[JAVA] Morse Decoder GUI (German)

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.JTextField;

//import Program1.btnDoAction;
//import Program1.thread1;

import java.awt.event.*;
import java.awt.*;
import java.util.Random;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;






public class GUI extends JFrame {

    JLabel Text = new JLabel("Morsedecoder");
    JTextField Output;

    JButton Decode;
    JButton Short;
    JButton Long;
    JButton Clear;
    JButton Save;

    JLabel Comp;

    String temp1="";
    String comp="";

    Queue Morse;

    int out=0;

    BinaryTree baum0;
    BinaryTree baumA;
    BinaryTree baumB;
    BinaryTree baumC;
    BinaryTree baumD;
    BinaryTree baumE;
    BinaryTree baumF;
    BinaryTree baumG;
    BinaryTree baumH;
    BinaryTree baumI;
    BinaryTree baumJ;
    BinaryTree baumK;
    BinaryTree baumL;
    BinaryTree baumM;
    BinaryTree baumN;
    BinaryTree baumO;
    BinaryTree baumP;
    BinaryTree baumQ;
    BinaryTree baumR;
    BinaryTree baumS;
    BinaryTree baumT;
    BinaryTree baumU;
    BinaryTree baumV;
    BinaryTree baumW;
    BinaryTree baumX;
    BinaryTree baumY;
    BinaryTree baumZ;
    BinaryTree baumÜ;
    BinaryTree baumCH;
    BinaryTree baumÖ;
    BinaryTree baumÄ;

    public GUI()
    {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(380, 300);
        setTitle("Morsedecoder");
        setLayout(null);
        setLocationRelativeTo(null);

        Decode = new JButton("Decode");
        Decode.setBounds(10,100,150,30);
        Decode.addActionListener(new UnserListener());
        add(Decode);

        Clear = new JButton ("Clear");
        Clear.setBounds(10,150,150,30);
        Clear.addActionListener(new UnserListener());
        add(Clear);

        Short = new JButton("Morse - kurz");
        Short.setBounds(200,100,150,30);
        Short.addActionListener(new UnserListener());
        add(Short);

        Long = new JButton("Morse - long");
        Long.setBounds(200,150,150,30);
        Long.addActionListener(new UnserListener());
        add(Long);

        Save = new JButton("Wort speichern");
        Save.setBounds(50,200, 300, 30);
        Save.addActionListener(new UnserListener());
        add(Save);

        Comp = new JLabel("");
        Comp.setBounds(50, 235, 300, 30);
        add(Comp);

        Output = new JTextField("");
        Output.setBounds(10, 50, 350,   30);
        Output.addActionListener(new UnserListener());
        add(Output);

        Text.setBounds(10,20, 150, 30);
        add(Text);
        baumB = new BinaryTree("B");
        baumX = new BinaryTree("X");
        baumC = new BinaryTree("C");
        baumY = new BinaryTree("Y");
        baumQ = new BinaryTree("Q");
        baumZ = new BinaryTree("Z");
        baumÖ = new BinaryTree("Ö");
        baumCH = new BinaryTree("CH");
        baumO = new BinaryTree("O",baumÖ,baumCH);
        baumG = new BinaryTree("G",baumZ,baumQ);
        baumK = new BinaryTree("K",baumC,baumY);
        baumD = new BinaryTree("D",baumB,baumX);
        baumM = new BinaryTree("M",baumG,baumO);
        baumN = new BinaryTree("N",baumD,baumK);
        baumT = new BinaryTree("T",baumN,baumM);
        baumÜ = new BinaryTree("Ü");
        baumL = new BinaryTree("L");
        baumÄ = new BinaryTree("Ä");
        baumP = new BinaryTree("P");
        baumJ = new BinaryTree("J");
        baumF = new BinaryTree("F");
        baumV = new BinaryTree("V");
        baumH = new BinaryTree("H");
        baumW = new BinaryTree("W", baumP, baumJ);
        baumR = new BinaryTree("R", baumL, baumÄ);
        baumU = new BinaryTree("U", baumF, baumÜ);
        baumS = new BinaryTree("S", baumH, baumV);
        baumA = new BinaryTree("A", baumR, baumW);
        baumI = new BinaryTree("I", baumS, baumU);
        baumE = new BinaryTree("E", baumI, baumA);
        baum0 = new BinaryTree(0, baumE, baumT);
        Morse = new Queue();

    }

    public class UnserListener implements ActionListener
    {

         public void actionPerformed(ActionEvent arg0)
         {

            if(arg0.getSource()==Short)
            {

                Morse.enqueue(0);

            }

            if(arg0.getSource()==Long)
            {

                Morse.enqueue(1);
            }

            if(arg0.getSource()==Clear)
            {
                while(!Morse.isEmpty())
                {
                    Morse.dequeue();
                }
                Output.setText(null);
                temp1="";

            }

            if(arg0.getSource()==Decode)
            {
                rechner(baum0);
                while(!Morse.isEmpty())
                {
                    Morse.dequeue();
                }
            }

            if(arg0.getSource()==Save)
            {
                Output.setText("");
                comp=comp+" "+temp1;
                Comp.setText(comp);
                temp1="";
                while(!Morse.isEmpty())
                {
                    Morse.dequeue();
                }

            }

         }

    }

    public void rechner(BinaryTree pTree)
    {

        if(!Morse.isEmpty() && pTree.getObject()!=null)
        {
            int temp = (Integer)Morse.front();
            if(temp==0)
            {
                Morse.dequeue();
                rechner(pTree.getLeftTree());

            }
            else if(temp==1)
            {
                Morse.dequeue();
                rechner(pTree.getRightTree());

            }
        }

        else if(Morse.isEmpty() && pTree.getObject()!=null)
        {
            temp1 = temp1 + "" + pTree.getObject();
            Output.setText(temp1);
        }

        else if(pTree.getObject()==null)
        {
            while(!Morse.isEmpty())
            {
                Morse.dequeue();
            }
            Output.setText("Bitte richtiges Morse eingeben");

        }
    }

}