Mine

class Segment extends Box{        JProgressBar progress;        JLabel label1,label2,label3;        JButton button;        public Segment(){                createVerticalBox();                progress = new JProgressBar();                label1 = new JLabel();                label2 = new JLabel();                label3 = new JLabel();                button = new JButton();                Box hbox1 = Box.createHorizontalBox();                hbox1.add(progress);                hbox1.add(button);                Box hbox2 = Box.createHorizontalBox();                hbox2.add(label2);                hbox2.add(label3);                this.add(label1);                this.add(hbox1);                this.add(hbox2);        }} javac Segment.java Segment.java:9: cannot find symbolsymbol  : constructor Box()location: class javax.swing.Box        public Segment(){                        ^1 error