CS代考 package src;

package src;

import java.awt.BorderLayout;
import java.awt.Color;

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import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class HelloWorld extends JComponent implements Runnable, ChangeListener {
* HelloWorld – a simple hello world example, with a swing slider control.
* Originally created by Creath 2019
* Updated by 2022

static final int gap = 30;

JFrame jframe;
JSlider jslider;

public HelloWorld() {
SwingUtilities.invokeLater(this);

public static void main(String[] args) {
new HelloWorld();

public Dimension getPreferredSize() {
return new Dimension(640, 480);

public void run() {

// Boiler plate to get the program up and running.
jframe = new JFrame(“Hello World”);
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// set up the slider
jslider = new JSlider();
jslider.setMaximum(100);
jslider.setMinimum(0);
jslider.addChangeListener(this);

// make the main panel
JPanel mainpanel = new JPanel();
mainpanel.setLayout(new BorderLayout());
mainpanel.add(this, BorderLayout.CENTER);
mainpanel.add(jslider, BorderLayout.PAGE_END);

// add panel to jframe and make viewable
jframe.getContentPane().add(mainpanel);
jframe.setVisible(true);
jframe.pack();

public void stateChanged(ChangeEvent e) {
repaint();

protected void paintComponent(Graphics g) {
* A very simple demo of the graphics class.
* Modify this method (and others if needed) such that “Hello World” is drawn in the
* center of the panel. The slider is used to set the font size of the
* “Hello World” text, and the text should range from a font size of 10 to 150.
* If the “Hello World” does not fit within the rectangle (which is 30 pixels in set),
* then fill the image with a red color and do not draw the text or rectangle.

int value = jslider.getValue();

super.paintComponent(g);
Dimension dim = this.getSize();
// fill the background
g.setColor(Color.white);
g.fillRect(0, 0, dim.width, dim.height);

// draw the border
g.setColor(Color.BLACK);
g.drawRect(gap, gap, dim.width – 2*gap, dim.height – 2*gap);

// draw a line
// remove this and replace it with the required solution.
g.drawLine(gap, dim.height/2, gap + value * (dim.width-2*gap) / 100, dim.height/2);

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