This is what I have :
and this is what I want to have :
Here's a piece of my code
container.add(conteneur2 , BorderLayout.EAST);
conteneur2.setBackground(Color.ORANGE);
conteneur2.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
JButton Bouton= new JButton("New remote site");
// Bouton 1
gbc.gridx=0;
gbc.gridy=0;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.gridheight = 1;
gbc.anchor = GridBagConstraints.LINE_START;
conteneur2.add(bouton,gbc);
So what's the problem?
You need to set the anchor NORTH
gbc.anchor = GridBagConstraints.NORTH;
and the y weight to 1 means all the free space is distributed in y direction.
gbc.weighty = 1;