example9_4.java

200多个自己编的java程序,大家可以学一下.

import java.awt.*;
import java.awt.event.*;

public class Example9_4 extends WindowAdapter implements ActionListener,ItemListener,

KeyListener,MouseListener
{
	
	Frame f;
	Button clearButton,printButton;
	Label  scratchPadLabel,penWidthLabel;
	TextArea scratchPad;
	Choice shapeChoice;
	List colorList;
	Canvas c;
	
	TextArea ct;
	Checkbox filledCheckbox;
	Panel leftPanel;
	Panel rightPanel;
	Panel buttonPanel;
	Panel penWidthPanel;
	Scrollbar penWidthSlider;
	TextField penWidthDisplay;
	int shapeTag=0;
	int colorTag=0;
	int filledTag=1;
	Color MyColor;

	/**
	 * Method main
	 *
	 *
	 * @param args
	 *
	 */
	public static void main(String[] args) {
		// TODO: Add your code here
		
		Example9_4 be=new Example9_4();
		be.go();
	}
	
	
	class MyCanvas extends Canvas
	{
		
		public void paint(Graphics g)
		{
			int npoints=3;
			int [] xpoints={0,50,80};
			int [] ypoints={0,80,50};
			
			if(filledTag==1)
			switch(shapeTag){
				
				case 0:g.fillRect(0,0,96,96);
				break;
				
				case 1:g.fillOval(0,0,96,96);
				break;
				case 2:g.fillPolygon(xpoints,ypoints,npoints);
				break;
				
			}
		else
		switch(shapeTag){
			case 0:g.drawRect(0,0,96,96);
			break;
			case 1:g.drawOval(0,0,96,96);
			break;
			case 2:g.drawPolygon(xpoints,ypoints,npoints);
			break;
			
		}
		}
		
		
	}
	public void go()
	{
		f=new Frame("MyFrame");
		f.setLayout(new FlowLayout());
		f.setSize(600,600);
		
		leftPanel=new Panel();
		leftPanel.setLayout(new FlowLayout());
		rightPanel=new Panel();
		rightPanel.setLayout(new BorderLayout());
		buttonPanel=new Panel();
		buttonPanel.setLayout(new GridLayout(4,1));
		penWidthPanel.setLayout(new BorderLayout());
		colorList=new List(8,false);
		colorList.add("Red");
		colorList.add("Orange");
		colorList.add("Yellow");
		colorList.add("Green");
		colorList.add("Blue");
		colorList.add("Purple");
		colorList.add("Black");
		colorList.add("White");
		colorList.addActionListener(this);
		colorList.addItemListener(this);
		
		leftPanel.add("west",colorList);
		c=new MyCanvas();
		c.setSize(100,100);
		leftPanel.add(c,"Center");
		
		clearButton=new Button("Clear");
	    clearButton.addActionListener(this);
	    printButton=new Button("print");
	    shapeChoice=new Choice();
	    shapeChoice.add("Square");
	    shapeChoice.add("Circle");
	    shapeChoice.add("Triangle");
	    shapeChoice.addItemListener(this);
	    filledCheckbox.addItemListener(this);
	    
	    
	    buttonPanel.add(clearButton);
	    buttonPanel.add(printButton);
	    buttonPanel.add(shapeChoice);
	    buttonPanel.add(filledCheckbox);
	    
	    
	    leftPanel.add("east",buttonPanel);
	    
	    penWidthLabel=new Label("pen width");
	    penWidthSlider=new Scrollbar(Scrollbar.HORIZONTAL,1,1,1,10);
	    penWidthDisplay=new TextField("1",8);
	    
	    
	    
	    penWidthPanel.add("North",penWidthLabel);
	    penWidthPanel.add("Center",penWidthSlider);
	    penWidthPanel.add("East",penWidthDisplay);
	    
	    leftPanel.add("South",penWidthPanel);
	    
	    
	    scratchPadLabel=new Label("Scratch pad");
	    rightPanel.add("North",scratchPadLabel);
	    
	    scratchPad=new TextArea("this is noe a scratch and sniff pad",8,30);
	    rightPanel.add("South",scratchPad);
	    
	    f.add(leftPanel);
	    f.add(rightPanel);
	    f.addWindowListener(this);
	    f.setVisible(true);
	    
		
		
	}

	/**
	 * Method actionPerformed
	 *
	 *
	 */
	public void actionPerformed(ActionEvent e) {
		// TODO: Add your code here
		if(e.getSource()==clearButton)
		{
			System.exit(0);
		}
		
	}
	//implement the ItemListener interface intemStateChanged()
	
	public void itemStateChanged(ItemEvent e)
{
	if(e.getSource()instanceof List)
	{
		colorTag=((List)e.getSource()).getSelectedIndex();
		
	}
	if(e.getSource()instanceof Checkbox)
	{
		if(filledTag==1)
		filledTag=0;
		else filledTag=1;
		
	}	
	if(e.getSource()instanceof Choice)
	{
		shapeTag=((Choice)e.getSource()).getSelectedIndex();
		c.repaint();
		
	}
}

	public void mouseClicked(MouseEvent e){}
	public void mouseEntered(MouseEvent e){}
	public void mouseExited(MouseEvent e){}
	public void mousePressed(MouseEvent e){}
	public void mouseReleased(MouseEvent e){}
	
	public void keyTyped(KeyEvent e){}
	public void keyPressed(KeyEvent e){}
	public void keyReleased(KeyEvent e){}
	
	public void windowClosing(WindowEvent w){
		System.exit(0);
	}
	
	
	
	
	
	
}