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Calculator GUI in java
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import javax.swing.*; | |
import java.awt.event.*; | |
import java.awt.GridLayout; | |
import java.util.*; | |
class CalculatorFrame extends JFrame implements ActionListener{ | |
JTextField screen; | |
JPanel buttonPanel; | |
String operation; | |
Integer result; | |
List<String> operations = Arrays.asList("+","-","*","/","%","C","="); | |
CalculatorFrame(){ | |
screen = new JTextField(); | |
screen.setBounds(10, 10, 200, 30); | |
add(screen); | |
buttonPanel = new JPanel(new GridLayout(5,4)); | |
buttonPanel.setBounds(10,50,200,125); | |
for (int i=0; i<=9; i++) addButton(""+i); | |
for (String op : operations) addButton(op); | |
add(buttonPanel); | |
} | |
void addButton(String txt){ | |
JButton btn = new JButton(txt); | |
btn.addActionListener(this); | |
buttonPanel.add(btn); | |
} | |
void doAction(String op){ | |
if(op=="C"){ | |
screen.setText(""); | |
operation=null; | |
result = 0; | |
return; | |
} | |
String screenText = screen.getText(); | |
if(screenText.length()==0) return; | |
Integer operand = Integer.parseInt(screenText); | |
if(operation!=null){ | |
switch(operation){ | |
case "+": result += operand; break; | |
case "-": result -= operand; break; | |
case "*": result *= operand; break; | |
case "/": | |
try{ | |
result/=operand; | |
}catch(ArithmeticException e){ | |
screen.setText(e.getMessage()); | |
return; | |
} | |
break; | |
case "%": | |
try{ | |
result%=operand; | |
}catch(ArithmeticException e){ | |
screen.setText(e.getMessage()); | |
return; | |
} | |
break; | |
} | |
}else | |
result=operand; | |
if(op=="="){ | |
screen.setText(result.toString()); | |
operation=null; | |
}else{ | |
screen.setText(""); | |
operation=op; | |
} | |
} | |
public void actionPerformed(ActionEvent e){ | |
String sourceText = ((JButton)e.getSource()).getText(); | |
if(operations.contains(sourceText)) | |
doAction(sourceText); | |
else | |
screen.setText(screen.getText()+sourceText); | |
} | |
} | |
class calculator{ | |
public static void main(String[] args) { | |
CalculatorFrame frame = new CalculatorFrame(); | |
frame.setTitle("Calculator"); | |
frame.setLayout(null); | |
frame.setSize(235, 225); | |
frame.setVisible(true); | |
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); | |
} | |
} |
Author
B-R-P
commented
Feb 21, 2023
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