Tags down


Why my String is returning as a blank string?(JAVA)

By : Toby Zhong
Date : September 15 2020, 06:00 PM
Hope that helps There are two issues:
Since strings are immutable, you must assign the result of .concat(String) to the variable if you want it to be updated. Comparing strings must be done using .equals()
code :
static String timeConversion(String s)
    // Expecting a string in the format "HH:MM:SSAM" or "HH:MM:SSPM"
    int hr = Integer.parseInt(s.substring(0, 2));
    String min = s.substring(3, 5);
    String sec = s.substring(6, 8);
    String ap = s.substring(8, 10);
    String res = "";
    if (ap.equals("AM")) {
        if (hr == 12) {
            res = res.concat("00" + ":" + min + ":" + sec);
        } else {
            res = res.concat(hr + ":" + min + ":" + sec);
    } else if (ap.equals("PM")) {
        hr = hr + 12;
        res = res.concat(hr + ":" + min + ":" + sec);
    return res;

Share : facebook icon twitter icon

How to deserialize a blank JSON string value to null for java.lang.String?

By : user3801560
Date : March 29 2020, 07:55 AM
To fix the issue you can do Jackson will give you null for other objects, but for String it will give empty String.
But you can use a Custom JsonDeserializer to do this:
code :
class CustomDeserializer extends JsonDeserializer<String> {

    public String deserialize(JsonParser jsonParser, DeserializationContext context) throws IOException, JsonProcessingException {
        JsonNode node = jsonParser.readValueAsTree();
        if (node.asText().isEmpty()) {
            return null;
        return node.toString();

class EventBean {
    public Long eventId;
    public String title;

    @JsonDeserialize(using = CustomDeserializer.class)
    public String location;

Returning the part of a string that is found before the first blank line in the string in Python

By : Alexander Kovalenko
Date : March 29 2020, 07:55 AM
will help you I have a string that has allot of blank lines, I need to return the chunk of that string that is found before the first blank line in it. For Example:
code :
def find(string):
    return string[:string.find('\n\n')]

Why is String.strip() 5 times faster than String.trim() for blank string In Java 11

By : user2155519
Date : March 29 2020, 07:55 AM
wish of those help On OpenJDK 11.0.1 String.strip() (actually StringLatin1.strip()) optimizes stripping to an empty String by returning an interned String constant:
code :
public static String strip(byte[] value) {
    int left = indexOfNonWhitespace(value);
    if (left == value.length) {
        return "";
return ((st > 0) || (len < value.length)) ?
        newString(value, st, len - st) : null;
return new String(Arrays.copyOfRange(val, index, index + len),
@Warmup(iterations = 10, time = 200, timeUnit = MILLISECONDS)
@Measurement(iterations = 20, time = 500, timeUnit = MILLISECONDS)
public class MyBenchmark {

  public static final String EMPTY_STRING = "   "; // 3 whitespaces
  public static final String NOT_EMPTY_STRING = "  a "; // 3 whitespaces with a in the middle

  public void testEmptyTrim() {

  public void testEmptyStrip() {

  public void testNotEmptyTrim() {

  public void testNotEmptyStrip() {

Benchmark                       Mode  Cnt           Score           Error  Units
MyBenchmark.testEmptyStrip     thrpt  100  1887848947.416 ± 257906287.634  ops/s
MyBenchmark.testEmptyTrim      thrpt  100   206638996.217 ±  57952310.906  ops/s
MyBenchmark.testNotEmptyStrip  thrpt  100   399701777.916 ±   2429785.818  ops/s
MyBenchmark.testNotEmptyTrim   thrpt  100   385144724.856 ±   3928016.232  ops/s

IF function returning "value_if_false" as a blank string instead of a blank number

By : user2325185
Date : March 29 2020, 07:55 AM
around this issue , you can do this like:
code :
=IF(AND(ISNUMBER(B17), ISNUMBER(H10)), TEXT(B17-H10, "0"), )
=IF(AND(ISNUMBER(B17), ISNUMBER(H10)), TEXT(B17-H10, "#"), )

Function returning blank string

By : modrzyk
Date : March 29 2020, 07:55 AM
Any of those help The reason for the returning of a blank string is that res.moveToFirst() is false (so your SQL query result was empty) and the if-block will never get run, and thus s will always keep its initial value of "".
The alternative reason could be that the expression is true, but res.getString(res.getColumnIndex("word")) returns a blank string.
Related Posts Related Posts :
  • Mockito is not mocking the method
  • Sum of double values, strange result
  • How to integrate a spring boot application using spring cloud stream to IBM event streams on bluemix cloud
  • Counting number of days of a particular month when given a duration
  • JUnit test for void method ( output-input dependency )
  • Why does Collections.unmodifiableMap not check if the map passed is already an UnmodifiableMap?
  • ServiceLoader and services which are valid at all times
  • How to Run Cron Jobs in Kotlin Ktor?
  • How do I deserialize array of different types with GSON
  • Gradle Plugin dependency
  • java saying 'cannot find symbol' though method is declared in class
  • How to minimize the sum of the elements in the final array after performing k number of operation
  • Can I generate a jar with maven without method bodies in Java?
  • Java/Kotlin callback syntax - do I really need 2 callback definitions after conversion to Kotlin?
  • Spring boot RESTful - three tier architecture
  • What is a big double that I can use to simulate infinity?
  • Java Socket does not error but is not functional(?)
  • how can I get specific value of an array list using stream
  • I Can't Write A Triangle Pattern in Java
  • Unique Identifier for a video file in Android
  • How do I get a response to a http in java?
  • I don't know (Unresolved compilation problem:)
  • Custom ordering MSSQL hibernate Spring boot 2
  • How to build and run okhttp 3.10.0
  • ArrayList errors
  • How to create a partitioned table in BigQuery from java?
  • (JNI) Get Java method's memory address with GetMethodID
  • Java: Unable to understand for loop behaviour
  • Java - Rounding BigDecimal value with 2 decimal place at 2 levels
  • Minecraft-moding: Mod works only in IDE but not when exported as jar
  • Increasing Number Of Treads Cause The Longer Loop Duration
  • Using Java streams to find mode when there might be multiple modes?
  • How to access classes Vector of a Classloader in Java 12?
  • Java Regex: find single quoted text with escapes
  • How to Convert String of numbers to a distinct ArrayList
  • How to know if a date is in previous x minutes?
  • In Java, the expression "+ + + + + +" is executed, the compiler reports no errors and can execute correctly?
  • Long string concatenation problem in java?
  • How to get current week number and year in Java using GregorianCalendar?
  • What is the difference between ThreadContext.put() and MDC.Put()?
  • Mapstrut/Lombok: No property named "customfields" exists in source parameter(s) as on Dec 31 2019
  • Java:Add name of each instance of object to list
  • What is the more idiomatic use of super and extends in this case?
  • HttpConnect fails in android
  • How to add two Optional<Long> in java
  • While formatting a float number using System.out.format(), irrelevant answers are shown up. Why?
  • Operate a given Java stream pairwise
  • How do load a Service without using ServiceLoader.Provider class (for J1.8 compatibility)
  • Issues with creating gradle project in IntelliJ
  • How to create file choosers similar to default windows boxes?
  • Your code did not execute within the time limits in Hackerrank
  • How Do You Login To An ASPX Website Using A Jsoup
  • My do while loop is stopping after one iteration. how do I keep it going?
  • How do I repeatedly check if the user is verified in the Firebase Authentication?
  • keeping an android service running for a long time
  • Liveness / Health probe for Java threaded application
  • I am not very beginner of coding in java, But I need some help in understanding the constructor in java
  • Maven Shade : include only specific artifacts and exclude all the rest
  • Why does the "this" keyword print exactly what toString() is printing?
  • Lower and Upper Bound for Java Wildcard Type
  • shadow
    Privacy Policy - Terms - Contact Us © 35dp-dentalpractice.co.uk