如果是继承awt中的Panel，将drawString()写在paint中，重载update方法： public void update(Graphics g) { paint(g); } 可防止闪烁。如果是JPanel就不必。因为Panel中update方法是先擦后画，有闪烁。而JPanel中用双缓冲画。
// Properties /** * Paints this component using the given graphics context. * This is a standard Java AWT method which typically gets called * by the AWT to handle painting this component. It paints this component * using the given graphics context. The graphics context clipping region * is set to the bounding rectangle of this component and its [0,0] * coordinate is this component's top-left corner. * * @param g the graphics context used for painting * @see java.awt.Component#repaint * @see java.awt.Component#update */ public void paint(Graphics g) { Dimension dim = size(); if (image != null) { int imageWidth = image.getWidth(this); int imageHeight = image.getHeight(this); switch(imageStyle) { default: case IMAGE_TILED: { //Calculate number of images that should be drawn horizontally int numHImages = dim.width / imageWidth; //Don't forget remainders if (dim.width % imageWidth != 0) numHImages++; //Calculate number of images that should be drawn vertically int numVImages = dim.height / imageHeight; //Don't forget remainders if (dim.height % imageHeight != 0) numVImages++; int h; int v = 0; for (int vCount = 0;vCount < numVImages;vCount++) { h = 0; for (int hCount = 0;hCount < numHImages;hCount++) { g.drawImage(image, h, v, imageWidth, imageHeight, this); //Increment to next column h += imageWidth; } //Increment to next row v += imageHeight; } break; } case IMAGE_CENTERED: { g.drawImage (image, (dim.width - imageWidth) / 2, (dim.height - imageHeight) / 2, imageWidth, imageHeight, this); break; } case IMAGE_SCALED_TO_FIT: { g.drawImage(image, 0, 0, dim.width, dim.height, this); break; } case IMAGE_NORMAL: { g.drawImage(image, 0, 0, this); break; } }//switch } else { g.clearRect(0, 0, dim.width, dim.height); } super.paint(g); }
public void init(){
repaint();
}
不过你的情况是不用调用repaint的
public void update(Graphics g) {
paint(g);
}
可防止闪烁。如果是JPanel就不必。因为Panel中update方法是先擦后画，有闪烁。而JPanel中用双缓冲画。