2021-04-25 자바 NullcontainerEx

package GUI;
import javax.swing.*;
import java.awt.*;


public class NullcontainerEx extends JFrame {
	public NullcontainerEx() {
		setTitle("Null Container Sample");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		Container  c = getContentPane();
		c.setLayout(null);
		
		JLabel la = new JLabel("Hello, Press Buttons");
		la.setLocation(130,50);
		la.setSize(200,20);
		c.add(la);
		
		for (int i =1; i<=9; i++) {
			JButton b = new JButton(Integer.toString(i));
			b.setLocation(i*15, i*15);
			b.setSize(50,20);
			c.add(b);
			
			
		}
		setSize(300,200);
		setVisible(true);
		
		
	}

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