java - How to use a button to call a method from another class? -


i'm pretty new java, i'm trying make basic ui. can use jbuttons call joptionpanes easily, can't use them call class.

currently have main class, ui class, , class handles data.

in class handles data have method performs basic sum on 2 elements of array:

    public void firstmonth(){         string ans;         int num1 = integer.parseint(sorteddata[0][0][0]);         int num2 = integer.parseint(sorteddata[0][0][1]);         int sum = num1 * num2;          ans=string.format("the sum of day1 , day2 is: %s", sum);         joptionpane.showmessagedialog(null, ans, "title", joptionpane.plain_message);      }

then in ui class try , call when 1 of buttons pressed:

public class userinterface extends jframe {  getdata = new getdata();      private class myhandler implements actionlistener{          public void actionperformed(actionevent event){              if(event.getsource()==button1){                 a.firstmonth();              } } }

but when press button more exceptions can bear count. ideas?

sorry if basic question.

edit, here exceptions when click button:

exception in thread "awt-eventqueue-0" java.lang.numberformatexception: null     @ java.lang.integer.parseint(integer.java:454)     @ java.lang.integer.parseint(integer.java:527)     @ pkg110_term3.getdata.firstmonth(getdata.java:75)     @ pkg110_term3.userinterface$myhandler.actionperformed(userinterface.java:71)     @ javax.swing.abstractbutton.fireactionperformed(abstractbutton.java:2018)     @ javax.swing.abstractbutton$handler.actionperformed(abstractbutton.java:2341)     @ javax.swing.defaultbuttonmodel.fireactionperformed(defaultbuttonmodel.java:402)     @ javax.swing.defaultbuttonmodel.setpressed(defaultbuttonmodel.java:259)     @ javax.swing.plaf.basic.basicbuttonlistener.mousereleased(basicbuttonlistener.java:252)     @ java.awt.component.processmouseevent(component.java:6505)     @ javax.swing.jcomponent.processmouseevent(jcomponent.java:3321)     @ java.awt.component.processevent(component.java:6270)     @ java.awt.container.processevent(container.java:2229)     @ java.awt.component.dispatcheventimpl(component.java:4861)     @ java.awt.container.dispatcheventimpl(container.java:2287)     @ java.awt.component.dispatchevent(component.java:4687)     @ java.awt.lightweightdispatcher.retargetmouseevent(container.java:4832)     @ java.awt.lightweightdispatcher.processmouseevent(container.java:4492)     @ java.awt.lightweightdispatcher.dispatchevent(container.java:4422)     @ java.awt.container.dispatcheventimpl(container.java:2273)     @ java.awt.window.dispatcheventimpl(window.java:2719)     @ java.awt.component.dispatchevent(component.java:4687)     @ java.awt.eventqueue.dispatcheventimpl(eventqueue.java:729)     @ java.awt.eventqueue.access$200(eventqueue.java:103)     @ java.awt.eventqueue$3.run(eventqueue.java:688)     @ java.awt.eventqueue$3.run(eventqueue.java:686)     @ java.security.accesscontroller.doprivileged(native method)     @ java.security.protectiondomain$1.dointersectionprivilege(protectiondomain.java:76)     @ java.security.protectiondomain$1.dointersectionprivilege(protectiondomain.java:87)     @ java.awt.eventqueue$4.run(eventqueue.java:702)     @ java.awt.eventqueue$4.run(eventqueue.java:700)     @ java.security.accesscontroller.doprivileged(native method)     @ java.security.protectiondomain$1.dointersectionprivilege(protectiondomain.java:76)     @ java.awt.eventqueue.dispatchevent(eventqueue.java:699)     @ java.awt.eventdispatchthread.pumponeeventforfilters(eventdispatchthread.java:242)     @ java.awt.eventdispatchthread.pumpeventsforfilter(eventdispatchthread.java:161)     @ java.awt.eventdispatchthread.pumpeventsforhierarchy(eventdispatchthread.java:150)     @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:146)     @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:138)     @ java.awt.eventdispatchthread.run(eventdispatchthread.java:91)

given integer.parseint takes string argument, it's safe sorteddata 3d string array. stacktrace, array sorteddata initialized individual elements are not.

the default value object types null. same applys values within object array.

make sure these elements have been assigned values prior invoking integer.parseint.

for (int i=0; < sorteddata.length; i++) {    (int j=0; j < sorteddata[i].length; j++) {       (int k=0; k < sorteddata[i][j].length; k++) {          sorteddata[i][j][k] = ... // string       }    } }

Comments

Post a Comment

Popular posts from this blog

SPSS keyboard combination alters encoding -

my question not have programming practical issue on spss. accident keyword combination cannot remember because did not intend press changed encoding in spss , text in data in different language english shown small boxes. nevertheless, when kind of analysis performed different language text shown in output. does know reason? tried change encoding did not produce result. first, @ edit > options , see whether setting unicode or locale. might fix it. if have text in multiple languages, want unicode. otherwise, may have specific locale set wrong. can change set locale, need know locale want use.
Read more

Add new record to the table by click on the button in Microsoft Access -

in ms access form want implement separate button, adds new record table. in order added button , attached button event: private sub btnaddrec_click() refresh codecontextobject on error resume next docmd.gotorecord , , acnewrec if err.number <> 0 btnaddrec.enabled = false end if end end sub everything ok when open window , click btnaddrec button, problem when first of perform navigation through existed records , after click on button. got runtime error: 2105: «you can't go specified record. may @ end of recordset» . how solve issue, need have ability add new record on click on specific button, no matter, have walked or not walked through records before. thanks. i created simple form field call description (and autonumber) , created button code follows click event. filled number of records , navigated through them, clicked addnewrec button. form navigated new record without issues. able click addnewrec button directly after ...
Read more

CSS3 Transition to highlight new elements created in JQuery -

i want use css3 color transition apply highlight-fading color effect (yellow transparent) new elements appended markup using jquery. css #content div { background-color:transparent; -moz-transition:background-color 2s; -webkit-transition:background-color 2s; -o-transition:background-color 2s; transition:background-color 2s; } #content div.new { background-color:yellow; } html <div id="content"></div> <a id="add-element" href="#">add new element</a> js $('#add-element').click(function() { var newelement = $('<div class="new">new element</div>'); $('#content').append(newelement); newelement.removeclass('new'); }); when click link, new element created. class "new" (background color yellow) , it's appended html markup. should able remove "new" class trigger background color transition transparent (or whate...
Read more