Category_5/MainActivity.java

package com.example;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    Button student,teacher;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        student = (Button) findViewById(R.id.student_button);
        teacher = (Button) findViewById(R.id.teacher_button);
        choose();
    }
    private void choose(){
        student.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this,StudentLogin.class);
                startActivity(intent);
            }
        });
        teacher.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, TeacherLogin.class);
                startActivity(intent);
            }
        });
    }
}