swing - Java GroupLayout Exception - 


public class grouplayout implements runnable {  public static void main(string[] args) {     swingutilities.invokelater(new grouplayout()); }  @override public void run() {     jframe jframe = new jframe();     grouplayout layout = new grouplayout(jframe.getcontentpane());     jframe.getcontentpane().setlayout(layout);     layout.setautocreategaps(true);     layout.setautocreatecontainergaps(true);      jlabel jlabel1 = new jlabel("a");     jlabel jlabel2 = new jlabel("b");     jlabel jlabel3 = new jlabel("c");     jlabel jlabel4 = new jlabel("d");      layout.setverticalgroup(         layout.createsequentialgroup()             .addgroup(layout.createparallelgroup(grouplayout.alignment.baseline)                 .addcomponent(jlabel1)                 .addcomponent(jlabel2))             .addgroup(layout.createparallelgroup(grouplayout.alignment.baseline)                 .addcomponent(jlabel3)                 .addcomponent(jlabel4)));      jframe.pack();     jframe.setvisible(true); } }

i'm trying run i've got following exception:

exception in thread "awt-eventqueue-0" java.lang.illegalstateexception: javax.swing.jlabel[,0,0,0x0,invalid,alignmentx=0.0,alignmenty=0.0,border=,flags=8388608,maximumsize=,minimumsize=,preferredsize=,defaulticon=,disabledicon=,horizontalalignment=leading,horizontaltextposition=trailing,icontextgap=4,labelfor=,text=a,verticalalignment=center,verticaltextposition=center] not attached horizontal group

what's problem? how can fix it?

you have specify both horizontal , vertical layout, see grouplayout giving error java swing

i suggest use tool build gui.


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