Use unicode in JOptionInputDialog with indexOf?

Question

I cannot use indexOf for unicode. Is there any alternative / solution?
public static void main(String[] args) {
            // The following is perfect.
       String nonAsciiString="中國茶在中國生產。China.";
       int nonAsciiInt=nonAsciiString.indexOf("生");
       System.out.println(nonAsciiInt);
       String nonAsciiDislogX= "";
       nonAsciiDislogX= JOptionPane.showInputDialog(null,"Dialog X: Enter  生: ","",-1);
nonAsciiInt=nonAsciiString.indexOf(nonAsciiDislogX);
       System.out.println(nonAsciiInt);
       // It gives the correct expected answer: 6
                          // The above is perfect.
       // The following is problematic.
          JTextPane     nonAsciiJTextPane = new JTextPane(); // create third textarea
   nonAsciiJTextPane.setContentType("text/html");
   nonAsciiJTextPane.setText("<b>&#20013;&#22283;&#33590;&#21619;&#36947;&#22909;&#65292;&#22312;&#20013;&#22283;&#29983;&#29986;&#12290;China.</b>");
    String nonAsciiJTextPaneText= nonAsciiJTextPane.getText();
   String  nonAsciiDialogA= JOptionPane.showInputDialog(null,"Dialog A: Enter &#29983;: ","",-1);
   nonAsciiInt=nonAsciiJTextPaneText.indexOf(nonAsciiDialogA);
       System.out.println(nonAsciiInt);
       // Here is the unicode problem:
       // "-1" is shown and it means that  "&#29983;" is not found.
       // Why is  "&#29983;" not found?
        // When you enter "China", "151" is displayed.
       // China should be the 13th character.
       // Why is "151" displayed.
        }

Answer 1

import javax.swing.*;
public class TestChin{
public static void main(String[] args) {
            // The following is perfect.
       String nonAsciiString="&#20013;&#22283;&#33590;&#22312;&#20013;&#22283;&#29983;&#29986;&#12290;China.";
       int nonAsciiInt=nonAsciiString.indexOf("&#29983;");
       System.out.println(nonAsciiInt);
       String nonAsciiDislogX= "";
       nonAsciiDislogX= JOptionPane.showInputDialog(null,"Dialog X: Enter  &#29983;: ","",-1);
nonAsciiInt=nonAsciiString.indexOf(nonAsciiDislogX);
       System.out.println(nonAsciiInt);
       // It gives the correct expected answer: 6
                          // The above is perfect.
       // The following is problematic.
          JTextPane     nonAsciiJTextPane = new JTextPane(); // create third textarea
   //nonAsciiJTextPane.setContentType("text/html");
   nonAsciiJTextPane.setText("&#20013;&#22283;&#33590;&#21619;&#36947;&#22909;&#65292;&#22312;&#20013;&#22283;&#29983;&#29986;&#12290;China.");
    //nonAsciiJTextPane.setContentType("text/html");
    String nonAsciiJTextPaneText=null;
try{
    nonAsciiJTextPaneText= new String(nonAsciiJTextPane.getText().getBytes(),"Big5");
    System.out.println("yyy"+nonAsciiJTextPaneText);
catch (Exception e){System.out.println("exception");}
   String  nonAsciiDialogA= JOptionPane.showInputDialog(null,"Dialog A: Enter &#29983;: ","",-1);
   nonAsciiInt=nonAsciiJTextPaneText.indexOf(nonAsciiDialogA);
       System.out.println(nonAsciiInt);
}