Java how to start up the GUI made with IntelliJ IDEA -

i have made simple gui using intellij-idea , can't figure out how start up. form1 f = new form(); inside main() function doesn't seem anything. know how start ?

public class main {      public static void main(string[] args) {         system.out.println("hello world!");         form1 t = new form1();     } } 

i had add couple of lines more expected. here how working code looks form1.java file. didn't change main() fucntion.

public class form1 extends jframe {      // ******** these auto-generated ide ********     private jpanel panel1;     private jbutton button1;     private jbutton bb137;     private jbutton button3;     private jbutton button4;     private jbutton button5;     private jbutton button6;     private jbutton button7;     private jcheckbox checkbox1;     private jradiobutton radiobutton1;     private jradiobutton radiobutton2;     private jradiobutton radiobutton3;     // ************************************************************      public form1(){         super("whatever form title here.");         // panel1 main panel can see in question's screenshot         setcontentpane(panel1);                 //x , y, width, height         setbounds(300,300,600,600);         setdefaultcloseoperation(jframe.exit_on_close);         setvisible(true);     } }