JDK Image

1. 引用构造函数

public final class Image {

  public static final int BLACK = 0xFF000000;
  public static final int WHITE = 0xFFFFFFFF;
  
  private final int onColor;
  private final int offColor;

  public Image() {
    this(BLACK, WHITE);
  }

  public Image(int onColor, int offColor) {
    this.onColor = onColor;
    this.offColor = offColor;
  }
}