Create JButton Array Example

import javax.swing.*;
import java.awt.*; // layout


public class JButtonArrayExample extends JFrame{
  
  private JButton btn[] = new JButton[20];
  
  public JButtonArrayExample(){
    
    for (int i=0; i <btn.length;i++){
      btn[i] = new JButton("Button "+ i);
      getContentPane().add(btn[i]);
    }     
     getContentPane().setLayout(new FlowLayout());
     
  }
  
  public static void main(String[] args) {
    JButtonArrayExample e = new JButtonArrayExample();
    e.setSize(300,300);
    e.setVisible(true);
  } //end main
  
}//end class