java - How to change a JTextField based on a JComboBox selection -


this silly program working on school having trouble. have jcombobox , based on user selects want change text field. i'm having trouble however, stands program compiles , runs text field doesn't change. i've found plenty of examples of people doing far more complicated things need simple solution. here code. thanks!

import javax.swing.*; import java.awt.*; import java.awt.event.*;  public class emocon extends jframe implements itemlistener { jpanel row1 = new jpanel(); jcombobox choose = new jcombobox(); jpanel row2 = new jpanel(); jtextfield text = new jtextfield(10); //image displayed here jpanel row3 = new jpanel(); jlabel pic = new jlabel();  //images imageicon happy = new imageicon("images/happy.gif"); imageicon lol = new imageicon("images/lol.gif"); imageicon winky = new imageicon("images/winky.gif"); imageicon sad = new imageicon("images/sad.gif"); imageicon worried = new imageicon("images/worried.gif"); imageicon angry = new imageicon("images/angry.gif"); imageicon shock = new imageicon("images/shock.gif"); imageicon uninpressed = new imageicon("images/uninpressed.gif"); imageicon yawn = new imageicon("images/yawn.gif"); imageicon evil = new imageicon("images/evil.gif");  public emocon(){     settitle("emoticon converter");     setsize(350,350);     setdefaultcloseoperation(jframe.exit_on_close);     setvisible(true);  gridlayout 2 = new gridlayout(3,1); setlayout(two);  choose.additem("happy");  choose.additem("lol");  choose.additem("winky");  choose.additem("sad");  choose.additem("worried");  choose.additem("angry");  choose.additem("shock");  choose.additem("uninpressed");  choose.additem("yawn");  choose.additem("evil"); choose.additemlistener(this); row1.add(choose); row2.add(text); row3.add(pic);  add(row1); add(row2); add(row3);  } @override public void itemstatechanged(itemevent item) { object source = item.getsource(); string emo = source.tostring(); if (emo == "sad"){     text.settext("hjgjhg"); } }    public static void main(string[] args) {     emocon emo = new emocon(); } }

you've problem here:

if (emo == "sad"){     text.settext("hjgjhg"); }

don't compare strings using ==. use equals(...) or equalsignorecase(...) method instead. understand == checks if 2 objects same not you're interested in. methods on other hand check if 2 strings have same characters in same order, , that's matters here. instead of

if (fu == "bar") {   // }

do, 

if ("bar".equals(fu)) {   // }

or,

if ("bar".equalsignorecase(fu)) {   // }

edit

your other problem you're getting source itemevent. source jcombobox, not want. need selected item!

try using different method available in itemevent object, not getsource().


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