Temperature Converter (Fahrenheit and Celsius) In Java Swing

Fahrenheit
The freezing point of water is 32 degrees Fahrenheit (°F) and the boiling point 212 °F (at standard atmospheric pressure), placing the boiling and freezing points of water exactly 180 degrees apart.

Celsius
It is an international metric temperature scale on which water freezes at 0° and boils at 100° under normal atmospheric conditions.

Save this file as TempConverter.java.

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01	import java.awt.*;

02	import java.awt.event.*;

03	import javax.swing.*;

04

05	public class TempConverter extends JFrame {

06	JMenuBar menu      = new JMenuBar();

07	JTextField input   = new JTextField(5);

08	JTextField output  = new JTextField(10);

09	JLabel label       = new JLabel("Enter some value");

10	ButtonGroup bgroup = new ButtonGroup();

11	JRadioButton jbuttonCelsius    = new JRadioButton("Celsius");

12	JRadioButton jbuttonFahrenheit = new JRadioButton("Fhrenheit");

13	JButton button     = new JButton("Convert");

14

15

16	JPanel p1 = new JPanel();

17	JPanel p2 = new JPanel();

18	JPanel p3 = new JPanel();

19	boolean setters = true;

20

21	public TempConverter() {

22	input.setText("0");

23	output.setEditable(false);

24	output.setForeground(Color.red);

25	output.setBackground(Color.white);

26	button.setBackground(Color.cyan);

27	jbuttonCelsius.setSelected(true);

28	setTitle("Converter 1.0");

29

30	p1.add(label,BorderLayout.WEST);

31	p1.add(input,BorderLayout.EAST);

32

33	p2.add(jbuttonCelsius,BorderLayout.WEST);

34	jbuttonCelsius.addActionListener(new ActionListener() {

35	public void actionPerformed(ActionEvent e) {Celsius();}

36

});

37

38	p2.add(jbuttonFahrenheit,BorderLayout.EAST);

39	jbuttonFahrenheit.addActionListener(new ActionListener() {

40	public void actionPerformed(ActionEvent e) {Fahrenheit();}

41

});

42

43	p3.add(button);

44	button.addActionListener(new ActionListener() {

45	public void actionPerformed(ActionEvent e) {Compare();}

46

});

47

48	p3.add(output);

49

50	add(p1,BorderLayout.NORTH);

51	add(p2,BorderLayout.CENTER);

52	add(p3,BorderLayout.SOUTH);

53

54	bgroup.add(jbuttonCelsius);

55	bgroup.add(jbuttonFahrenheit);

56

57	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

58

59	setSize(200,120);

60	setResizable(false);

61

62

}

63

64	void Celsius() {

65	setters = true;

66

}

67

68	void Fahrenheit() {

69	setters = false;

70

}

71

72	void Compare(){

73	if(setters == false) {

74	int f = (int)(9*(Double.parseDouble(input.getText()))/5+32);

75	output.setText(" " + f + "  F");

76

}else {

77	int s = (int)(((Double.parseDouble(input.getText()))-32) * 5/9);

78	output.setText(" " + s + "  C");

79

}

80

}

81	public static void main(String args []) {

82

try {

83	UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

84	} catch (Exception e) { }

85

86	final TempConverter s = new TempConverter();

87

s.show();

88

}

89

}

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