GridBagLayout - petla

 private void initialize() {
		frame = new JFrame();
		frame.setBounds(100, 100, 450, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		GridBagLayout gridBagLayout = new GridBagLayout();
		gridBagLayout.columnWidths = new int[]{0, 0, 0, 0, 0, 0, 0, 0};
		gridBagLayout.rowHeights = new int[]{0, 0, 0, 0, 0};
		gridBagLayout.columnWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
		gridBagLayout.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
		frame.getContentPane().setLayout(gridBagLayout);
		
		JLabel lblKamil = new JLabel("Kamil");
		GridBagConstraints gbc_lblKamil = new GridBagConstraints();
		gbc_lblKamil.insets = new Insets(0, 0, 5, 5);
		gbc_lblKamil.gridx = 3;
		gbc_lblKamil.gridy = 0;
		frame.getContentPane().add(lblKamil, gbc_lblKamil);
		
		
		JButton btnField [][] = null;
		GridBagConstraints gbcBtnField [][] = null;
		for(int i = 1 ; i<=3;i++){
			for(int j = 1 ; j<=3 ; j++){
				btnField[i][j] = new JButton("Button");
				gbcBtnField[i][j] = new GridBagConstraints();
				gbcBtnField[i][j].gridx = i;
				gbcBtnField[i][j].gridy = j;
				frame.getContentPane().add(btnField[i][j],gbcBtnField[i][j]);
				
			}
			
		}

 
JButton  [][]btnField = new JButton[3][3];
		GridBagConstraints gbcBtnField [][] = new GridBagConstraints[3][3];
		for(int i = 0 ; i<3;i++){
			for(int j = 0 ; j<3 ; j++){
				btnField[i][j] = new JButton("Button" +i+j);
				gbcBtnField[i][j] = new GridBagConstraints();
				gbcBtnField[i][j].gridx = i;
				gbcBtnField[i][j].gridy = j+1;
				frame.getContentPane().add(btnField[i][j],gbcBtnField[i][j]);
				
			}
			

private void initialize() {
		frame = new JFrame();
		frame.setBounds(100, 100, 450, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		GridBagLayout gridBagLayout = new GridBagLayout();
		gridBagLayout.columnWidths = new int[]{0, 0, 0, 0, 0, 0, 0, 0};
		gridBagLayout.rowHeights = new int[]{0, 0, 0, 0, 0};
		gridBagLayout.columnWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
		gridBagLayout.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
		frame.getContentPane().setLayout(gridBagLayout);
		Dimension sizeFrame = new Dimension(100,300);
		//frame.setPreferredSize(sizeFrame);
		JLabel lblKamil = new JLabel("Kamil");
		GridBagConstraints gbc_lblKamil = new GridBagConstraints();
		gbc_lblKamil.insets = new Insets(0, 0, 5, 5);
		gbc_lblKamil.gridx = 3;
		gbc_lblKamil.gridy = 0;
		
		frame.getContentPane().add(lblKamil, gbc_lblKamil);
		
		
		JButton  [][]btnField = new JButton[10][10];
		GridBagConstraints gbcBtnField [][] = new GridBagConstraints[10][10];
		for(int i = 0 ; i<10;i++){
			for(int j = 0 ; j<10 ; j++){
				btnField[i][j] = new JButton("Button" +i+j);
				Dimension preferredSize = new Dimension(50,50);
				btnField[i][j].setPreferredSize(preferredSize);
				gbcBtnField[i][j] = new GridBagConstraints();
				gbcBtnField[i][j].gridx = i;
				gbcBtnField[i][j].gridy = j+1;
				frame.getContentPane().add(btnField[i][j],gbcBtnField[i][j]);
				frame.pack();
			}
			
		}
	
	} 

frame.serResizable(false);

frame.setLayout(new GridBagLayout());

gridBagLayout.columnWidths = new int[]{0, 0, 0, 0, 0, 0, 0, 0};
gridBagLayout.rowHeights = new int[]{0, 0, 0, 0, 0};
gridBagLayout.columnWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
gridBagLayout.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};

frame.setLayout(new GridBagLayout()); 

frame.getContentPane().setLayout(gridBagLayout);