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).

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