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New GroupLayout(Container host)

import javax.swing.GroupLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class Main {   public static void main(String[] args) {     JFrame frame = new JFrame();     JPanel panel = new JPanel();     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     GroupLayout layout = new GroupLayout(panel);     panel.setLayout(layout);     JButton buttonD = new JButton("D");     JButton buttonR = new JButton("R");     JButton buttonY = new JButton("Y");     JButton buttonO = new JButton("O");     JButton buttonT = new JButton("T");     GroupLayout.SequentialGroup leftToRight = layout.createSequentialGroup();     leftToRight.addComponent(buttonD);     GroupLayout.ParallelGroup columnMiddle = layout.createParallelGroup();     columnMiddle.addComponent(buttonR);     columnMiddle.addComponent(buttonO);     columnMiddle.addComponent(buttonT);     leftToRight.addGroup(columnMiddle);     leftToRight.addComponent(buttonY);     GroupLayout.SequentialGroup topToBottom = layout.createSequentialGroup();     GroupLayout.ParallelGroup rowTop = layout.createParallelGroup();     rowTop.addComponent(buttonD);     rowTop.addComponent(buttonR);     rowTop.addComponent(buttonY);     topToBottom.addGroup(rowTop);     topToBottom.addComponent(buttonO);     topToBottom.addComponent(buttonT);     layout.setHorizontalGroup(leftToRight);     layout.setVerticalGroup(topToBottom);     frame.add(panel);     frame.pack();     frame.setVisible(true);   } }