效果圖如下：

import java.awt.*; import java.awt.event.*; import java.awt.image.BufferedImage; import java.awt.geom.Line2D; import java.awt.geom.Rectangle2D; import java.util.Date; import javax.swing.*; import javax.swing.border.EtchedBorder; import javax.swing.border.TitledBorder;public class MemoryMonitorextends JPanel {static JCheckBox dateStampCB = new JCheckBox("Output Date Stamp");public Surface surf;JPanel controls;boolean doControls;JTextField tf;public MemoryMonitor(){setLayout(new BorderLayout());setBorder(new TitledBorder(new EtchedBorder(), "Memory Monitor"));add(surf = new Surface());controls = new JPanel();controls.setPreferredSize(new Dimension(135, 80));Font font = new Font("serif", Font.PLAIN, 10);JLabel label = new JLabel("Sample Rate");label.setFont(font);label.setForeground(Color.black);controls.add(label);tf = new JTextField("1000");tf.setPreferredSize(new Dimension(45, 20));controls.add(tf);controls.add(label = new JLabel("ms"));label.setFont(font);label.setForeground(Color.black);controls.add(dateStampCB);dateStampCB.setFont(font);addMouseListener(new MouseAdapter(){public void mouseClicked(MouseEvent e){removeAll();if ( (doControls = !doControls)){surf.stop();add(controls);}else{try{surf.sleepAmount = Long.parseLong(tf.getText().trim());}catch (Exception ex){}surf.start();add(surf);}validate();repaint();}});}public class Surfaceextends JPanel implements Runnable{public Thread thread;public long sleepAmount = 1000;private int w, h;private BufferedImage bimg;private Graphics2D big;private Font font = new Font("Times New Roman", Font.PLAIN, 11);private Runtime r = Runtime.getRuntime();private int columnInc;private int pts[];private int ptNum;private int ascent, descent;private float freeMemory, totalMemory;private Rectangle graphOutlineRect = new Rectangle();private Rectangle2D mfRect = new Rectangle2D.Float();private Rectangle2D muRect = new Rectangle2D.Float();private Line2D graphLine = new Line2D.Float();private Color graphColor = new Color(46, 139, 87);private Color mfColor = new Color(0, 100, 0);private String usedStr;public Surface(){setBackground(Color.black);addMouseListener(new MouseAdapter(){public void mouseClicked(MouseEvent e){if (thread == null){start();}else{stop();}}});}public Dimension getMinimumSize(){return getPreferredSize();}public Dimension getMaximumSize(){return getPreferredSize();}public Dimension getPreferredSize(){return new Dimension(135, 80);}public void paint(Graphics g){if (big == null){return;}big.setBackground(getBackground());big.clearRect(0, 0, w, h);float freeMemory = (float) r.freeMemory();float totalMemory = (float) r.totalMemory();// .. Draw allocated and used strings ..big.setColor(Color.green);big.drawString(String.valueOf( (int) totalMemory / 1024) +"K allocated", 4.0f, (float) ascent + 0.5f);usedStr = String.valueOf( ( (int) (totalMemory - freeMemory)) /1024)+ "K used";big.drawString(usedStr, 4, h - descent);// Calculate remaining sizefloat ssH = ascent + descent;float remainingHeight = (float) (h - (ssH * 2) - 0.5f);float blockHeight = remainingHeight / 10;float blockWidth = 20.0f;float remainingWidth = (float) (w - blockWidth - 10);// .. Memory Free ..big.setColor(mfColor);int MemUsage = (int) ( (freeMemory / totalMemory) * 10);int i = 0;for (; i < MemUsage; i++){mfRect.setRect(5, (float) ssH + i * blockHeight,blockWidth, (float) blockHeight - 1);big.fill(mfRect);}// .. Memory Used ..big.setColor(Color.green);for (; i < 10; i++){muRect.setRect(5, (float) ssH + i * blockHeight,blockWidth, (float) blockHeight - 1);big.fill(muRect);}// .. Draw History Graph ..big.setColor(graphColor);int graphX = 30;int graphY = (int) ssH;int graphW = w - graphX - 5;int graphH = (int) remainingHeight;graphOutlineRect.setRect(graphX, graphY, graphW, graphH);big.draw(graphOutlineRect);int graphRow = graphH / 10;// .. Draw row ..for (int j = graphY; j <= graphH + graphY; j += graphRow){graphLine.setLine(graphX, j, graphX + graphW, j);big.draw(graphLine);}// .. Draw animated column movement ..int graphColumn = graphW / 15;if (columnInc == 0){columnInc = graphColumn;}for (int j = graphX + columnInc; j < graphW + graphX;j += graphColumn){graphLine.setLine(j, graphY, j, graphY + graphH);big.draw(graphLine);}--columnInc;if (pts == null){pts = new int[graphW];ptNum = 0;}else if (pts.length != graphW){int tmp[] = null;if (ptNum < graphW){tmp = new int[ptNum];System.arraycopy(pts, 0, tmp, 0, tmp.length);}else{tmp = new int[graphW];System.arraycopy(pts, pts.length - tmp.length, tmp, 0,tmp.length);ptNum = tmp.length - 2;}pts = new int[graphW];System.arraycopy(tmp, 0, pts, 0, tmp.length);}else{big.setColor(Color.yellow);pts[ptNum] = (int) (graphY + graphH * (freeMemory / totalMemory));for (int j = graphX + graphW - ptNum, k = 0; k < ptNum; k++, j++){if (k != 0){if (pts[k] != pts[k - 1]){big.drawLine(j - 1, pts[k - 1], j, pts[k]);}else{big.fillRect(j, pts[k], 1, 1);}}}if (ptNum + 2 == pts.length){// throw out oldest pointfor (int j = 1; j < ptNum; j++){pts[j - 1] = pts[j];}--ptNum;}else{ptNum++;}}g.drawImage(bimg, 0, 0, this);}public void start(){thread = new Thread(this);thread.setPriority(Thread.MIN_PRIORITY);thread.setName("MemoryMonitor");thread.start();}public synchronized void stop(){thread = null;notify();}public void run(){Thread me = Thread.currentThread();while (thread == me && !isShowing() || getSize().width == 0){try{thread.sleep(500);}catch (InterruptedException e){return;}}while (thread == me && isShowing()){Dimension d = getSize();if (d.width != w || d.height != h){w = d.width;h = d.height;bimg = (BufferedImage) createImage(w, h);big = bimg.createGraphics();big.setFont(font);FontMetrics fm = big.getFontMetrics(font);ascent = (int) fm.getAscent();descent = (int) fm.getDescent();}repaint();try{thread.sleep(sleepAmount);}catch (InterruptedException e){break;}if (MemoryMonitor.dateStampCB.isSelected()){System.out.println(new Date().toString() + " " + usedStr);}}thread = null;}}public static void main(String s[]){final MemoryMonitor demo = new MemoryMonitor();WindowListener l = new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}public void windowDeiconified(WindowEvent e){demo.surf.start();}public void windowIconified(WindowEvent e){demo.surf.stop();}};JFrame f = new JFrame("MemoryMonitor");f.addWindowListener(l);f.getContentPane().add("Center", demo);f.pack();f.setSize(new Dimension(200, 200));f.setVisible(true);demo.surf.start();} }

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