swing - java Calculator Text Field -

i have create simple calculate exercise. there should 4 buttons , text field display. here code 4 buttons:

import java.awt.*; import java.awt.event.*; import javax.swing.*;  class jframeexample {    jbutton btn1 = new jbutton("1");   jbutton btn2 = new jbutton("2");   jbutton btn3 = new jbutton("+");   jbutton btn4 = new jbutton("=");    public void calculator(){     jframe frame = new jframe("simple java calculator");     frame.setsize(320,320);     frame.setdefaultcloseoperation(jframe.exit_on_close);     frame.setresizable(false);     frame.setvisible(true);      jpanel headpanel = new jpanel();     jpanel numberpanel = new jpanel();     jpanel labelpanel = new jpanel();      numberpanel.add(btn1);       numberpanel.add(btn2);     numberpanel.add(btn3);     numberpanel.add(btn4);      numberpanel.setlayout(new gridlayout(2,2));     frame.add(numberpanel,borderlayout.center);   }    public static void main(string[] args) {     jframeexample jf = new jframeexample();     jf.calculator();   } } 

my problem have no idea on how insert text field. tried methods internet no result. can guys give me solution? how should that? @ least link tutorial how it.

you need jtextfield. can set , text content calling settext() , gettext().

i go for:

jpanel (borderlayout)    |    +-- jpanel (gridlayout), borderlayout.south    |    |    |    + buttons    |    +-- jtextfield, borderlayout.north