面板中的居中字符串

在Java标准库中？不，您可以随时做一些事情

private void drawStringMiddleOfPanel(String string, Graphics g) { String message2 = string; int stringWidth = 0; int stringAccent = 0; int xCoordinate = 0; int yCoordinate = 0; // get the FontMetrics for the current font FontMetrics fm = g.getFontMetrics();          // find the center location to display stringWidth = fm.stringWidth(message2); stringAccent = fm.getAscent(); // get the position of the leftmost character in the baseline xCoordinate = getWidth() / 2 - stringWidth / 2; yCoordinate = getHeight() / 2 + stringAccent / 2; // draw String g.drawString(message2, xCoordinate, yCoordinate); currentMessage = message2;  // alternate message        }

用

public void paintComponent(Graphics g) {        super.paintComponent(g);        if (currentMessage.equals(message1)) { removeAll(); drawStringMiddleOfPanel(message1, g);        } }