JAVA 2nd file for android database

package com.example.database;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class Database2 extends AppCompatActivity {

    Button back;
    Button next;
    Button homeb;
    TextView text1;
    TextView text2;
    SQLiteDatabase db;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_database2);

        text1 = (TextView) findViewById(R.id.tname);
        text2 = (TextView) findViewById(R.id.cname);
        back = (Button) findViewById(R.id.bb1);
        next = (Button) findViewById(R.id.bb2);
        homeb = (Button) findViewById(R.id.bb3);

        db = openOrCreateDatabase("Mydb",MODE_PRIVATE,null);
        final Cursor c = db.rawQuery("select * from student",null);
        c.moveToFirst();

        text1.setText(c.getString(c.getColumnIndex("name")));
        text2.setText(c.getString(c.getColumnIndex("college")));

        next.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                try {
                    c.moveToNext();
                    text1.setText(c.getString(c.getColumnIndex("name")));
                    text2.setText(c.getString(c.getColumnIndex("college")));
                }catch (Exception e){
                    Toast.makeText(getApplicationContext(),"Last Record",Toast.LENGTH_LONG).show();
                    e.printStackTrace();
                }

            }
        });

        back.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                try {
                    c.moveToPrevious();
                    text1.setText(c.getString(c.getColumnIndex("name")));
                    text2.setText(c.getString(c.getColumnIndex("college")));
                }catch (Exception e) {
                    Toast.makeText(getApplicationContext(),"First Record",Toast.LENGTH_LONG).show();
                    e.printStackTrace();
                }

            }

        });


        homeb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent a = new Intent(Database2.this, MainActivity.class);
                startActivity(a);
                finish();
            }
        });


    }
}