java - Adding Jpanel containing JButton disturbs the structure of frame -

class frame extends jframe{  public frame() {     jframe jf= new jframe("student admission");     jf.setlayout(new gridlayout(5,1));     jpanel jpn= new jpanel();       jpanel enr= new jpanel();     enr.setlayout(new flowlayout(flowlayout.left));     jlabel enrno= new jlabel("enrollment number",jlabel.left);     jtextfield enrnoinput=new jtextfield(3);     enr.add(enrno);     enr.add(enrnoinput);     jf.add(enr);       jlabel name= new jlabel("student's name",jlabel.left);     jtextfield nameinput=new jtextfield(60);     jpn.add(name);     jpn.add(nameinput);     jf.add(jpn);      jpanel jpfn= new jpanel();     jlabel fname= new jlabel("fathers's name",jlabel.left);     jtextfield fnameinput=new jtextfield(60);     jpfn.add(fname);     jpfn.add(fnameinput);     jf.add(jpfn);       jpanel hscp= new jpanel();     hscp.setlayout(new flowlayout(flowlayout.left));     jlabel hscper= new jlabel("hsc percentage",jlabel.left);     jtextfield hscperinput=new jtextfield(3);     hscp.add(hscper);     hscp.add(hscperinput);     jf.add(hscp);       jpanel sscp= new jpanel();     sscp.setlayout(new flowlayout(flowlayout.left));     jlabel sscper= new jlabel("ssc percentage",jlabel.left);     jtextfield sscperinput=new jtextfield(3);     sscp.add(sscper);     sscp.add(sscperinput);     jf.add(sscp);      //after adding panel frame's structure disturbed     jpanel buttonpanel= new jpanel();     jbutton save= new jbutton("save");     jbutton cancel= new jbutton("cancel");     buttonpanel.add(save);     buttonpanel.add(cancel);     jf.add(buttonpanel);       jf.setresizable(false);     jf.pack();     jf.setvisible(true);     jf.setdefaultcloseoperation(exit_on_close); } }  

before adding buttonpanel

after adding buttonpanel

i want add button panel in middle-bottom of frame how can that?

your grid layout accounts 5 components, it's screwing when use 6. add buttonpanel sscp panel , add sscp panel overall frame.

jpanel sscp= new jpanel(); sscp.setlayout(new flowlayout(flowlayout.left)); jlabel sscper= new jlabel("ssc percentage",jlabel.left); jtextfield sscperinput=new jtextfield(3); sscp.add(sscper); sscp.add(sscperinput);  jpanel buttonpanel= new jpanel(); jbutton save= new jbutton("save"); jbutton cancel= new jbutton("cancel"); buttonpanel.add(save); buttonpanel.add(cancel); //change here sscp.add(buttonpanel); jf.add(sscp);