What is the StringUtils.isMixedCase in Java?

How to import `StringUtils`?

StringUtils is defined in the Apache Commons Lang package. Apache Commons Lang can be added 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 isMixedCase(final CharSequence cs)

Parameters

final CharSequence cs: the character sequence/string to be checked

Return value

This method returns true if the string contains both uppercase and lowercase characters. Otherwise, it returns false.

Code


import org.apache.commons.lang3.StringUtils;
public class Main {
    public static void main(String[] args) {
        String s = "educATIve";
        System.out.printf("The output of StringUtils.isMixedCase() for the string - '%s' is %s", s, StringUtils.isMixedCase(s));
        System.out.println();
        s = "educ ATIve";
        System.out.printf("The output of StringUtils.isMixedCase() for the string - '%s' is %s", s, StringUtils.isMixedCase(s));
        System.out.println();
        s = "23asfg";
        System.out.printf("The output of StringUtils.isMixedCase() for the string - '%s' is %s", s, StringUtils.isMixedCase(s));
        System.out.println();
        s = "";
        System.out.printf("The output of StringUtils.isMixedCase() for the string - '%s' is %s", s, StringUtils.isMixedCase(s));
        System.out.println();
        s = null;
        System.out.printf("The output of StringUtils.isMixedCase() for the string - '%s' is %s", s, StringUtils.isMixedCase(s));
        System.out.println();
        s = "  ";
        System.out.printf("The output of StringUtils.isMixedCase() for the string - '%s' is %s", s, StringUtils.isMixedCase(s));
        System.out.println();
        s = "\u002f\u0045";
        System.out.printf("The output of StringUtils.isMixedCase() for the string - '%s' is %s", s, StringUtils.isMixedCase(s));
        System.out.println();
        s = "educative";
        System.out.printf("The output of StringUtils.isMixedCase() for the string - '%s' is %s", s, StringUtils.isMixedCase(s));
        System.out.println();
        s = "EDUCATIVE";
        System.out.printf("The output of StringUtils.isMixedCase() for the string - '%s' is %s", s, StringUtils.isMixedCase(s));
        System.out.println();
    }
}

Example 1

string - "educATIve"

The method returns true because the string contains both uppercase and lowercase characters.

Example 2

string - "educ ATIve"

The method returns true because the string contains both uppercase and lowercase characters.

Example 3

string - "23asfg"

The method returns false because the string only contains lowercase characters and numbers.

Example 4

string - ""

The method returns false because the string is empty.

Example 5

string - null

The method returns false because the string points to null reference.

Example 6

string - " "

The method returns false because the string contains only spaces that are neither uppercase nor lowercase characters.

Example 7

string - "\u002f\u0045"

The method returns false because the string contains Unicode letters which are neither uppercase nor lowercase characters.

Example 8

string - "educative"

The method returns false because the string contains lowercase characters only.

Example 9

string - "EDUCATIVE"

The method returns false because the string contains uppercase characters only.

Output

The output of the code will be as follows:

The output of StringUtils.isMixedCase() for the string - 'educATIve' is true
The output of StringUtils.isMixedCase() for the string - 'educ ATIve' is true
The output of StringUtils.isMixedCase() for the string - '23asfg' is false
The output of StringUtils.isMixedCase() for the string - '' is false
The output of StringUtils.isMixedCase() for the string - 'null' is false
The output of StringUtils.isMixedCase() for the string - '  ' is false
The output of StringUtils.isMixedCase() for the string - '/E' is false
The output of StringUtils.isMixedCase() for the string - 'educative' is false
The output of StringUtils.isMixedCase() for the string - 'EDUCATIVE' is false

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