Script Java

11.4 Stack
public NumCheckbox(int n, boolean state, CheckboxGroup group) {
super(String.valueOf(n),state,group);
num = n;
}
}
public int getNum() {return num;}
public class Drawing extends Frame {
public Drawing() {
setTitle("Drawing");
setBounds(400,0,400,500);
setVisible(true);
}
}
public void paint(Graphics g) {logo.run(g);}
private void place(Component comp,int x,int y,int width,int height) {
comp.setBounds(x, y, width, height);
add(comp);
}
public UserFrame() {
setTitle("Editor");
setLayout(null);
setBounds(0,0,400,515);
setResizable(false);
commands = new CheckboxGroup();
arguments = new CheckboxGroup();
place(text = new TextArea(),30,80,340,340);
text.setBackground(Color.white);
place(button = new Button("CLEAR"),30,450,60,20);
button.setBackground(Color.white);
button.addActionListener(this);
place(new Checkbox("FD",true,commands),120,440,40,15);
place(new Checkbox("BK",false,commands),120,455,40,15);
place(new Checkbox("RT",false,commands),120,470,40,15);
place(new Checkbox("LT",false,commands),120,485,40,15);
place(new NumCheckbox(5,true,arguments),170,440,40,15);
place(new NumCheckbox(30,false,arguments),170,455,40,15);
place(new NumCheckbox(50,false,arguments),170,470,40,15);
place(new NumCheckbox(90,false,arguments),170,485,40,15);
place(button = new Button("DO"),240,450,60,20);
button.setBackground(Color.white);
button.addActionListener(this);
place(button = new Button("UNDO"),310,450,60,20);
button.setBackground(Color.white);
button.addActionListener(this);
logo = new Logo();
drawing = new Drawing();
setVisible(true);
}
public void actionPerformed(ActionEvent event) {
if (event.getActionCommand().equals("CLEAR")) {
logo.clear();
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