用java做个小界面，三个组件，两个文本框，一个输入数，用逗号隔开，一个输出框，一个排序按钮。该如何解决

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class MyFrame2 extends JFrame implements ActionListener {
    JTextField textinput;
    JTextField textoutput;
    JButton sort;
    void init(){

        textinput=new JTextField(20);
        textoutput=new JTextField(20);
        sort=new JButton("排序");
        add(textinput);
        add(textoutput);
        add(sort);
        sort.addActionListener(this);
    }
    public MyFrame2()
    {
        init();
        this.setLayout(new FlowLayout());
//        this.setBounds(100,100,190,150);
        this.pack();
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }


    @Override
    public void actionPerformed(ActionEvent e) {
        String s1=textinput.getText();
//        s1.split("");
        String[] ss;
        ss=s1.split(",");

        for(int i=0 ; i < ss.length ; ++i)
        {
            for(int j=0; j <ss.length - i - 1; ++j)
            {
                int x,t;
                x=Integer.parseInt(ss[j]);
                t=Integer.parseInt(ss[j+1]);
                if(x>t){
                    String temp1;
                    temp1 = ss[j];
                    ss[j]=ss[j+1];
                    ss[j+1]=temp1;
                }

            }
        }
        String output="";
        int temp=0;
        for(String s:ss){
            if(temp==0){
                output=output+s;
            }
            else
                output=output+","+s;
            temp++;
        }

        textoutput.setText(output);





// TODO Auto-generated method stub

    }

    public static void main(String[] args) {
        new MyFrame2();
    }

}