Component.java 文件源码

/**
 * Gets the background color of this component.
 * @return this component's background color; if this component does
 *          not have a background color,
 *          the background color of its parent is returned
 * @see #setBackground
 * @since JDK1.0
 */
@Transient
public Color getBackground() {
    Color background = this.background;
    if (background != null) {
        return background;
    }
    Container parent = this.parent;
    return (parent != null) ? parent.getBackground() : null;
}