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Код

package javaapplication1;

import java.applet.Applet;
import java.awt.GridLayout;
import java.util.StringTokenizer;

import javax.swing.JButton;
import javax.swing.JTextField;

/**
 *
 * @author ANDREJ
 */
public class Main extends Applet {

    private final static String VOWELS = "qwrtpsdfghjklzxcvbnmQWRTPSDFGHJKLZXCVBNM";

    private JTextField txtInput = new JTextField(), txtOutput = new JTextField();


    //A-LA CONSTRUCTOR

    public void init(){

        this.setLayout(new GridLayout(3, 1));

        this.add(txtInput);
        this.add(txtOutput);


        JButton button = new JButton("Calculate");
        button.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {

                String sak = txtInput.getText();

                printMoreVowels(sak);
                {

                    {

                        int bl = 0, pl = 0;

                        for(int i=0; i<sak.length(); i++)
                        {
                            if(sak.charAt(i)=='a' || sak.charAt(i)=='e' || sak.charAt(i)=='i' || sak.charAt(i)=='o' || sak.charAt(i)=='u' || sak.charAt(i)=='y')
                                bl++;
                            else if(sak.charAt(i)=='A' || sak.charAt(i)=='E' || sak.charAt(i)=='I' || sak.charAt(i)=='O' || sak.charAt(i)=='U' || sak.charAt(i)=='Y')
                                bl++;
                            else if(sak.charAt(i)!=' ' &&( ((int)sak.charAt(i)>64 && (int)sak.charAt(i)<91) || ((int)sak.charAt(i)>96 && (int)sak.charAt(i)<123)))
                                pl++;
                        }

                        txtOutput.setText(
                                "Glasnyh = "+bl+" % glasnyh = "+bl*100/(bl+pl)+"%; " +
                                "Soglasnyh = "+pl+" % soglasnyh = "+pl*100/(bl+pl)+"%");
                    }

                }
            }
        });
        this.add(button);        
    }

    public static void printMoreVowels(String text) {

        if (text == null) {
            return;
        }

        StringTokenizer st = new StringTokenizer(text, " \t\r\n,.-:;\"'`!?(){}[]");

        String word = null;
        int max = 0;

        while (st.hasMoreTokens()) {
            String sak = st.nextToken();
            int n = 0;
            for (int i = 0, j = sak.length(); i < j; i++) {
                if (VOWELS.indexOf(sak.charAt(i)) != -1) {
                    n++;
                }
            }
            if (n > max) {
                max = n;
                word = sak;
            }
        }

        if (word != null) {
            System.out.println(word);
        }
    }
}