java - Swing program to display JButton -


i write swing code display 3 text fields , labels , 1 button, button displays @ top frame. want move bottom of 3 text fields. here code:

import javax.swing.*; import java.awt.*;  class textfield  {     public static void main(string[] args)      {         jframe jf;         jlabel rcno,name,amount;         jtextfield rc_no,na_me,am_t;         jbutton ok;         jpanel p1,p2;          jf=new jframe("billing");          rcno=new jlabel("recipt no:   ");         rc_no=new jtextfield(6);         name=new jlabel("student name:   ");         na_me=new jtextfield(20);         amount=new jlabel("amount:   ");         am_t=new jtextfield(5);         ok=new jbutton("ok");          p1=new jpanel();         //p1.setlayout(new flowlayout());         p1.setlayout(new gridlayout(3,2,5,5));          p1.add(rcno);         p1.add(rc_no);         p1.add(name);         p1.add(na_me);         p1.add(amount);         p1.add(am_t);          p2=new jpanel();         p2.setlayout(new flowlayout(flowlayout.right));         //ok.setpreferredsize(new dimension(50,20));         p2.add(ok);          p1.setbounds(110,100,200,100);          //p2.setbounds(220,220,10,10);          jf.add(p1);         jf.add(p2);          jf.setsize(400,500);         jf.setvisible(true);         jf.setdefaultcloseoperation(jframe.exit_on_close);     } }

some notes on example:

  • don't use setxxxsize() or setbounds(); let layout work.

  • for p1, consider gridbaglayout, shown here, or grouplayout, shown here.

  • the default layout of jframe borderlayout; add p2 south.

  • swing gui objects should constructed , manipulated only on event dispatch thread.

image

import javax.swing.*; import java.awt.*;  class formtest {      public static void main(string[] args) {         eventqueue.invokelater(new formtest()::display);     }      private void display() {         jframe jf = new jframe("billing");          jbutton ok = new jbutton("ok");         jlabel rcno = new jlabel("recipt no:", jlabel.right);         jtextfield rc_no = new jtextfield(12);         jlabel name = new jlabel("student name:", jlabel.right);         jtextfield na_me = new jtextfield(12);         jlabel amount = new jlabel("amount:", jlabel.right);         jtextfield am_t = new jtextfield(12);          jpanel p1 = new jpanel();         p1.setlayout(new gridlayout(0, 2, 5, 5));         p1.setborder(borderfactory.createemptyborder(5, 5, 5, 5));         p1.add(rcno);         p1.add(rc_no);         p1.add(name);         p1.add(na_me);         p1.add(amount);         p1.add(am_t);          jpanel p2 = new jpanel();         p2.setlayout(new flowlayout(flowlayout.right));         p2.add(ok);          jf.add(p1);         jf.add(p2, borderlayout.south);         jf.pack();         jf.setvisible(true);         jf.setdefaultcloseoperation(jframe.exit_on_close);     } }

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