cannot be resolved to a variable/Illegal modifier for parameter

我是eclipse初学者，请问一下提示错误：

1) cannot be resolved to a variable

2) Illegal modifier for parameter dis; only final is permitted

是怎么回事呢？我都是按照教程来的。。。

package hk.android;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.*;

public class MAIN extends Activity {

private Button btnDoSug;
private EditText edtSex, edtAge;
private TextView txtResult;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btnDoSug = (Button)findViewById(R.id.btnDoSug);
        edtSex = (EditText)findViewById(R.id.edtSex);
        edtAge = (EditText)findViewById(R.id.edtAge);
        txtResult = (TextView)findViewById(R.id.txtResult);

        btnDoSug.setOnClickListener(btnDoSugOnClick);
        // System said : btnDoSugOnClick cannot be resolved to a variable

private Button.OnClickListener btnDoSugOnClick = new Button.OnClickListener()  {
        // Illegal modifier for parameter btnDoSugOnClick; only final is permitted
         public void onClick(View v)   {
          String strSex = edtSex.getText().toString();
          int iAge = Integer.parseInt(edtAge.getText().toString());
          String strSug = "Reults=";

          if (strSex.equals("M"))
              if (iAge < 28)
                  strSug += "Not urgent";
                     else if (iAge > 33)
                            strSug += "Find Right one quickly";
                     else
                         strSug += "Enjoy your life now";
          else
                  if (iAge < 25)
                        strSug += "Not urgent";
                        else if (iAge > 30)
                               strSug += "Find Right one Quickly";
                        else
                            strSug += "Enjoy your life now";
                txtResult.setText(strSug);

         }
    };




    }
} --------------------编程问答-------------------- 1.局部变量一定要先定义，再使用
2.局部变量的定义，不需要private,public这些修饰符 --------------------编程问答-------------------- 1.btnDoSug.setOnClickListener(btnDoSugOnClick);
  这句放到btnDoSugOnClick的定义后面去

2.private Button.OnClickListener btnDoSugOnClick
  这句去掉 private

补充：Java ,  Eclipse