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public class mainactivityactivty extends AppCompatActivity {
 
    //private TextView textView123;
    //private Button button;
 
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout);
 
        TextView textView123 = (TextView) findViewById(R.id.textView);
        //textView123 = (TextView) findViewById(R.id.textView);
 
        Button button = (Button) findViewById(R.id.button);
        //button = (Button) findViewById(R.id.button);
 
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
 
 
                textView123.setText("12345");
            }
        });
 
    }
}

Main.java:1: error: class mainactivityactivtyname001 is public, should be declared in a file named mainactivityactivtyname001.java
public class mainactivityactivtyname001 extends AppCompatActivity {
       ^
Main.java:1: error: cannot find symbol
public class mainactivityactivtyname001 extends AppCompatActivity {
                                                ^
  symbol: class AppCompatActivity
Main.java:8: error: cannot find symbol
    protected void onCreate(Bundle savedInstanceState) {
                            ^
  symbol:   class Bundle
  location: class mainactivityactivtyname001
Main.java:7: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:9: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class mainactivityactivtyname001
Main.java:10: error: package R does not exist
        setContentView(R.layout.layoutname001);
                        ^
Main.java:12: error: cannot find symbol
        TextView textView123 = (TextView) findViewById(R.id.textView);
        ^
  symbol:   class TextView
  location: class mainactivityactivtyname001
Main.java:12: error: cannot find symbol
        TextView textView123 = (TextView) findViewById(R.id.textView);
                                ^
  symbol:   class TextView
  location: class mainactivityactivtyname001
Main.java:12: error: package R does not exist
        TextView textView123 = (TextView) findViewById(R.id.textView);
                                                        ^
Main.java:15: error: cannot find symbol
        Button button = (Button) findViewById(R.id.button);
        ^
  symbol:   class Button
  location: class mainactivityactivtyname001
Main.java:15: error: cannot find symbol
        Button button = (Button) findViewById(R.id.button);
                         ^
  symbol:   class Button
  location: class mainactivityactivtyname001
Main.java:15: error: package R does not exist
        Button button = (Button) findViewById(R.id.button);
                                               ^
Main.java:18: error: package View does not exist
        button.setOnClickListener(new View.OnClickListener() {
                                          ^
13 errors

Standard output is empty