import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class KalkulatorUTS_NIM extends JFrame implements ActionListener
{
	private JPanel 		pKalkulator       = new JPanel();

	private JTextField 	fLayar	   = new JTextField (); 
	private JLabel 		labelmhs   = new JLabel ("NIM : 1231 Nama : ABC");

	private JButton 	btnTambah     	= new JButton ("+"), 
						btnKurang	  	= new JButton ("-"), 
						btnC	  	  	= new JButton ("C"),
						btn1  			= new JButton ("1"), 
						btn2  			= new JButton ("2"), 
						btn3  			= new JButton ("3"), 
						btnSama  		= new JButton ();
	
	private String isiLayar = "";
	private String snilai1, snilai2, tombol;  
	private int hasil;

					
	public KalkulatorUTS_NIM() {
		setPreferredSize(new Dimension(500,600));
		setTitle("Kalkulator");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		new BorderLayout();
		JDesktopPane pKalkulator = new JDesktopPane();
		add(pKalkulator, BorderLayout.CENTER);
		
        
		/* Mengatur letak objek Text Di Container */
		fLayar.setBounds (50, 90, 385, 50);
		labelmhs.setBounds (50, 480, 200, 50);

		/* Mengatur letak objek Button di Container */
		btnTambah.setBounds (350, 160, 85, 50);	
		btnKurang.setBounds (350, 230, 85, 50);	
		btnC.setBounds (350, 300, 85, 50);	

		btnSama.setBounds (250, 230, 85, 50);	
		btnSama.setLabel("=");									

		//btnAdd.setToolTipText("Tombol Tambah Data");
		btn1.setBounds (50, 160, 85, 50);
		btn2.setBounds (150, 160, 85, 50);
		btn3.setBounds (250, 160, 85, 50);
		
		fLayar.setHorizontalAlignment (JTextField.RIGHT);

        
		/* Objek Button di Non Aktifkan dan di aktifkan */
		btnTambah.setEnabled(true);		
		

		/* Mengatur objek untuk dapat berinteraksi */
		btn1.addActionListener (this);
		btn2.addActionListener (this);
		btn3.addActionListener (this);

		btnTambah.addActionListener (this);
		btnKurang.addActionListener (this);
		btnC.addActionListener (this);
		btnSama.addActionListener (this);

		
		// Meletakkan seluruh kontrol pada objek panel */
		pKalkulator.add (fLayar);
		pKalkulator.add (labelmhs);
		pKalkulator.add (btn1);
		pKalkulator.add (btn2);
		pKalkulator.add (btn3);


		pKalkulator.add (btnTambah);
		pKalkulator.add (btnKurang);		
		pKalkulator.add (btnC);
		pKalkulator.add (btnSama);

		/* Menambahkan objek panel (pKalkulator) ke container frame */
		getContentPane().add (pKalkulator).setBackground(Color.getHSBColor(0,0,0));
		//(Color.getHSBColor(0,0,0)) silahkan angka 0 di atas diganti dengan 0 s/d 255
		//misal (Color.getHSBColor(10,50,200))
	
		/* Menampilkan frame ke layar monitor */
		pack();
		setVisible (true);
	
	}
	
	public static void main(String[] args) {
		new KalkulatorUTS_NIM().setVisible(true);
	}
	


	/* Fungsi jika user melakukan action penekanan tombol Button */
	public void actionPerformed (ActionEvent ae) {
		Object obj = ae.getSource();

		if (obj == btnC) 	
			{ 
				tombol = ""; snilai1 = ""; snilai2 = "";  
				isiLayar = "";
			 	fLayar.setText(isiLayar); 	
			}
		if (obj == btn1) 	
			{ 
			 	isiLayar = isiLayar + "1";
			 	fLayar.setText(isiLayar); 
			}
		if (obj == btn2) 	
			{ 
			 	isiLayar = isiLayar + "2";
			 	fLayar.setText(isiLayar); 
			}
		if (obj == btn3) 	
			{ 
			 	isiLayar = isiLayar + "123";
			 	fLayar.setText(isiLayar); 
			}			
			
		if (obj == btnTambah) 	
			{ 
				tombol = "tambah";
				snilai1 = fLayar.getText();
				isiLayar = "";
			 	fLayar.setText(isiLayar); 

			}				
		if (obj == btnKurang) 	
			{ 
				tombol = "kurang";
				snilai1 = fLayar.getText();
				isiLayar = "";
			 	fLayar.setText(isiLayar); 	
			}
		if (obj == btnSama) 	
		{ 
			snilai2 = fLayar.getText();
			if (tombol == "tambah")
			{
				hasil = Integer.parseInt(snilai1) + Integer.parseInt(snilai2);
			}
			else
			if (tombol == "kurang")
			{
				hasil = Integer.parseInt(snilai1) - Integer.parseInt(snilai2);
			}
			String shasil = ""+hasil;
			fLayar.setText(shasil);
	
		}			
			
	}

	
	// Fungsi untuk mengkosongkan Objek masukan 
	void Kosong () 
	{
		 fLayar.setText ("");
		 fLayar.requestFocus ();
	}
}