Notes

import java.awt.*;
import java.awt.event.*;



public class Hesapmakinesi extends Frame {

private Label lbl;
private TextField tf;
private Label lbl1;
private TextField tf1;
private Label lbl2;
private TextField tf2;
private Button btntop;
private Button btncık;
private Button btnbol;
private Button btncarp;
private Button btnclear;
private int sonuc = 0;

public Hesapmakinesi() {

setLayout(new GridLayout(6, 2, 5, 5));

lbl = new Label("1. Sayı");
add(lbl);

tf = new TextField(5);
add(tf);

lbl1 = new Label("2. Sayı");
add(lbl1);

tf1 = new TextField(5);
add(tf1);

lbl2 = new Label("Results");
add(lbl2);

tf2 = new TextField(sonuc + "", 5);
tf2.setEditable(false);
add(tf2);

btntop = new Button("+");
add(btntop);
btntop listener = new btntop();
btntop.addActionListener(listener);

btncık = new Button("-");
add(btncık);
btncık listener1 = new btncık();
btncık.addActionListener(listener1);

btnbol = new Button("/");
add(btnbol);
btnbol listener2 = new btnbol();
btnbol.addActionListener(listener2);

btncarp = new Button("*");
add(btncarp);
btncarp listener3 = new btncarp();
btncarp.addActionListener(listener3);

btnclear = new Button("Clear");
add(btnclear);
btnclear listener4 = new btnclear();
btnclear.addActionListener(listener4);




addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
});

setSize(300,300);
setVisible(true);
}
public static void main(String[] args) {

Hesapmakinesi app = new Hesapmakinesi();
}

private class btntop implements ActionListener {

@Override
public void actionPerformed(ActionEvent evt) {

String str = tf.getText().trim();
String str1 = tf1.getText().trim();


if(str.isEmpty()||str1.isEmpty()) {
System.out.println("a");
return;
}

int sayı1=Integer.parseInt(tf.getText());
int sayı2=Integer.parseInt(tf1.getText());

sonuc=sayı1+sayı2;

tf2.setText(sonuc+"");


}

}

private class btncık implements ActionListener {

@Override
public void actionPerformed(ActionEvent evt) {

String str = tf.getText().trim();
String str1 = tf1.getText().trim();


if(str.isEmpty()||str1.isEmpty()) {
System.out.println("a");
return;
}

int sayı1=Integer.parseInt(tf.getText());
int sayı2=Integer.parseInt(tf1.getText());

sonuc=sayı1-sayı2;

tf2.setText(sonuc+"");


}}

private class btnbol implements ActionListener {

@Override
public void actionPerformed(ActionEvent evt) {

String str = tf.getText().trim();
String str1 = tf1.getText().trim();


if(str.isEmpty()||str1.isEmpty()) {
System.out.println("a");
return;
}

int sayı1=Integer.parseInt(tf.getText());
int sayı2=Integer.parseInt(tf1.getText());

sonuc=sayı1/sayı2;

tf2.setText(sonuc+"");


}}
private class btncarp implements ActionListener {

@Override
public void actionPerformed(ActionEvent evt) {

String str = tf.getText().trim();
String str1 = tf1.getText().trim();


if(str.isEmpty()||str1.isEmpty()) {
System.out.println("a");
return;
}

int sayı1=Integer.parseInt(tf.getText());
int sayı2=Integer.parseInt(tf1.getText());

sonuc=sayı1*sayı2;

tf2.setText(sonuc+"");


}
}
private class btnclear implements ActionListener {

@Override
public void actionPerformed(ActionEvent evt) {

tf.setText("");
tf1.setText("");
tf2.setText("");

}
}
}