It doesn't like 'super' where ever I put it.

Hello, below is my program stripped to bare bones. Java says 'super'
must be first statement in constructor. I've moved it everywhere still
no luck. The program was running yesterday and I can't figure what
could be wrong. Any suggestions?

The error output is listed below the program

TIA Bill S.

PROGRAM:

import javax.swing.*;
import java.awt.*;
import java.util.*;

public class CalcFrame1 extends JFrame{

     public void CalcFrame1() {
     super("CalcFrame1");
     //setTitle("CalcFrame1");
     FlowLayout flo = new FlowLayout();
     setLayout(flo);
     setLookAndFeel();
     //setSize(600,600);

    JButton shf = new JButton("shft");
    JButton chs = new JButton("chs");
    add (shf);
    add (chs);

    pack();
    setVisible(true);
     }
private void setLookAndFeel(){
         try{
         UIManager.setLookAndFeel(
                 "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
            }
         catch(Exception exc){
         // ignore error
             }
    }

    public static void main(String[] args){
        CalcFrame1 ClFr1 = new CalcFrame1();
    }
}

ERROR OUTPUT:
java.lang.VerifyError: Constructor must call super() or this() before
return in method CalcFrame1.<init>()V at offset 0
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2442)
    at java.lang.Class.getMethod0(Class.java:2685)
    at java.lang.Class.getMethod(Class.java:1620)
    at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:492)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:484)
Exception in thread "main" Java Result: 1
BUILD SUCCESSFUL (total time: 2 seconds)