java - How to Set Multiple Components Visible on a JFrame? -

when add more 1 component on jframe , component added last displayed , rest not displayed , issue visibility ?

import java.awt.graphicsenvironment; import java.awt.point; import java.awt.*; import javax.swing.jframe; import javax.swing.jbutton; import javax.swing.jlabel; public class centeringawindow { public static void main(string[] args) {  jframe awindow = new jframe("this window title");  point center = graphicsenvironment.getlocalgraphicsenvironment().getcenterpoint();  int windowwidth = 400;  int windowheight = 150;  jbutton item1=new jbutton("hiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii");  jbutton item2=new jbutton("how ?");  awindow.add(item1);  awindow.add(item2);  jlabel label1=new jlabel("label 1");  awindow.add(label1);  jlabel label2=new jlabel("label 2");  awindow.add(label2);  //center align jframe  awindow.setlocationrelativeto(null);  awindow.setdefaultcloseoperation(jframe.exit_on_close);  awindow.setvisible(true); // display window 

} }

you need set layoutmanager appropriate needs.