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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 mainactivityactivty is public, should be declared in a file named mainactivityactivty.java
public class mainactivityactivty extends AppCompatActivity {
       ^
Main.java:1: error: cannot find symbol
public class mainactivityactivty extends AppCompatActivity {
                                         ^
  symbol: class AppCompatActivity
Main.java:5: error: cannot find symbol
    private Button button;
            ^
  symbol:   class Button
  location: class mainactivityactivty
Main.java:8: error: cannot find symbol
    protected void onCreate(Bundle savedInstanceState) {
                            ^
  symbol:   class Bundle
  location: class mainactivityactivty
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 mainactivityactivty
Main.java:10: error: package R does not exist
        setContentView(R.layout.mainactivityactivty);
                        ^
Main.java:13: error: cannot find symbol
        textView = (TextView) findViewById(R.id.textView);
        ^
  symbol:   variable textView
  location: class mainactivityactivty
Main.java:13: error: cannot find symbol
        textView = (TextView) findViewById(R.id.textView);
                    ^
  symbol:   class TextView
  location: class mainactivityactivty
Main.java:13: error: package R does not exist
        textView = (TextView) findViewById(R.id.textView);
                                            ^
Main.java:16: error: cannot find symbol
        editText = (EditText) findViewById(R.id.editText);
        ^
  symbol:   variable editText
  location: class mainactivityactivty
Main.java:16: error: cannot find symbol
        editText = (EditText) findViewById(R.id.editText);
                    ^
  symbol:   class EditText
  location: class mainactivityactivty
Main.java:16: error: package R does not exist
        editText = (EditText) findViewById(R.id.editText);
                                            ^
Main.java:18: error: cannot find symbol
		Button button = (Button) findViewById(R.id.button);
		^
  symbol:   class Button
  location: class mainactivityactivty
Main.java:18: error: cannot find symbol
		Button button = (Button) findViewById(R.id.button);
		                 ^
  symbol:   class Button
  location: class mainactivityactivty
Main.java:18: error: package R does not exist
		Button button = (Button) findViewById(R.id.button);
		                                       ^
Main.java:21: error: package View does not exist
        button.setOnClickListener(new View.OnClickListener() {
                                          ^
17 errors

Standard output is empty