What is StringUtils.isNoneBlank in Java?

isNoneBlank()

isNoneBlank() is a static method of the StringUtils class that accepts a list of strings and checks that there are no blank strings in the list. The method returns false if at least one of the strings in the given list of strings is considered to be blank.

How to check if a string is blank

If a string satisfies any of the criteria below, then it is considered to be blank:

  1. The length of the string is zero or the string is empty.
  2. The string points to a null reference.
  3. The string contains only whitespace characters.

Note: A character can be classified as a whitespace character with the Character.isWhitespace() method.

How to import StringUtils

StringUtils can be found in the Apache Commons Lang package, which we can add to the Maven project by adding the following dependency to the pom.xml file.

<dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.12.0</version>
</dependency>

For other versions of the commons-lang package, refer to the Maven Repository.

You can import the StringUtils class as follows.

import org.apache.commons.lang3.StringUtils;

Syntax

public static boolean isNoneBlank(final CharSequence... css)

Parameters

  • final CharSequence... cs: the list of character sequences/strings to check.

Return value

This method returns true if none of the strings in the list are blank; otherwise, it returns false.

Code

import org.apache.commons.lang3.StringUtils;
import java.util.Arrays;
public class Main {
    public static void main(String[] args) {
        String[] strings = {"hi", "educative", "indiana\tjones\n"};
        System.out.printf("The output of StringUtils.isNoneBlank() for the strings - %s is %s", Arrays.toString(strings), StringUtils.isNoneBlank(strings));
        System.out.println();
        strings = new String[]{"hi", "educative", "\n\t"};
        System.out.printf("The output of StringUtils.isNoneBlank() for the strings - %s is %s", Arrays.toString(strings), StringUtils.isNoneBlank(strings));
        System.out.println();
        strings = new String[]{"", "educative", "hello"};
        System.out.printf("The output of StringUtils.isNoneBlank() for the strings - %s is %s", Arrays.toString(strings), StringUtils.isNoneBlank(strings));
        System.out.println();
        strings = new String[]{null, "educative", "hello"};
        System.out.printf("The output of StringUtils.isNoneBlank() for the strings - %s is %s", Arrays.toString(strings), StringUtils.isNoneBlank(strings));
        System.out.println();
    }
}

Output

The output of the code will be as follows:

The output of StringUtils.isNoneBlank() for the strings - [hi, educative, indiana	jones
] is true
The output of StringUtils.isNoneBlank() for the strings - [hi, educative, 
	] is false
The output of StringUtils.isNoneBlank() for the strings - [, educative, hello] is false
The output of StringUtils.isNoneBlank() for the strings - [null, educative, hello] is false

Explanation

Example 1

  • strings = ["hi", "educative", "indiana\njones\t"]

The method returns true, as none of the strings are blank.

Example 2

  • strings = ["hi", "educative", "\n\t"]

The method returns false, as one of the strings contains only whitespace characters, which are considered to be blank.

Example 3

  • strings = ["", "educative", "hi"]

The method returns false, as one of the strings is empty, which is considered to be a blank string.

Example 4

  • strings = [null, "educative", "hello"]

The method returns false, as one of the strings points to a null reference, which is considered to be a blank string.

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