1. package com.example.student.first;
2.  
3. import android.support.v7.app.AppCompatActivity;
4. import android.os.Bundle;
5. import android.view.View;
6. import android.widget.Button;
7. import android.widget.EditText;
8. import android.widget.TextView;
9. import android.view.View.OnClickListener;
10.  
11.  
12. public abstract class MainActivity extends AppCompatActivity implements OnClickListener  {
13.     Button btnClick;
14.     TextView tV;
15.     EditText eT1;
16.     EditText eT2;
17.     @Override
18.     protected void onCreate(Bundle savedInstanceState) {
19.         super.onCreate(savedInstanceState);
20.         setContentView(R.layout.activity_main);
21.         btnClick = (Button) findViewById(R.id.button2);
22.         btnClick.setOnClickListener(this);
23.         tV = (TextView) findViewById(R.id.textView7);
24.         eT1 = (EditText) findViewById(R.id.editText2);
25.         eT2 = (EditText) findViewById(R.id.editText3);
26.  
27.     }
28.     @Override
29.     public void onClick(View v) {
30.         String name = eT1.getText().toString() + eT2.getText().toString();
31.         tV.setText(name);
32.     }
33.  
34. }
35.