Thread: JFrame, frame's title doesnt appear.

import SwingGUI_Applications.JSliderSample2;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JButton;
import javax.swing.Action;
import javax.swing.AbstractAction;
import javax.swing.SwingConstants;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
 
import java.awt.Color;
import java.awt.Label;
import java.awt.Point;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.event.ActionEvent;
 
/**
 * Simple property Window.
 * 
 * @author  JSoft
 */
 
public class PropertiesWindow extends JFrame implements ChangeListener {
 
    JFrame propertiesWindow;
 
    JButton btn1;
    JButton btn2;
    JButton btn3;
    JButton btn4;
    JButton btn5;
    JButton setUp;
 
    JSlider widthSlider;
    JSlider heightSlider;
    JSlider pointXSlider;
    JSlider pointYSlider;
 
    JSlider redSchemeSlider;
    JSlider blueSchemeSlider;
    JSlider greenSchemeSlider;
 
    JLabel widthLabel;
    JLabel heightLabel;
    JLabel pointYLabel;
    JLabel pointXLabel;
 
    JLabel redSchemeLabel;
    JLabel blueSchemeLabel;
    JLabel greenSchemeLabel;
 
    JPanel windowPanel;
 
    // the spot where the sliders color combination will be displayed
    Label colorSpot;
 
    // the color spot label name
    Label spotLabel;
 
    // center point for the shape
    Point centerPoint;
 
    // dimension of the shape
    Dimension shapeDimension;
 
 
    // minimum value for the width of the shape
    private static final int WIDTH_MIN_VALUE = 100;
 
    // maximum value for width of the shape
    private static final int WIDTH_MAX_VALUE = 500;
 
    // minimum value for the height of the shape
    private static final int HEIGHT_MIN_VALUE = 100;
 
    // maximum value for the height of the shape
    private static final int HEIGHT_MAX_VALUE = 500;
 
    // minimum value for the center point (point x) of the shape
    private static final int MIN_POINT_X = 200;
 
    // maximum value for the center point (point x) of the shape
    private static final int MAX_POINT_X = 800;
 
    // minimum value for the center point (point y) of the shape
    private static final int MIN_POINT_Y = 100;
 
    // maximum value for the center point (point  y) of the shape
    private static final int MAX_POINT_Y = 500;
 
    // constant value for color scheme slider's minor tick
    private static final int COLOR_SLIDER_MINOR_TICK = 5;
 
    // constant value for color scheme slider's major tick
    private static final int COLOR_SLIDER_MAJOR_TICK = 10;
 
    // constant value of minor tick for the geometric pattern sliders
    private static final int MINOR_TICK = 10;
 
    // constant value of major tick for the geometric pattern sliders
    private static final int MAJOR_TICK = 100;
 
    public void showPropertyWindow() {
 
        propertiesWindow = new JFrame("Screensaver Properties Window");
 
        windowPanel = new JPanel();
        /**
         * this label will be the testing spot for the combination of colors
         * produced by color scheme sliders
         */
 
 
        widthSlider = new JSlider(WIDTH_MIN_VALUE, WIDTH_MAX_VALUE);
        heightSlider = new JSlider(HEIGHT_MIN_VALUE, HEIGHT_MAX_VALUE);
        pointXSlider = new JSlider(MIN_POINT_X, MAX_POINT_X);
        pointYSlider = new JSlider(MIN_POINT_Y, MAX_POINT_Y);
 
        // sliders for the adjustment of the color
        redSchemeSlider = new JSlider(SwingConstants.VERTICAL, 0 , 255, 0);
        blueSchemeSlider = new JSlider(SwingConstants.VERTICAL, 0, 255, 0);
        greenSchemeSlider = new JSlider(SwingConstants.VERTICAL, 0 ,255, 0);
 
        widthLabel = new JLabel();
        heightLabel = new JLabel();
        pointXLabel = new JLabel();
        pointYLabel = new JLabel();
 
        // Label for each color
        redSchemeLabel = new JLabel();
        blueSchemeLabel = new JLabel();
        greenSchemeLabel = new JLabel();
 
        // spot where the color that will be generated by the color sliders is displayed
        colorSpot = new Label();
 
        // Label for the width value slider
        widthLabel.setText("Width  :  ");
        widthLabel.setBounds(20, 10, 50, 40);
 
        // set the slider properties for the width
        widthSlider.setBounds(20, 35, 250, 50);
        widthSlider.setMinorTickSpacing(MINOR_TICK);
        widthSlider.setMajorTickSpacing(MAJOR_TICK);
        widthSlider.setPaintTicks(true);
        widthSlider.setPaintLabels(true);
        widthSlider.setToolTipText("Width");
        widthSlider.setForeground(Color.GRAY);
        widthSlider.addChangeListener(this);
 
        // Label for the height value slider
        heightLabel.setText("Height  :  ");
        heightLabel.setBounds(20, 90, 60, 70);
 
        // set the slider properties for the height
        heightSlider.setBounds(20, 135, 250, 45);
        heightSlider.setMinorTickSpacing(MINOR_TICK);
        heightSlider.setMajorTickSpacing(MAJOR_TICK);
        heightSlider.setPaintTicks(true);
        heightSlider.setPaintLabels(true);
        heightSlider.setToolTipText("Height");
        heightSlider.setForeground(Color.GRAY);
 
        // Label for the point x (center point)
        pointXLabel.setText("Point x  :  ");
        pointXLabel.setBounds(20, 175, 70, 100);
 
        // set the properties of the point x(center point) slider
        pointXSlider.setBounds(20, 230, 250, 50);
        pointXSlider.setMinorTickSpacing(MINOR_TICK);
        pointXSlider.setMajorTickSpacing(MAJOR_TICK);
        pointXSlider.setPaintTicks(true);
        pointXSlider.setPaintLabels(true);
        pointXSlider.setToolTipText("Center Point (x)");
        pointXSlider.setForeground(Color.GRAY);
 
        // Label for the point y (center point)
        pointYLabel.setText("Point y  :  ");
        pointYLabel.setBounds(20, 240, 70, 155);
 
        // set the properties of the point y(center point) slider
        pointYSlider.setBounds(20, 330, 250, 45);
        pointYSlider.setMinorTickSpacing(MINOR_TICK);
        pointYSlider.setMajorTickSpacing(MAJOR_TICK);
        pointYSlider.setPaintTicks(true);
        pointYSlider.setPaintLabels(true);
        pointYSlider.setToolTipText("Center Point (y)");
        pointYSlider.setForeground(Color.GRAY);
 
        // Label for each of the color scheme slider
        redSchemeLabel.setText("Red  :  ");
        redSchemeLabel.setBounds(300, 5, 50 , 50);
        greenSchemeLabel.setText("Green  :  ");
        greenSchemeLabel.setBounds(530, 5, 50, 50);
        blueSchemeLabel.setText("Blue  :  ");
        blueSchemeLabel.setBounds(420, 5, 50, 50);
 
        // set the properties of the red color scheme slider
        redSchemeSlider.setBounds(310, 40, 50, 280);
        redSchemeSlider.setMinorTickSpacing(COLOR_SLIDER_MINOR_TICK);
        redSchemeSlider.setMajorTickSpacing(COLOR_SLIDER_MAJOR_TICK);
        redSchemeSlider.setPaintTicks(true);
        redSchemeSlider.setPaintLabels(false);
        redSchemeSlider.setToolTipText("Red");
        redSchemeSlider.setForeground(Color.RED);
        redSchemeSlider.addChangeListener(this);
 
        // set the properties of the green color scheme slider
        greenSchemeSlider.setBounds(550, 40, 50, 280);
        greenSchemeSlider.setMinorTickSpacing(COLOR_SLIDER_MINOR_TICK);
        greenSchemeSlider.setMajorTickSpacing(COLOR_SLIDER_MAJOR_TICK);
        greenSchemeSlider.setPaintTicks(true);
        greenSchemeSlider.setPaintLabels(false);
        greenSchemeSlider.setToolTipText("Green");
        greenSchemeSlider.setForeground(Color.GREEN);
        greenSchemeSlider.addChangeListener(this);
 
        // set the properties of the blue color shceme slider
        blueSchemeSlider.setBounds(430, 40, 50, 280);
        blueSchemeSlider.setMinorTickSpacing(COLOR_SLIDER_MINOR_TICK);
        blueSchemeSlider.setMajorTickSpacing(COLOR_SLIDER_MAJOR_TICK);
        blueSchemeSlider.setPaintTicks(true);
        blueSchemeSlider.setPaintLabels(false);
        blueSchemeSlider.setToolTipText("Blue");
        blueSchemeSlider.setForeground(Color.blue);
        blueSchemeSlider.addChangeListener(this);
 
        // set the color spot in the panel
        colorSpot.setText("Shape's Color.");
        colorSpot.setFont(new Font("Monospaced",Font.CENTER_BASELINE ,20));
        colorSpot.setBounds(320, 350, 260, 40);
        colorSpot.setAlignment(Label.CENTER);
        colorSpot.setForeground(new Color(255, 255, 255));
        colorSpot.setBackground(new Color(0, 0, 0));
 
 
 
        Action properties = new AbstractAction() {
 
            public void actionPerformed(ActionEvent e) {
 
 
            }
        };
 
        // show the labels
        windowPanel.add(widthLabel);
 
        windowPanel.add(heightLabel);
 
        windowPanel.add(pointXLabel);
 
        windowPanel.add(pointYLabel);
 
        windowPanel.add(redSchemeLabel);
 
        windowPanel.add(blueSchemeLabel);
 
        windowPanel.add(greenSchemeLabel);
 
 
        // show the sliders
        windowPanel.add(widthSlider);
        windowPanel.add(heightSlider);
        windowPanel.add(pointXSlider);
        windowPanel.add(pointYSlider);
        windowPanel.add(redSchemeSlider);
        windowPanel.add(blueSchemeSlider);
        windowPanel.add(greenSchemeSlider);
        windowPanel.add(colorSpot);
 
        windowPanel.setLayout(null);
        windowPanel.setDoubleBuffered(false);
 
        propertiesWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        propertiesWindow.setSize(700, 450);
        propertiesWindow.setLocation(350, 200);
        propertiesWindow.setVisible(true);
        propertiesWindow.getContentPane().add(windowPanel);
    }
 
    public static void main(String[] args) {
 
        JSliderSample2 enhc = new JSliderSample2();
 
        enhc.showPropertyWindow();
    }
 
    public void stateChanged(ChangeEvent event) {
 
            int width = widthSlider.getValue();
            int height = heightSlider.getValue();
            int pointX = pointXSlider.getValue();
            int pointY = pointYSlider.getValue();
            int red = redSchemeSlider.getValue();
            int green = greenSchemeSlider.getValue();
            int blue = blueSchemeSlider.getValue();
 
            if ((red >= 200) && (red <= 255)) {
 
                if ((green >= 200) && (green <= 255))  {
 
                    if ((blue >= 200) && (green <= 255)) {
 
                        colorSpot.setForeground(Color.BLACK);
                    }
                }
            }
            else if ((red <= 50) && (red >= 0)) {
 
                if ((green <= 50) && (green >= 0)) {
 
                    if ((blue <= 50) && (blue >= 0)) {
 
                        colorSpot.setForeground(Color.WHITE);
                    }
                }
            }
 
            // set the spot color according to the colors generated by sliders
            colorSpot.setBackground(new Color(red, green, blue));
    }
}

why does this title - "Screensaver Properties Window" doesnt appear on the JFrame window?

No idea why the title isn't showing, but you should make the call to add to the content pane prior to making the JFrame visible. Perhaps you can make another call to setTitle, but this shouldn't be necessary.