请大家帮忙看看，我的按钮为什么这么大，可不可以让按钮小一点？谢谢！
import javax.swing.*;
import java.awt.*;
import java.awt.color.*;
public class text12 {
    public static void main(String args[])
    {
        JFrame f=new JFrame("窗口3");
        f.setSize(650,650);
        JPanel p1=new JPanel();
        p1.setSize(800,150);
        f.getContentPane().add(p1);
        p1.setBackground(Color.red);
        p1.setLayout(new FlowLayout(FlowLayout.CENTER));
        p1.add(new TextField(100));
        JPanel p2=new JPanel();
        
        //p2.setSize(10,10);
        p2.add(new Button("1"));
        p2.add(new Button("2"));
        p2.add(new Button("3"));
        p2.add(new Button("C"));
        p2.add(new Button("4"));
        p2.add(new Button("5"));
        p2.add(new Button("6"));
        p2.add(new Button("E"));
        p2.add(new Button("7"));
        p2.add(new Button("8"));
        p2.add(new Button("9"));
        p2.add(new Button("L"));
        p2.add(new Button("0"));
        p2.add(new Button("K"));
        p2.add(new Button("A"));
        p2.add(new Button("I"));
        f.getContentPane().add(p2);
        p2.setLayout(new GridLayout(4,4));
        
        f.setVisible(true);
    }
}