exit dialog in android studio in java

 MainActivity.java

AlertDialog.Builder builder
        = new AlertDialog
        .Builder(MainActivity.this);
builder.setMessage("Do you want to exit ?");
builder.setTitle("Alert !");

builder.setCancelable(false);
builder
        .setPositiveButton("Yes", (dialog, which) -> finish());
builder.setNegativeButton("No", (dialog, which) -> {
    dialog.cancel();
});

AlertDialog alertDialog = builder.create();
alertDialog.show();
break;