java - How to create a scrollbar for my JTextArea using JScrollPane? -

the program compiles properly, scroll pane text area not created. don't know why happening. defined jscrollpane , implemented scrollpane = new jscrollpane

this code:

import java.awt.*; import javax.swing.*; import java.awt.event.*; import javax.swing.table.*; public class guiproject5 extends jframe { private static final int width = 400; private static final int height = 300; private jpanel lowerpanel; private jlabel widthl, areal; private jtextarea areata; private jtextarea ta; private jscrollpane scrollpane; private jtextfield lengthtf; private jcheckbox gergsc; private jbutton exitb;  //button handlers: private exitbuttonhandler ebhandler;  public guiproject5() {      areal = new jlabel("label: ", swingconstants.right);      lengthtf = new jtextfield("textfield");      lowerpanel = new jpanel();      areata = new jtextarea("textarea", 6, 8);      ta = new jtextarea("stuff", 6, 8);      scrollpane = new jscrollpane();      gergsc = new jcheckbox("checkbox");      //specify handlers each button , add (register)     actionlisteners each button.      exitb = new jbutton("button");     ebhandler = new exitbuttonhandler();     exitb.addactionlistener(ebhandler);      settitle("my gui in java");     container pane = getcontentpane();     pane.setlayout(new gridlayout(4, 2));      //add things pane in order want them appear (left right, top bottom)      pane.add(exitb);     pane.add(lengthtf);     pane.add(lowerpanel);     ta = new jtextarea("stuff", 6, 8);     ta.setlinewrap(true);     ta.setwrapstyleword(true);     lowerpanel.add(new jscrollpane(scrollpane));     pane.add(new jscrolscrollpane);     pane.add(gergsc);     pane.add(areal);        setsize(width, height);     setvisible(true);     setdefaultcloseoperation(exit_on_close); }   public class exitbuttonhandler implements actionlistener {     public void actionperformed(actionevent e)     {         system.exit(0);     } }  public static void main(string[] args) {     guiproject5 rectobj = new guiproject5(); } 

}

you should initialize jscrollpane like

jsp=new jscrollpane(textareaobj); 

and add panel.

jscrollpane 

is container class. should define component on want scrollbars in jscrollpane() constructor , add jsp object in layout