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Код

import java.awt.Dimension;
import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JFrame;


public class DemoClickableButtons extends JFrame{
    
    private static final int N_BUTTONS = 35;
    
    private static final Dimension SMALL_BUTTON = new Dimension(70, 30), BIG_BUTTON = new Dimension(120, 50);
    
    private JButton[] buttons;
    
    public DemoClickableButtons(){    
        super();
        
        //Form-related steps
        
        this.setLayout(new FlowLayout());
        this.setSize(900, 200);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        //Create buttons
        
        buttons = new JButton[N_BUTTONS];
        
        for(int i = 0; i < N_BUTTONS; i++){
            
            //Create button
            
            buttons[i] = new JButton("Button " + i);
            
            //Create and add action listener
            
            buttons[i].addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    
                    //Change size of the buttons if a button is clicked
                    
                    for(JButton but : buttons){
                        if(but == (JButton)evt.getSource()){
                            but.setSize(BIG_BUTTON);
                        } else {
                            but.setSize(SMALL_BUTTON);
                        }
                    }
                    
                }
            });
            
            //Add buttons to the form
            
            this.add(buttons[i]);

            
        }
        
        //Show the form
        
        this.setVisible(true);
    }
    
    


    public static void main(String[] args) {
        new DemoClickableButtons();
    }

}