Main2Activity.java

package com.wotinstitutes.greetings;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        Intent intent = getIntent();
        int id =intent.getIntExtra("a",0);
        Toast.makeText(getApplicationContext(),String.valueOf(id).toString() ,Toast.LENGTH_LONG).show();
    }
}