how to call the start activity from one java class

Question

Is it possible to start an Activty using an Intent in a general java class which extends Activity?

 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.Spinner;
 import android.app.Activity;
 import android.content.Intent;

 public class SubActivity extends Activity{

          protected void onCreate(Bundle savedInstanceState) {
                 super.onCreate(savedInstanceState);
                 setContentView(R.layout.activity_main);
           }           
 }

And a general java class like the following

class TestClass extends Activity{

       void firstsem(){
        Intent t = new Intent(this, SubActivity.class);
        t.putExtra("sub1","chemistry");                 
        startActivity(t);
   }
}

Is it possible to start an Activity from an general java class? Could anybody show me how to achieve this?

Answer 1

In Kotlin this is how you can do it

I am asuming that you have context available

val intent = Intent(context, YourActivity::class.java)
context.startActivity(intent)
(context as Activity).finish()

Answer 2

Start new Activity in a single line of code.

startActivity(new Intent(this, ActivityName.class));