KanshuYokoo

private <E extends RealmModel> E saveToRealm(E model) {
        E result_model;
        try {
            Realm realm = Realm.getDefaultInstance();
            realm.beginTransaction();
            result_model = realm.copyToRealmOrUpdate(model);
            realm.commitTransaction();
            realm.close();
        } catch (RealmException ex) {
            throw ex;

KanshuYokoo

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <stroke
        android:width="5dp"
        android:color="@android:color/holo_blue_light" />
    <padding
        android:left="2dp"
        android:top="2dp"
        android:right="2dp"
        android:bottom="10dp" />

KanshuYokoo

        Button mBack;
        mBack = findViewById(R.id.myBackButton);
        mBack.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v)
            {
                MyActivity.this.finish();
            }

KanshuYokoo

public class LoginActivity extends AppCompatActivity implements View.OnClickListener, TextWatcher {

    userData user;
    private Button mLoginButton;
    private EditText mLoginID;
    private EditText mLoginPW;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    mLoginID = findViewById(R.id.loginEdit);

KanshuYokoo

public class StartActivity extends AppCompatActivity implements ResultHandleInterface {

 private ProgressBar mCycler;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        new APITask(this).execute(place);

KanshuYokoo

            
            Date currentTime = myCalendar.getTime();
            SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyyMMdd");
            SimpleDateFormat timeFormatter = new SimpleDateFormat("HHmm");
            timeToSend = timeFormatter.format(currentTime);
            dateToSend = dateFormatter.format(currentTime);
            

KanshuYokoo

// 1000 to 00001000
int myNumber = 1000;
String.format("%08d", myNumber);

KanshuYokoo

String example = "AnyString";
int paddingLength = 12;
String.format("%0"+ (paddingLength - example.length() )+"d%s",0 ,example); 

KanshuYokoo

        DispatchQueue.main.async() {
            [unowned self] in
            self.performSegue(withIdentifier: "toSecond", sender: nil)
        }

KanshuYokoo

   class ViewController: UIViewController,UITextFieldDelegate {

    @IBOutlet weak var text1: UITextField!
    @IBOutlet weak var text2: UITextField!
    @IBOutlet weak var button1Outlet: UIButton!
    
   
   func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        var t1 = text1.text
        if(textField.tag == 0){