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Ich dachte, ich habe meinen Hauptcode in diesem Programm hinzugefügt, aber es nicht erkannt. Vermisse ich es? Ich erhalte den Fehler paint.Paintbrush-Klasse wurde nicht im PaintBrush-Projekt gefunden. Ich bin mir nicht sicher, wo ich die Hauptklasse am Anfang aufnehmen kann, ohne dass ein Fehler zurückgegeben wird. Vielen Dank für Ihren Rat oder Ihre Hilfe.Hauptklasse nicht gefunden Java-Programm
package PaintBrush;
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
/**
*
* @author Olive
*/
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
public class Paintbrush extends Applet implements MouseListener,
MouseMotionListener,
ActionListener
{
// component declarations
Button blackButton;
Button redButton;
Button greenButton;
Button blueButton;
Button penButton;
Button lineButton;
Button eraserButton;
Button clearButton;
Button squareButton;
Button ovalButton;
Button fillSquareButton;
Button fillOvalButton;
Label colourTitle;
Label colourDisplay;
Label toolTitle;
Label toolDisplay;
// required variables to store settings
Color currentColour;
int toolType;
// variables to store interim coordinates
int oldX = -1;
int oldY = -1;
public void init()
{
// create all the buttons
blackButton = new Button("Black");
redButton = new Button("Red");
greenButton = new Button("Green");
blueButton = new Button("Blue");
penButton = new Button("Pen");
lineButton = new Button("Line");
eraserButton = new Button("Eraser");
clearButton = new Button("Clear");
squareButton = new Button("Square");
ovalButton = new Button("Oval");
fillSquareButton = new Button("F Square");
fillOvalButton = new Button("F Oval");
// add action listners for all the buttons
blackButton.addActionListener(this);
redButton.addActionListener(this);
greenButton.addActionListener(this);
blueButton.addActionListener(this);
penButton.addActionListener(this);
lineButton.addActionListener(this);
eraserButton.addActionListener(this);
clearButton.addActionListener(this);
squareButton.addActionListener(this);
ovalButton.addActionListener(this);
fillSquareButton.addActionListener(this);
fillOvalButton.addActionListener(this);
// create the button bar panel
Panel buttonPanel = new Panel();
buttonPanel.setLayout(new GridLayout(6, 2));
buttonPanel.add(blackButton);
buttonPanel.add(redButton);
buttonPanel.add(greenButton);
buttonPanel.add(blueButton);
buttonPanel.add(penButton);
buttonPanel.add(lineButton);
buttonPanel.add(eraserButton);
buttonPanel.add(clearButton);
buttonPanel.add(squareButton);
buttonPanel.add(ovalButton);
buttonPanel.add(fillSquareButton);
buttonPanel.add(fillOvalButton);
// create the status bar panel
colourTitle = new Label("Colour: ");
currentColour = Color.black;
colourDisplay = new Label("Black");
toolTitle = new Label(" Selected Tool: ");
toolType = 0;
toolDisplay = new Label("Pen (Scribble)");
Panel statusPanel = new Panel();
statusPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
statusPanel.add(colourTitle);
statusPanel.add(colourDisplay);
statusPanel.add(toolTitle);
statusPanel.add(toolDisplay);
// arrange final panels in a border layout
this.setLayout(new BorderLayout());
this.add(buttonPanel, BorderLayout.WEST);
this.add(statusPanel, BorderLayout.NORTH);
// add mouse listners to applet
this.addMouseListener(this);
this.addMouseMotionListener(this);
}
// event handling for when an action occurs (in this case, whenever
// a button is pressed)
public void actionPerformed(ActionEvent e)
{
// get the local graphics page to draw on
Graphics page = this.getGraphics();
// red button pressed: set the current colour to red
// and update the status display
if (e.getSource().equals(redButton))
{
currentColour = Color.red;
colourDisplay.setText("Red");
}
// blue button pressed: set the current colour to blue
// and update the status display
if (e.getSource().equals(blueButton))
{
currentColour = Color.blue;
colourDisplay.setText("Blue");
}
// green button pressed: set the current colour to green
// and update the status display
if (e.getSource().equals(greenButton))
{
currentColour = Color.green;
colourDisplay.setText("Green");
}
// black button pressed: set the current colour to black
// and update the status display
if (e.getSource().equals(blackButton))
{
currentColour = Color.black;
colourDisplay.setText("Black");
}
// pen button pressed: set the selected tool to '0'
// and update the status display
if (e.getSource().equals(penButton))
{
toolType = 0;
toolDisplay.setText("Pen (Scribble)");
}
// eraser button pressed: set the selected tool to '1'
// and update the status display
if (e.getSource().equals(eraserButton))
{
toolType = 1;
toolDisplay.setText("Eraser");
}
// square button pressed: set the selected tool to '2'
// and update the status display
if (e.getSource().equals(squareButton))
{
toolType = 2;
toolDisplay.setText("Square");
}
// oval button pressed: set the selected tool to '3'
// and update the status display
if (e.getSource().equals(ovalButton))
{
toolType = 3;
toolDisplay.setText("Oval");
}
// filled square button pressed: set the selected tool to '4'
// and update the status display
if (e.getSource().equals(fillSquareButton))
{
toolType = 4;
toolDisplay.setText("Filled Square");
}
// filled oval button pressed: set the selected tool to '5'
// and update the status display
if (e.getSource().equals(fillOvalButton))
{
toolType = 5;
toolDisplay.setText("Filled Oval");
}
// clear button pressed: get the size of the applet and draw
// a clearing rectangle over it, to clear the screen
if (e.getSource().equals(clearButton))
{
Dimension size = this.getSize();
page.clearRect(0, 0, size.width, size.height);
}
// line button pressed: set the selected tool to '6'
// and update the status display
if (e.getSource().equals(lineButton))
{
toolType = 6;
toolDisplay.setText("Line");
}
}
// event handling for when the mouse button is first pressed
public void mousePressed(MouseEvent e)
{
// store the coordinates for future reference
oldX = e.getX();
oldY = e.getY();
}
// event handling for when the mouse is dragged with the button
// held down
public void mouseDragged(MouseEvent e)
{
Graphics page = this.getGraphics();
// scribble tool: draw a line from the old coordinates to the
// new ones
if (toolType == 0)
{
page.setColor(currentColour);
page.drawLine(oldX, oldY, e.getX(), e.getY());
oldX = e.getX();
oldY = e.getY();
}
// eraser tool: clear a small rectangles' worth at the specified
// coordinate
if (toolType == 1)
{
page.clearRect(e.getX(), e.getY(), 10, 10);
page.setColor(currentColour);
}
}
// resolve method: used to swap two numbers around so the
// smaller is always in element 0, and the larger in element
// 1, of the returned array
public int[] resolve(int newC, int oldC)
{
int start, end;
if (newC < oldC)
{
start = newC;
end = oldC;
}
else
{
start = oldC;
end = newC;
}
int[] blah = {start, end};
return blah;
}
// event handling for when the mouse button is released
public void mouseReleased(MouseEvent e)
{
// get the applet's Graphics page
Graphics page = this.getGraphics();
// resolve the coordinates so that the smaller of the x and y
// coordinates can be picked out easily
int newX = e.getX();
int newY = e.getY();
int[] x = resolve(newX, oldX);
int[] y = resolve(newY, oldY);
// tool type 2: draw a rectangle
if (toolType == 2)
{
page.setColor(currentColour);
page.drawRect(x[0], y[0], (x[1] - x[0]), (y[1] - y[0]));
}
// tool type 3: draw an oval
if (toolType == 3)
{
page.setColor(currentColour);
page.drawOval(x[0], y[0], (x[1] - x[0]), (y[1] - y[0]));
}
// tool type 4: draw a filled rectangle
if (toolType == 4)
{
page.setColor(currentColour);
page.fillRect(x[0], y[0], (x[1] - x[0]), (y[1] - y[0]));
}
// tool type 5: draw a filled oval
if (toolType == 5)
{
page.setColor(currentColour);
page.fillOval(x[0], y[0], (x[1] - x[0]), (y[1] - y[0]));
}
// tool type 6: draw the line
if (toolType == 6)
{
page.setColor(currentColour);
page.drawLine(oldX, oldY, newX, newY);
}
}
// unused methods from listener interfaces
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseMoved(MouseEvent e) {}
public void mouseClicked(MouseEvent e) {}
}