CheckBox Android

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package com.example.myapplication;

 import androidx.appcompat.app.AppCompatActivity; 

import android.os.Bundle; import android.view.View; 

import android.widget.CheckBox; 

import android.widget.Toast; 

 public class MainActivity extends AppCompatActivity { 

 private CheckBox S1,S2,S3; 

 @Override

 protected void onCreate(Bundle savedInstanceState) { 

super.onCreate(savedInstanceState); 

setContentView(R.layout.activity_main); 

S1= (CheckBox) findViewById(R.id.checkBox); 

S2= (CheckBox) findViewById(R.id.checkBox2); 

S3= (CheckBox) findViewById(R.id.checkBox3); 

 } 

 public void seleccion(View view){ 

 String memoria=""; 

 if(S1.isChecked()==true) { memoria= memoria + "seleccion 1 " + " "; } if(S2.isChecked()==true){ memoria= memoria + " seleccion 2 "; } if(S3.isChecked()==true){ memoria= memoria + " seleccion 3 ";  }

Toast.makeText(this,"has seleccionado la opcion: "+ memoria + "" ,Toast.LENGTH_LONG).show(); } }