$show=/label

Java 11 String API isBlank() Method Example

SHARE:

Quick guide to java 11 new string isblank() method explained with examples. isBlank() method checks if the string is empty or having only white spaces.

1. isBlank Method Overview

In this tutorial, We'll learn about new java 11 string isBlank() method and explanation with examples. And also how to check the string is blank or not using isBlank() method.

This method is introduced in Java 11.
Read complete article on What is new in Java 11 String API.

Java 11 String API isBlank() Method Example

Syntax

 

public boolean isBlank()


Basically, isBlank() method returns true if the string is empty or contains only white space codepoints, otherwise false.

String API has another method isEmpty() which also checks the string is empty or not.

2. isBlank Method examples


Let us write a program to check the given string is empty or not.

2.1 isBlank() Example 1

 

Refer the below program. Created input string with contents "java-w3schools" and it is not blank. Now this method should return false.

String input = "java-w3schools";
boolean isBlank = input.isBlank();
System.out.println(isBlank);

Output:

Compile this program and see the output below.

false

2.2 isBlank Example 2

 

Let us take blank "" input string now . This method should return true now.

String input2 = "";
isBlank = input2.isBlank();
System.out.println(isBlank);

Output:

true


2.3 Multiple white spaces example

 

Created another string with 3 white spaces like "   ". Now see what would be output of isBlank() method.

String input3 = "   ";
isBlank = input3.isBlank();
System.out.println(isBlank);

Output:

true

2.4 All isBlank Example at one place


// 1. Empty
String java11Str1 = "";
System.out.println("java11 string 1 is blank :: " + java11Str1.isBlank());

//2. Single white space
String java11Str2 = " ";
System.out.println("java11 string 2 is blank :: " + java11Str2.isBlank());

//3. Multiple white spaces
String java11Str3 = "   ";
System.out.println("java11 string 3 is blank :: " + java11Str3.isBlank());

//4. With value
String java11Str4 = "hello";
System.out.println("java11 string 4 is blank :: " + java11Str4.isBlank());

Output:

java11 string 1 is blank :: true
java11 string 2 is blank :: true
java11 string 3 is blank :: true
java11 string 4 is blank :: false

3. Internal Implementation

Below is the internal code of isBlank() method. Internally it passes each character to Character.isWhitespace(int) method to check it is blank or not.

public boolean isBlank() {
    return indexOfNonWhitespace() == length();
}

private int indexOfNonWhitespace() {
    return isLatin1() ? StringLatin1.indexOfNonWhitespace(value)
                      : StringUTF16.indexOfNonWhitespace(value);
}


4. Conclusion

In this tutorial, We've seen how to use isBlank() method to check the string is blank or not.

And also seen example programs and what happens if input string has only white spaces (can be multiple).

Example code snippets shown in this article is available on GitHub.

COMMENTS

BLOGGER

About Us

Author: Venkatesh - I love to learn and share the technical stuff.
Name

accumulo,1,ActiveMQ,2,Adsense,1,API,31,ArrayList,16,Arrays,2,Bean Creation,3,Bean Scopes,1,BiConsumer,1,Blogger Tips,1,Books,1,C Programming,1,Collection,4,Collections,20,Collector,1,Command Line,1,Compile Errors,1,Configurations,7,Constants,1,Control Statements,8,Conversions,5,Core Java,71,Corona India,1,Create,2,CSS,1,Date,2,Date Time API,3,Dictionary,1,Difference,1,Download,1,Eclipse,2,Efficiently,1,Error,1,Errors,1,Exception,1,Exceptions,2,Fast,1,Files,9,Float,1,Font,1,For examples,1,For loop examples,1,For Loop in Java,1,Form,1,Freshers,1,Function,3,Functional Interface,2,Garbage Collector,1,Generics,4,Git,4,Grant,1,Grep,1,HashMap,1,HTML,2,HttpClient,2,Immutable,1,Inner for loops,1,Installation,1,Interview Questions,5,Iterate,2,Jackson API,3,Java,28,Java 10,1,Java 11,5,Java 12,5,Java 13,2,Java 14,2,java 5 For loop,1,Java 8,47,Java 9,1,Java Design Patterns,1,Java Files,1,Java for loop,1,Java Program,2,Java Programs,65,java.lang,5,java.util. function,1,jQuery,1,Kotlin,10,Kotlin Programs,6,Lambda,1,lang,29,Leap Year,1,live updates,1,Math,1,Maven,1,Method References,1,Mockito,1,MongoDB,3,Nested for loop,1,Nested for loop examples,1,New Features,1,Operations,1,Optional,4,Oracle,5,Oracle 18C,1,Partition,1,Patterns,1,Programs,1,Property,1,Python,2,Quarkus,1,Read,1,Real Time,1,Recursion,2,Remove,2,Rest API,1,Schedules,1,Serialization,1,Servlet,1,Softwares,1,Sorting Techniques,8,Spring,2,Spring Boot,23,Spring Email,1,Spring MVC,1,Stream,2,Streams,11,String,48,String Programs,8,String Revese,1,Swing,1,System,1,Tags,1,Threads,7,Tomcat,1,Tomcat 8,1,Troubleshoot,16,Unix,2,Updates,3,util,5,While Loop,1,
ltr
item
JavaProgramTo.com: Java 11 String API isBlank() Method Example
Java 11 String API isBlank() Method Example
Quick guide to java 11 new string isblank() method explained with examples. isBlank() method checks if the string is empty or having only white spaces.
https://1.bp.blogspot.com/-5qxBlgsAHlk/XO0SM1hlZNI/AAAAAAAABkw/h_6eRBjJk8osyTppnj_DFrG0DAOui7w-gCLcBGAs/s320/Java%2B11%2BString%2BAPI%2BisBlank%2528%2529%2BMethod%2BExample.PNG
https://1.bp.blogspot.com/-5qxBlgsAHlk/XO0SM1hlZNI/AAAAAAAABkw/h_6eRBjJk8osyTppnj_DFrG0DAOui7w-gCLcBGAs/s72-c/Java%2B11%2BString%2BAPI%2BisBlank%2528%2529%2BMethod%2BExample.PNG
JavaProgramTo.com
https://www.javaprogramto.com/2019/05/java-11-string-isblank.html
https://www.javaprogramto.com/
https://www.javaprogramto.com/
https://www.javaprogramto.com/2019/05/java-11-string-isblank.html
true
3124782013468838591
UTF-8
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS PREMIUM CONTENT IS LOCKED STEP 1: Share to a social network STEP 2: Click the link on your social network Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy Table of Content