Contoh Program Java Menggunakan Kelas JSlider

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// Nama kelas : DemoJSlider.java
// Mendemonstrasikan penggunaan kelas JSlider

// Mengimpor kelas
import java.awt.*;
import java.util.Hashtable;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;

// Deklarasi kelas
public class DemoJSlider extends JFrame {

   JLabel label = new JLabel("Belajar Java", JLabel.CENTER);
   JSlider sldSize = new JSlider(SwingConstants.VERTICAL, 10, 50, 35);
   JSlider sldRed = new JSlider(0, 250, 0);
   JSlider sldGreen = new JSlider(0, 250, 0);
   JSlider sldBlue = new JSlider(0, 250, 0);
   int sizeValue, redValue, greenValue, blueValue;

   // Konstruktor DemoJSlider
   public DemoJSlider() {

      sizeValue = sldSize.getValue();
      redValue = sldRed.getValue();
      greenValue = sldGreen.getValue();
      blueValue = sldBlue.getValue();

      // Mengatur ukuran dan warna sesuai nilai obyek slider awal
      label.setFont(new Font("Tahoma", Font.PLAIN + Font.BOLD, sizeValue));
      label.setForeground(new Color(redValue, greenValue, blueValue));

      // Mengatur obyek sldSize (JSlider)
      Hashtable<Integer, JLabel> tbl1 = new Hashtable<Integer, JLabel> ();
      tbl1.put(10, new JLabel("10"));
      tbl1.put(20, new JLabel("20"));
      tbl1.put(30, new JLabel("30"));
      tbl1.put(40, new JLabel("40"));
      tbl1.put(50, new JLabel("50"));

      sldSize.setPaintLabels(true);
      sldSize.setLabelTable(tbl1);
      sldSize.setMinorTickSpacing(5);
      sldSize.setMajorTickSpacing(10);
      sldSize.setPaintTicks(true);
      sldSize.setBorder(new TitledBorder("Size"));

      JPanel panelLabel = new JPanel();
      panelLabel.setLayout(new BorderLayout());
      panelLabel.add(label, BorderLayout.CENTER);
      panelLabel.add(sldSize, BorderLayout.LINE_END);
      
      // Mengatur obyek sldRed, sldGreen dan sldBlue (JSlider)
      Hashtable<Integer, JLabel> tbl2 = new Hashtable<Integer, JLabel> ();
      tbl2.put(0, new JLabel("0"));
      tbl2.put(50, new JLabel("50"));
      tbl2.put(100, new JLabel("100"));
      tbl2.put(150, new JLabel("150"));
      tbl2.put(200, new JLabel("200"));
      tbl2.put(250, new JLabel("250"));

      sldRed.setPaintLabels(true);
      sldRed.setLabelTable(tbl2);
      sldRed.setMinorTickSpacing(10);
      sldRed.setMajorTickSpacing(50);
      sldRed.setPaintTicks(true);  

      sldGreen.setPaintLabels(true);
      sldGreen.setLabelTable(tbl2);
      sldGreen.setMinorTickSpacing(10);
      sldGreen.setMajorTickSpacing(50);
      sldGreen.setPaintTicks(true);    

      sldBlue.setPaintLabels(true);
      sldBlue.setLabelTable(tbl2);
      sldBlue.setMinorTickSpacing(10);
      sldBlue.setMajorTickSpacing(50);
      sldBlue.setPaintTicks(true);  

      JPanel panelSliderRGB = new JPanel();
      panelSliderRGB.setLayout(new GridLayout(3, 1, 2, 1)); 
      panelSliderRGB.add(sldRed);
      panelSliderRGB.add(sldGreen);
      panelSliderRGB.add(sldBlue);

      JPanel panelLabelRGB = new JPanel();
      panelLabelRGB.setLayout(new GridLayout(3, 1, 2, 1));
      panelLabelRGB.add(new JLabel("RED"));
      panelLabelRGB.add(new JLabel("GREEN"));
      panelLabelRGB.add(new JLabel("BLUE"));

      JPanel panelRGB = new JPanel();
      panelRGB.setLayout(new BorderLayout(3, 3));
      panelRGB.add(panelLabelRGB, BorderLayout.LINE_START);
      panelRGB.add(panelSliderRGB, BorderLayout.CENTER);
      panelRGB.setBorder(new TitledBorder("RGB Color"));

      getContentPane().setLayout(new BorderLayout(0, 1));
      getContentPane().add(panelLabel, BorderLayout.CENTER);
      getContentPane().add(panelRGB, BorderLayout.PAGE_END);

      // Penanganan event pada obyek slider
      sldSize.addChangeListener(
         new ChangeListener() {
            public void stateChanged(ChangeEvent ce) {
               sizeValue = sldSize.getValue();
               label.setFont(new Font("Tahoma", Font.PLAIN + Font.BOLD, sizeValue));
            }
         }
      );

      sldRed.addChangeListener(
         new ChangeListener() {
            public void stateChanged(ChangeEvent ce) {
               redValue = sldRed.getValue();
               label.setForeground(new Color(redValue, greenValue, blueValue));
            }
         }
      );                     
          
      sldGreen.addChangeListener(
         new ChangeListener() {
            public void stateChanged(ChangeEvent ce) {
               greenValue = sldGreen.getValue();
               label.setForeground(new Color(redValue, greenValue, blueValue));
            }
         }
      ); 

      sldBlue.addChangeListener(
         new ChangeListener() {
            public void stateChanged(ChangeEvent ce) {
               blueValue = sldBlue.getValue();
               label.setForeground(new Color(redValue, greenValue, blueValue));
            }
         }
      ); 
   }

   // Metoda main
   public static void main(String[] args) {
      DemoJSlider frame = new DemoJSlider();
      frame.setTitle("Kelas DemoJSlider");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setSize(415, 330);
      frame.setVisible(true);
   }
}