#javac CheckboxTest.java
#java CheckboxTest
 Warning: Cannot convert string "MetaCtrl<Key>Insert" to type VirtualBinding
Exception in thread "main" java.lang.NullPointerException
	at java.awt.Container.addImpl(Container.java:584)
	at java.awt.Container.add(Container.java:490)
	at CheckboxTest.<init>(CheckboxTest.java:17)
	at CheckboxTest.main(CheckboxTest.java:25)
    import java.awt.*;
import java.awt.event.*;
import java.applet.*;
 public class CheckboxTest extends Frame
{
	Panel p;
	Checkbox cb1,cb2;
	TextArea ta;
 	public CheckboxTest()
	{
		setLayout(new BorderLayout());
		ta = new TextArea();
		cb1 = new Checkbox("berry");
		cb2 = new Checkbox("apple");
		add(p,BorderLayout.NORTH);
		add(ta,BorderLayout.CENTER);
		p.add(cb1);
		p.add(cb2);
	}
 	public static void main(String args<>)
	{
		CheckboxTest cbt = new CheckboxTest();
		cbt.setSize(300,300);
		cbt.show();
	}
}--이 곳에 서명을 적어주십시오.
그 날이 오면 ...