Example 1: Check if String is Empty or Null class Main { public static void main(String[] args) { // create null, empty, and regular strings String str1 = null; String str2 = ""; String str3 = " "; // check if str1 is null or empty System.out.println("str1 is " + is...
It returns true if the String contains at least one character and false otherwise. It doesn’t treat white spaces as empty: scala> val str1: String = "Hello" scala> val str2: String = "" scala> val str3: String = " " scala> println(str1.isEmpty) // false scala> println(str1...
Check if Column Is Null or Empty in MySQL The steps to filter out the null or empty column values present inside the table are given in the section ahead. The syntax for NULL or Empty check is: Selectexpression[,expression2]...FROMtable-name[WHEREcolumn-nameISNULLorcolumn-name=''] ...
The string.IsNullOrEmpty() method is used to check if a string has null or string.Empty value in it or not in C#.
Program 1: Check If a String is Empty or NullIn this program, we will learn how to check if a string is empty or null using a relational operator.Algorithm:Start Declare a string. Initialize it with some values. Use a relational operator to check whether the entered string is null or...
Check if String is Null or Empty in Java Java: Check if String is Numeric How to Convert String to int in Java Reverse a String in Java Convert int to String in Java How to Split a String in Java: Different Examples Convert Char to String in Java ...
public class NullOrEmptyCheckExample { public static void main(String[] args) { String str1 = null; String str2 = ""; String str3 = "Hello, World!"; // Check if str1 is null or empty if (str1 == null || str1.length() == 0) { System.out.println("str1 is null or empty...
Check if a string is null or empty in XSLT 多条件查询 string.Format("/root/deviceList//item/guid[{0}]", strBuilder.ToString()) "/root/deviceList//item/guid[text()=\"h\" or text()=\"a\" or text()=\"c\"]"谓词嵌套var nodes = xmlDoc.SelectNodes(string.Format("/root/device...
Checking if a string is NULL or EMPTY is very common requirement in Powershell script. If we don’t do that we will end up with run time errors if we try to perform some operation on that string variable which is empty or null. So the question now is, how to check it?
In application programming, it is advisable to check both if list is not null and then not empty. If list is not initialized, we may getNullPointerExceptionin runtime. 2. UsingArrayList.size() Another way to check if the arraylist contains any element or not, we can check the size of ...