java - how the size of jpanel components in a specific layout can be set? -


I am making a beginning and I want to design a GUI of Windows Calculator in Java. I have set some granutout with some pockets in each I set the size of such buttons: 

  jButton [i] .setPreferredSize (new dimension (42, 42 ));   
 But the differen jpanels buttons do not have the same size. What should I do?  
 
 
  pocket [i] .setPreferredSize (new dimension (42, 42));   
 There are 3 easy ways to maximize the button.  
     
  •  Use a large  sign  for the button  
  •  Use a large  font  for the button ( Preferably through a PLF)  
  •  Set a large margin around text and icons.   
     To set the preferred size, look (yes.)  
     If you still intend to go that route, consult @trashgod and < Em> Override  Choose the preferred size instead

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