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...
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 Java String Methods Every Developer Should Know ...
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 ...
publicclassCheckIfIntIsNullExample{publicstaticvoidmain(String[]args){// Part 1: Primitive intintprimitiveInt=0;System.out.println("Primitive int value: "+primitiveInt);// Part 2: Nullable IntegerInteger nullableInt=null;System.out.println("Nullable Integer value: "+nullableInt);// Part 3: ...
Collections.emptyList()而不是null check? 在Java中,Collections.emptyList()返回一个空的List对象,因此它不是null,而是一个空列表。与null检查相比,这种方法的优点是它不会抛出NullPointerException异常,而是返回一个空列表。因此,如果您需要检查一个列表是否为空,则可以使用以下代码: 代码语言:txt 复制 if (list...
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...
import java.util.Objects; public class Main { public static void main(String[] args) { List<Integer> x = List.of(1, 2, 3, 4, 5); List<Integer> y = List.of(1, 2, 3, 4, 5); boolean isEqual = Objects.equals(x, y); // null-safe if (isEqual) { System.out.println("Bot...