keytester.java

介绍有关java的资料 课件 相当一本书籍 里面都是很基础的知识

		import java.applet.*;
		import java.awt.*;
		public class KeyTester extends Applet {
			boolean	m_bGotFocus = false;
			Event m_evtList[];
			public void init() {
				resize(400,300);
				m_evtList = new Event[10];
			}
			public void paint(Graphics g) {
				Font font;
				g.setColor( Color.lightGray );
				g.draw3DRect(1,1,size().width-4,size().height-4,true);
				g.setColor( Color.black );
				if( !m_bGotFocus ) {
					font = new Font("TimesRoman", Font.BOLD, 20);
					g.setFont(font);
					g.drawString("鼠标点击此处开始键盘测试",70,150);
					return;
				}
				font = new Font("TimesRoman", Font.BOLD,12);
				g.setFont(font);
				g.drawString("键", 20, 50);
				g.drawString("事件", 70, 50);
				g.drawString("组合功能键", 120, 50);
				g.drawString("键值", 210, 50);
				g.drawString("事件值", 250, 50);
				g.drawString("组合功能键值", 310, 50);
				for( int i = 0; i < m_evtList.length; i++ ) {
					if( m_evtList[i] != null )
						showEvent( g, m_evtList[i], 80+(i*20) );
				}
			}
			public void showEvent( Graphics g, Event evt, int row ) {
				Font font = new Font("TimesRoman", Font.PLAIN, 12);
				String outputStr = "";
				char ch;
				g.setFont(font);
				if( evt.key == 32 )
					outputStr = "<space>";
				else
					if( evt.key > 32 && evt.key < 127 )
						outputStr = ""+(char)evt.key;
					else
						if(evt.key >= evt.HOME && evt.key <= evt.F12)
							outputStr = getFunctionKeyString( evt.key );
						else
							outputStr = "<n/a>";
				g.drawString(outputStr, 20, row);
				if( evt.id == evt.KEY_PRESS || evt.id == evt.KEY_ACTION )
					outputStr = "KeyDown";
				else
					if( evt.id == evt.KEY_RELEASE
									|| evt.id == evt.KEY_ACTION_RELEASE )
						outputStr = "KeyUp";
					else
						outputStr = "";
				g.drawString(outputStr, 70, row);
				outputStr = "";
				if( evt.controlDown() )
					outputStr += "CTRL ";
				if( evt.shiftDown() )
					outputStr += "SHIFT ";
				if( evt.metaDown() )
					outputStr += "META ";
				if( (evt.modifiers & Event.ALT_MASK) != 0 )
					outputStr += "ALT ";
				g.drawString(outputStr, 140, row);
				outputStr = ""+evt.key;
				g.drawString(outputStr, 210, row);
				outputStr = ""+evt.id;
				g.drawString(outputStr, 260, row);
				outputStr = ""+evt.modifiers;
				g.drawString(outputStr, 340, row);
			}
			public String getFunctionKeyString(int key) {
				String keyStrings[] =
						{"HOME","END","PGUP","PGDN","UP","DOWN",
							"LEFT","RIGHT","F1","F2","F3","F4","F5",
							"F6","F7","F8","F9","F10","F11","F12"};
				int	keyOffset = key - Event.HOME;
				if( keyOffset < 0 || keyOffset >= keyStrings.length )
					return "<n/a>";
				return keyStrings[(key-Event.HOME)];
			}
			public boolean gotFocus(Event evt, Object arg) {
					m_bGotFocus = true;
					repaint();
				return true;
			}
			public boolean lostFocus(Event evt, Object arg) {
				m_bGotFocus = false;
				repaint();
				return true;
			}
			public boolean keyDown(Event evt, int key) {
				addEvent( evt );
				return true;
			}
			public boolean keyUp(Event evt, int key) {
				addEvent( evt );
				return true;
			}
			public void addEvent(Event evt) {
				for( int i = (m_evtList.length-1); i > 0; i-- )
					m_evtList[i] = m_evtList[i-1];
				m_evtList[0] = evt;
				repaint();
			}
		}