Program Pengolahan Nilai dengan Java

ini listingnya:

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class nilai extends JFrame implements ActionListener

{

private  JTextField nim,nm,uts,uas,tugas,total;

private  JComboBox semester;

final   String[]    pilih =

          {

              "1",

              "2",

              "3",

              "4",

              "5",

              "6"

                };

private  JRadioButton mi,tk,ka;

   private  JButton hitung,keluar;

    public static void main(String[] args)

    {

    nilai frame=new nilai();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    frame.pack();

    frame.setVisible(true);

    }

    public nilai()

    {

    setTitle("Program Pengolahan Nilai");

    JPanel p1= new JPanel();

    p1.setLayout(new GridLayout(10,1));

    p1.add(new JLabel("NIM Mahasiswa :"));

    p1.add(nim=new JTextField(3));

    p1.add(new JLabel("Nama Mahasiswa :"));

    p1.add(nm=new JTextField(3));

   

    // UNTUK MEMEBUAT RADIOBUTTON

     

      p1.add(new JLabel("Jurusan :"));

       JRadioButton m_sem1 = new JRadioButton ("MI");

       JRadioButton m_sem2 = new JRadioButton ("TK");

       JRadioButton m_sem3 = new JRadioButton ("KA");

       p1.add(m_sem1); 

       p1.add(m_sem2);  

       p1.add(m_sem3);

         

        this.getContentPane().add(p1);

        

        //UNTUK MEMBUAT COMBOBOX

        

        p1.add(new JLabel("Semester :"));

    semester = new JComboBox();

semester.setBounds( 20, 35, 260, 20 );

p1.add( semester );

   

    // Populate the combobox list

for( int iCtr = 0; iCtr < pilih.length; iCtr++ )

   semester.addItem( pilih[iCtr] );

   

   

    p1.add(new JLabel("Nilai UTS :"));

    p1.add(uts=new JTextField(3));

    p1.add(new JLabel("Nilai UAS :"));

    p1.add(uas=new JTextField(3));

    p1.add(new JLabel("Nilai Tugas :"));

    p1.add(tugas=new JTextField(3));

    p1.add(new JLabel("Nilai murni :"));

    p1.add(total=new JTextField(4));

total.setEditable(false);

    

    

   

    Dimension dim=new Dimension (650,400);

    p1.setPreferredSize(dim);

    JPanel p2=new JPanel();

    p2.setLayout(new FlowLayout());

    p2.add(hitung=new JButton("Hitung"));

    p2.add(keluar=new JButton("Keluar"));

    getContentPane().setLayout(new BorderLayout());

    getContentPane().add(p1,BorderLayout.CENTER);

    getContentPane().add(p2,BorderLayout.SOUTH);

    hitung.addActionListener(this);

    keluar.addActionListener(this);

}

public void actionPerformed (ActionEvent e)

{

if (e.getSource()==hitung)

{

double  nuts=(Double.parseDouble(uts.getText().trim()));

double nuas=(Double.parseDouble(uas.getText().trim()));

double ntgs=(Double.parseDouble(tugas.getText().trim()));

double murni=(nuts*0.2)+(nuas*0.3)+(ntgs*0.5);

total.setText(String.valueOf(murni));

}

else if(e.getSource()==keluar)

{

System.exit(0);

}

}

    

}

hasilnya :