Re: It doesn't like 'super' where ever I put it.
On 6/10/2012 7:02 AM, Jim Janney wrote:
bilsch<bilsch01@gmail.com> writes:
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)
Try changing
public void CalcFrame1() {
to
public CalcFrame1() {
OK. Thanks. Can you tell me why that makes a difference?
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