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Java File to Byte 본문
import javax.swing.*; import java.awt.GridLayout; import java.awt.event.*; public class CompValidateExample extends JFrame implements ActionListener { JButton b = null; JLabel l = null; public CompValidateExample() { this.setLayout(new GridLayout(1,3)); b = new JButton("Show Label"); b.addActionListener(this); this.add(b); this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.setSize(300, 100); this.setVisible(true); } public void actionPerformed(ActionEvent evt) { if(evt.getSource().equals(b)) { l = new JLabel("It's Label"); this.add(l); this.validate(); } } public static void main(String[] args) { new CompValidateExample(); } }