1. UsingArrayList.isEmpty() TheArrayList.isEmpty()method returnstrueif the list contains no elements. In other words, the method returnstrueif the list is empty. ElseisEmpty()method returnsfalse. publicbooleanisEmpty(); In the given example, we first initialized an empty ArrayList and checked...
Java String trim()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("...
Learn tocheck if a directory is empty, or contains any files, in Java using NIO APIs. 1. UsingFiles.list() TheFiles.list(dirPath)returns a lazily populatedStreamof files and directories(non-recursive) in a given path. We can use thestream.findAny()method thatreturns an emptyOptionalif th...
/*Java Program to check if a string is empty or null*/ public class Main { public static void main(String[] args) { String str1 = "Study Tonight"; System.out.println("Entered String is: "+str1); System.out.println("Is the entered string empty or null? "+str1 == null || str...
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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...
if (str3 == null || str3.length() == 0) { System.out.println("str3 is null or empty."); } else { System.out.println("str3 is not null or empty."); } } } The code example demonstrates the if-else method for checking if a string is null or empty in Java. It utilizes ...
String nullString =null; String emptyString =""; String blankString =" "; In this tutorial, we'll look athow to check if a String is Null, Empty or Blank in Java. Using the Length of the String As mentioned before, a string is empty if its length is equal to zero. We will be...
String is numeric! NumberUtils.isCreatable() This method also accepts a String and checks if it's avalid Java number. With this method we can cover even more numbers, because a valid Java number includes even hexadecimal and octal numbers, scientific notation, as well as numbers marked with ...
Let’s begin with a complete working code example to illustrate the concept: publicclassCheckIfIntIsNullExample{publicstaticvoidmain(String[]args){// Part 1: Primitive intintprimitiveInt=0;System.out.println("Primitive int value: "+primitiveInt);// Part 2: Nullable IntegerInteger nullableInt=nu...