java - jLabel.setVisible(true) doesn't work -
public class game extends javax.swing.jframe { arraylist<integer> numere = new arraylist<>(); arraylist<bila> balls = new arraylist<bila>(); arraylist<string> culori = new arraylist<>(); arraylist<jlabel> colours = new arraylist<>(); random random = new random(); jframe frame = new jframe("display image"); jpanel panel = (jpanel)frame.getcontentpane(); int nrballs=0; public void createcolours(){ for(int i=0;i<7;i++){ culori.add("portocaliu"); culori.add("rosu"); culori.add("albastru"); culori.add("verde"); culori.add("negru"); culori.add("galben"); culori.add("violet"); } } public void createnumbers(){ for(int i=1;i<50;i++){ numere.add(i); } } public void createballs(){ while(nrballs<36){ int indx =random.nextint(numere.size()); int nr = numere.get(indx); numere.remove(indx); string culoare = culori.get(indx); culori.remove(indx); balls.add(new bila(culoare,nr)); nrballs++; } private void jbutton1mouseclicked(java.awt.event.mouseevent evt) { for(int i=0;i<35;i++){ if(balls.get(i).culoare.equals("portocaliu")){ jlabel2.setvisible(true); } } } public static void main(string args[]) { game game = new game(); game.createcolours(); game.createnumbers(); game.createballs(); game.afisare(); } } public class bila { int nr; string culoare; bila(string culoare,int nr){ this.nr = nr; this.culoare = culoare; } when click button want find in array first ball respective colour , jlabel appear. indexoutofboundsexception index:0 size:0. know causing this? array list not empty, made method print out elements in array , it's not empty. stack trace:
exception in thread "awt-eventqueue-0" java.lang.indexoutofboundsexception: index: 0, size: 0 @ java.util.arraylist.rangecheck(arraylist.java:653) @ java.util.arraylist.get(arraylist.java:429) @ turbo6.game.jbutton1mouseclicked(game.java:154) @ turbo6.game.access$100(game.java:15) @ turbo6.game$2.mouseclicked(game.java:101) @ java.awt.awteventmulticaster.mouseclicked(awteventmulticaster.java:270) @ java.awt.component.processmouseevent(component.java:6538) @ javax.swing.jcomponent.processmouseevent(jcomponent.java:3324) @ java.awt.component.processevent(component.java:6300) @ java.awt.container.processevent(container.java:2236) @ java.awt.component.dispatcheventimpl(component.java:4891) @ java.awt.container.dispatcheventimpl(container.java:2294) @ java.awt.component.dispatchevent(component.java:4713) @ java.awt.lightweightdispatcher.retargetmouseevent(container.java:4888) @ java.awt.lightweightdispatcher.processmouseevent(container.java:4534) @ java.awt.lightweightdispatcher.dispatchevent(container.java:4466) @ java.awt.container.dispatcheventimpl(container.java:2280) @ java.awt.window.dispatcheventimpl(window.java:2750) @ java.awt.component.dispatchevent(component.java:4713) @ java.awt.eventqueue.dispatcheventimpl(eventqueue.java:758) @ java.awt.eventqueue.access$500(eventqueue.java:97) @ java.awt.eventqueue$3.run(eventqueue.java:709) @ java.awt.eventqueue$3.run(eventqueue.java:703) @ java.security.accesscontroller.doprivileged(native method) @ java.security.protectiondomain$javasecurityaccessimpl.dointersectionprivilege(protectiondomain.java:76) @ java.security.protectiondomain$javasecurityaccessimpl.dointersectionprivilege(protectiondomain.java:86) @ java.awt.eventqueue$4.run(eventqueue.java:731) @ java.awt.eventqueue$4.run(eventqueue.java:729) @ java.security.accesscontroller.doprivileged(native method) @ java.security.protectiondomain$javasecurityaccessimpl.dointersectionprivilege(protectiondomain.java:76) @ java.awt.eventqueue.dispatchevent(eventqueue.java:728) @ java.awt.eventdispatchthread.pumponeeventforfilters(eventdispatchthread.java:201) @ java.awt.eventdispatchthread.pumpeventsforfilter(eventdispatchthread.java:116) @ java.awt.eventdispatchthread.pumpeventsforhierarchy(eventdispatchthread.java:105) @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:101) @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:93) @ java.awt.eventdispatchthread.run(eventdispatchthread.java:82)
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