Java/Main.java at master · egpeter20/Java · GitHub

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// Main.java
/* This code Creates a GUI (Graphical User Interface) calculator
 * */

public class Main {

	public static void main(String[] args) {
		JFrameExt f= new JFrameExt();
		f.setSize(600, 200);
		f.setVisible(true);
	}
}

// JFrameExt.java
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.GridLayout;
import java.awt.Color;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JTextField;


public class JFrameExt extends JFrame implements ActionListener {

	private JPanel jpMain = new JPanel();
	private JPanel jp1 = new JPanel();
	private JPanel jp2 = new JPanel();
	private JPanel jp3 = new JPanel();
	private JPanel jp4 = new JPanel();

	private JLabel jlbNum1 = new JLabel("Number 1");
	private JLabel jlbNum2 = new JLabel("Number 2");
	private JLabel jlbResult = new JLabel("Result ");

	private JTextField jtfNum1 = new JTextField(10);
	private JTextField jtfNum2 = new JTextField(10);
	private JTextField jtfResult = new JTextField(10);

	private JButton jbtAdd = new JButton("Add");
	private JButton jbtSub = new JButton("Sub");
	private JButton jbtMult = new JButton("Mult");
	private JButton jbtDiv = new JButton("Div");
	private JButton jbtClear = new JButton("Clear");

	private JMenuBar jmb = new JMenuBar();
	private JMenu jmuOp = new JMenu("Operations");
	private JMenu jmuMisc = new JMenu("Miscellaneous");

	private JMenuItem jmiAdd = new JMenuItem("Add");
	private JMenuItem jmiSub = new JMenuItem("Sub");
	private JMenuItem jmiMult = new JMenuItem("Mult");
	private JMenuItem jmiDiv = new JMenuItem("Div");
	private JMenuItem jmiClear = new JMenuItem("Clear");

	public JFrameExt() {
		jpMain.setBackground(Color.yellow);
		// Create a grid layout manager
		GridLayout gl = new GridLayout(4,1);
		// set jpMain's layout manger
		jpMain.setLayout(gl);

		this.setContentPane(jpMain);
		jpMain.add(jp1);
		jpMain.add(jp2);
		jpMain.add(jp3);
		jpMain.add(jp4);

		jp1.setBackground(Color.red);
		jp2.setBackground(Color.green);
		jp3.setBackground(Color.blue);
		jp4.setBackground(Color.WHITE);

		jp1.add(jlbNum1);
		jp1.add(jtfNum1);
		jp2.add(jlbNum2);
		jp2.add(jtfNum2);
		jp3.add(jlbResult);
		jp3.add(jtfResult);
		jp4.add(jbtAdd);
		jp4.add(jbtSub);
		jp4.add(jbtMult);
		jp4.add(jbtDiv);
		jp4.add(jbtClear);

		jtfResult.setEditable(false); // Making the result read only

		jmb.add(jmuOp);
		jmb.add(jmuMisc);

		jmuOp.add(jmiAdd);
		jmuOp.add(jmiSub);
		jmuOp.add(jmiMult);
		jmuOp.add(jmiDiv);
		jmuMisc.add(jmiClear);
		this.setJMenuBar(jmb); // Menu Bar

		// Register with button
		jbtAdd.addActionListener(this);
		jbtSub.addActionListener(this);
		jbtMult.addActionListener(this);
		jbtDiv.addActionListener(this);
		jbtClear.addActionListener(this);

		// Register with menu items
		jmiAdd.addActionListener(this);
		jmiSub.addActionListener(this);
		jmiMult.addActionListener(this);
		jmiDiv.addActionListener(this);
		jmiClear.addActionListener(this);

	}

	@Override
	public void actionPerformed(ActionEvent ev) {
		System.out.print("ok\n");
		if (ev.getSource() == jbtClear || ev.getSource() == jmiClear) {
			jtfNum1.setText("");
			jtfNum2.setText("");
			jtfResult.setText("");
			return;
		}
		String sNum1 = jtfNum1.getText().trim();
		String sNum2 = jtfNum2.getText().trim();
		double num1=Double.parseDouble(sNum1);
		double num2=Double.parseDouble(sNum2);
		double res=0; // Stand for result
		if (ev.getSource() == jbtAdd || ev.getSource() == jmiAdd ) {
			res = num1+num2;
		}
		else if (ev.getSource() == jbtSub || ev.getSource() == jmiSub) {
			res = num1-num2;
		}
		else if (ev.getSource() == jbtMult || ev.getSource() == jmiMult) {
			res = num1*num2;
		}
		else if (ev.getSource() == jbtDiv || ev.getSource() == jmiDiv) {
			res = num1/num2;
		}
		jtfResult.setText(""+res);
	}
}