Java, interface design (please master weapon)

Importjavax.swing.*; Public classMyFrameextendsjframe{piublic myframe () { This. Settitle ("This is my first window");  This. SetSize (300,300);  This. setresizable (false);  This. setvisible (true);} Public Static voidMain (String args[]) {myframe frame1=NewMyFrame (); }}

Importjava.awt.*; Public classContenpanedemoextendsjframe{ PublicContentpanedemo () {Super("I like the first star Leslie"); Container ContentPane= This. Getcontentpane ();//What is the function of this code contentpane.setbackground (Color.cyan);  This. SetSize (300,300);  This. setresizable (false);  This. setvisible (true); Public Static voidMain (String args[]) {Contentpanedemo lesile=NewContentpanedemo (); }}   

Java, interface design (please master weapon)