JTextArea 加入滚动条

JTextArea texA;
JScrollPane scroll;

TextEdit(String name){
super(name);
init();
}

void init(){
this.setBounds(100,100,600,400);
JPanel pan = new JPanel();
pan.setLayout(new FlowLayout(FlowLayout.CENTER));
pan.setBackground(Color.YELLOW);

texA = new JTextArea("34reterte35",20,30);
scroll = new JScrollPane(texA);
pan.add(scroll);
this.add(pan);
}