn1.setEnabled(false);
btn2.setEnabled(false);
btn3.setEnabled(false);
btn4.setEnabled(false);
btn5.setEnabled(false);
btn6.setEnabled(false);
btn7.setEnabled(false);
btn8.setEnabled(false);
btn9.setEnabled(false);
btn_arti.setEnabled(false);
btn_eksi.setEnabled(false);
btn_carpi.setEnabled(false);
btn_bolu.setEnabled(false);
btn_esit.setEnabled(false);
}
else { txt.setText("ERROR"); }
}
else if(e.getSource()==btn_clr) {
txt.setText("");
str_number = "";
operation = 0;
int_number1 = 0;
int_number2 = 0;
result = 0;
btn0.setEnabled(true);
btn1.setEnabled(true);
btn2.setEnabled(true);
btn3.setEnabled(true);
btn4.setEnabled(true);
btn5.setEnabled(true);
btn6.setEnabled(true);
btn7.setEnabled(true);
btn8.setEnabled(true);
btn9.setEnabled(true);
btn_arti.setEnabled(true);
btn_eksi.setEnabled(true);
btn_carpi.setEnabled(true);
btn_bolu.setEnabled(true);
btn_esit.setEnabled(true);
}
//else if(e.getSource()==btn_del) {
//}
}
public static void main(String[] args) {
new calculator();
}
}
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