kivahan.java

来自「jbshortcourse」· Java 代码 · 共 41 行

import java.awt.*;

public class KivaHan extends Canvas {

  private String msg;
  private int width, height;

  public KivaHan () {
    this ("Coffee: 10 lira");
  }
  public KivaHan (String s) {
    this (s, 200, 200);
  }
  public KivaHan (String s, int width, int height) {
    msg = s;
    this.width = width;
    this.height = height;
    setForeground (SystemColor.controlText);
    setFont (new Font ("Serif", Font.ITALIC, 24));
    setSize (getPreferredSize());
  }
  public void paint (Graphics g) {
    Dimension d = getSize();
    FontMetrics fm = g.getFontMetrics();
    int len = fm.stringWidth (msg);
    int x = Math.max (((d.width - len) / 2), 0);
    int y = d.height / 2;
    g.drawString (msg, x, y);
  }
  public void setMessage (String s) {
    msg = s;
    repaint();
  }
  public String getMessage () {
    return msg;
  }
  public Dimension getPreferredSize () {
    return new Dimension (width, height);
  }
}