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Java 2021-09-15 18:51:04
java check if int is null
An int is not null, it may be 0 if not initialized. If you want an integer to be able to be null, you need to use Integer instead of int. Integer id; String name; public Integer getId() { return id; } Besides the statement if(person.equals(null)) can't... Add solution -
Other 2021-09-12 21:34:02
question mark when accessing property javascript
Optional chaining: (?.) The optional chaining operator (?.) enables you to read the value of a property located deep within a chain of connected objects without having to check that each reference in the chain is valid. The ?. operator is like the . ... Add solution -
Other 2021-09-11 12:47:03
writing on excel
The first creation part is same then go to a cell where you want to write. Row row = sheet.getRow(0) Cell cell = row.getCell(2) Let's imagine you have values in index 0 and index 1. Now you want to create a cell on index 2. First, check if it is null to... Add solution -
SQL 2021-09-07 15:27:01
sql left outer join vs left join
-- LEFT OUTER JOIN is equivalent to LEFT JOIN -- b.VALUE1 is null when ID not in table2 (idem for c.VALUE1 in table3) SELECT a.ID, a.NAME, b.VALUE1, c.VALUE1 FROM table1 a LEFT OUTER JOIN table2 b ON a.ID = b.ID LEFT OUTER JOIN table3 c ON a.ID = c.I... Add solution -
Javascript 2021-09-07 07:12:02
Get Country from the international phone number
/// <summary> /// Returns the Country based on an international dialing code. /// </summary> public static Country? GetCountry(ReadOnlySpan<char> phoneNumber) { if (phoneNumber.Length==0) return null; var isFirstDigit = true; Digi... Add solution -
C++ 2021-09-07 06:32:02
string literals in c++
#include <iostream> #include <string> #include <stdlib.h>// using c standard library int main() { "Caleb";//String literal is a series of characters between two double quotes //It is a const char array and array is just a p... Add solution