swing - how to print a glyph of supplementary characters in java onto my JTextField when i just click the button -


i have simple program need set character unicode value larger character data type (supplementary character) on jtextfield when button click .tell me fed , how .this problem have taken 4 days. 

 //importing packages import java.awt.event.*; import javax.swing.*;  import java.util.*; import java.awt.*;  //my own custom class  public class unicodetest implements actionlistener { jframe jf; jlabel jl; jtextfield jtf; jbutton jb; unicodetest() {     jf=new jframe();// making frame     jf.setlayout(null); //seting layout null of frame container     jl=new jlabel("enter text"); //making label      jtf=new jtextfield();// making textfied onto character shown     jb=new jbutton("enter"); //setting bounds      jl.setbounds(50,50,100,50);     jtf.setbounds(50,120,400,100);     jb.setbounds(50, 230, 100, 100);     jf.add(jl);jf.add(jtf);jf.add(jb);     jf.setsize(400,400);     jf.setvisible(true); //making frame visible     jb.addactionlistener(this); //  registering listener object } public void actionperformed(actionevent e) // event generated on button click {   try{             int x=66560; //to print character of code point             jtf.settext(""+(char)x);// have set textfiled code point character supplementary in case            }      catch(exception ee)// caughting exception if arrived         { ee.printstacktrace(); // trace stack frame exception arrive          }    }    // making main method starting point of our program   public static void main(string[] args)    {      //creating , showing application's gui.       new unicodetest();        } }

since not giving enough information on what's wrong, can guess either or both:

  1. you not using font can display character.
  2. you not giving text field correct string representation of text.

setting font can display character

not fonts can display characters. have find 1 (or more) can , set swing component use font. fonts available system dependent, works might not work others. can bundle fonts when deploy application ensure works everyone.

to find font on system can display character, used

font[] fonts = graphicsenvironment.getlocalgraphicsenvironment().getallfonts(); (font f : fonts) {     if (f.candisplay(66560)) {         system.out.println(f);         textfield.setfont(f.derivefont(20f));     } }

the output (for me) single font, allowed myself set in loop:

java.awt.font[family=segoe ui symbol,name=segoe ui symbol,style=plain,size=1]

as noted in comments question andrew thompson.

giving text field correct string representation

the text fields require utf-16. supplementary characters in utf-16 encoded in 2 code units (2 of these: \u12cd). assuming start codepoint, can convert characters , make string them:

int x = 66560; char[] chars = character.tochars(x); // chars [0] \ud801 , chars[1] \udc00 textfield.settext(new string(chars)); // string "\ud801\udc00" // or textfield.settext(new string(character.tochars(x)));

as notes andrew thompson in comments answer (previously used stringbuilder).

enter image description here


Comments

Post a Comment

Popular posts from this blog

javascript - jQuery: Add class depending on URL in the best way -

i have html progress meter: <div class="col-md-3" style="margin-left: -20px;"> <div class="progress-pos active" id="progess-1"> <div class="progress-pos-inner"> login </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-2"> <div class="progress-pos-inner"> scan items </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-3"> <div class="progress-pos-inner"> confirm address </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-4"> <div class="progress-pos-in
Read more

caching - How to check if a url path exists in the service worker cache -

i need check if particular url path exists in service worker cache. example, suppose url is: /myserviceworker/service?a=110&b=70 this url exists in cache, there many of them different values of , b. now, suppose want refresh of these urls, how can that? i want know how access key values service worker cache. if know key, plan follows: var url = new url(key); if(url.pathname === "\/myserviceworker/service") refetch key but not sure how cache key , in format is. mean, string or url? cache api has match() method returns promise resolving in response object if match or undefined if no match exists. second parameter object can specify ignoresearch not take account url parameters. the ignoresearch option supported firefox ( chrome status here ). in other hand, retrieve cache entries, can use keys() method.
Read more

Redirect to a HTTPS version using .htaccess -

i need modify .htaccess file redirect urls https version without "www". http://example.com --> https://example.com http://www.example.com --> https://example.com https://www.example.com --> https://example.com this how .htaccess file looks like: rewriteengine on rewritecond %{request_filename} !-d rewritecond %{request_filename} !-f rewriterule ^(.*)$ redirect.php?id=$1&page=$2 [qsa,l] what modifications need make .htaccess in order forward https without "www"? it depends on doing current code. looks file called redirect trying display php page seo friendly url. think might confusing people. anyway, need , force https without www, need 1 more rule above. also second rule needs two capture groups in rewriterule test string because wanting 2 different values using $1 , $2 references. rewriteengine on #rediect www non www and/or http https --- combinations. rewritecond %{http_host} !^example\.com [nc,or] rewritecond %{https} !^
Read more