3>Methods inherited from class&nbsp;javax.swing.<a href="https://docs.oracle.com/javase/8/docs/api/javax/swing/JFrame.html?is-external=true" title="class or interface in javax.swing">JFrame</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/javax/swing/JFrame.html?is-external=true#addImpl-java.awt.Component-java.lang.Object-int-" title="class or interface in javax.swing">addImpl</a>, <a href="https://docs.oracle.com/javase/8/docs/api/javax/swing/JFrame.html?is-external=true#createRootPane--" 