JTabbedPane.java 文件源码

/**
 * Returns the currently selected component for this tabbedpane.
 * Returns <code>null</code> if there is no currently selected tab.
 *
 * @return the component corresponding to the selected tab
 * @see #setSelectedComponent
 */
@Transient
public Component getSelectedComponent() {
    int index = getSelectedIndex();
    if (index == -1) {
        return null;
    }
    return getComponentAt(index);
}