GridbagConstraints

[Deepali Pate]

import java.awt.* ;

public class Gridconst extends Frame {
GridBagLayout gridbag=new GridBagLayout();
setLayout(gridbag); //ERROR:Identifier expected.
GridBagConstraints constraints=new GridBagConstraints();
Component b = new Button("Button") ;
add(c) ;
constraints.gridx=5;
constraints.gridy=10;
gridbag.setConstraints(c,constraints);

setSize(300,400) ;

setVisible(true) ;
pack();
}
}
public static void main(String[] args) {
FrameTest frame = new FrameTest() ;

}
}//ERROR:Identifier expected.

Why is this program giving teh error specified?

[manasa teja]

Where is the class FrameTest defined in the code..
what is c in add(c) ???

[Deepali Pate]

Sorry for those errors but even after corrections it gives me error.

import java.awt.* ;

public class Gridconst extends Frame {
GridBagLayout gridbag=new GridBagLayout();
setLayout(gridbag); //ERROR:Identifier expected.

GridBagConstraints constraints=new GridBagConstraints();
Component b = new Button("Button") ;
add(b) ;
constraints.gridx=5;
constraints.gridy=10;
gridbag.setConstraints(c,constraints);

setSize(300,400) ;

setVisible(true) ;
pack();
}
}
public static void main(String[] args) {
Gridconst frame = new Gridconst() ;

}
}

[Amir Ghahrai]

Check out the curly brackets!

[marijana schumann]

...and there should be b and not c in the line

 gridbag.setConstraints(c,constraints); 

[Francisco A Guimaraes]

your problem is that you can�t call a method in the body of the class, you can only declare members. You can call methods inside constructors or other methods like this:

import java.awt.* ;
public class GridConst extends Frame {
GridBagLayout gridbag=new GridBagLayout();
GridBagConstraints constraints=new GridBagConstraints();
public GridConst() {
setLayout(gridbag);
Component b = new Button("Button") ;
add(b) ;
constraints.gridx=5;
constraints.gridy=10;
gridbag.setConstraints(b,constraints);
setSize(300,400) ;
setVisible(true) ;
pack();
}

public static void main(String[] args) {
GridConst frame = new GridConst() ;
}
}

You should try reading some good books on Java like "Thinking in Java" from Bruce Eckel, to avoid this problems in the future.
Francisco

[Alan Chong]

Strange!I've seen code similar to this in JQplus:

public class 
{
  int x = method();
  ....
  public int method()
  {
     return 10;
  }
  .....
  .....
}

And it works.

[Deepali Pate]

Hi Francisco,
Yes it worked. May be that was teh problem. But it is not displying the size i am specifying.
Also if i add other constraints like
constraints.gridwidth=15;
constraints.gridheight=10;
constraints.weightx=35;
constraints.weighty=30;
i see no change Why??? Can u pls explain.
Thnx a lot

[Siddhartha Bhattacharya]

public class a
{ int x = method(); ....
public int method()
{
return 10;
}
..... .....
}
I think a smart compiler will make the above code look like ..
public class a
{ int x ;
public a()
{
x = method();
super();
}
public int method()
{
return 10;
}
..... .....
}