Java StringUtils contains() Method

Java StringUtils contains() Method | In this blog, we see how to use StringUtils contains() method in Java. The contains() method checks whether the substring is contained in the main string or not. There are many variations of the StringUtils contains() method as listed below:-

1. contains(CharSequence seq, CharSequence searchSeq)
2. contains(CharSequence seq, int searchChar)
3. containsAny(CharSequence cs, char… searchChars)
4. containsAny(CharSequence cs, CharSequence… searchCharSequences)
5. containsAny(CharSequence cs, CharSequence searchChars)
6. containsAnyIgnoreCase(CharSequence cs, CharSequence… searchCharSequences)
7. containsIgnoreCase(CharSequence str, CharSequence searchStr)
8. containsNone(CharSequence cs, char… searchChars)
9. containsNone(CharSequence cs, String invalidChars)
10. containsOnly(CharSequence cs, char… valid)
11. containsOnly(CharSequence cs, String validChars)

StringUtils Java contains() Method

See the below examples to understand more about the contains() method:-
Example:
String: “Apple”
String-1: “Ap”
Is String contains String1?: true
String2: “abc”
Is String contains String2?: false

Java StringUtils contains() Method Example

The contains(CharSequence seq, CharSequence searchSeq) method checks if CharSequence contains a search CharSequence, handling null. This method uses String#indexOf(String) if possible. A null CharSequence will return false.

The contains(CharSequence seq, int searchChar) method checks if CharSequence contains a search character, handling null. This method uses String#indexOf(int) if possible. A null or empty ("") CharSequence will return false.

import org.apache.commons.lang3.StringUtils;

public class Main {
    public static void main(String[] args) {
        String string = "Banana";
        System.out.println(StringUtils.contains(string, "ana"));
        System.out.println(StringUtils.contains(string, "Hello"));
        System.out.println(StringUtils.contains(string, "H"));
        System.out.println(StringUtils.contains(string, "B"));
    }
}

Output:-

true
false
false
true

import org.apache.commons.lang3.StringUtils;

public class Main {
    public static void main(String[] args) {
        System.out.println(StringUtils.contains(null, "ana"));
        System.out.println(StringUtils.contains("", "Hello"));
        System.out.println(StringUtils.contains("", "H"));
        System.out.println(StringUtils.contains(null, "B"));
    }
}

Output:-

false
false
false
false

Java StringUtils containsIgnoreCase() Method

The containsIgnoreCase(CharSequence str, CharSequence searchStr) method works very similar to the contains() method but it ignores the case of the characters.

import org.apache.commons.lang3.StringUtils;

public class Main {
    public static void main(String[] args) {
        String string = "Banana";
        System.out.println(StringUtils.containsIgnoreCase(string, "ana"));
        System.out.println(StringUtils.containsIgnoreCase(string, "BANA"));
        System.out.println(StringUtils.containsIgnoreCase(string, "A"));
        System.out.println(StringUtils.containsIgnoreCase(string, "B"));
    }
}

Output:-

true
true
true
true

StringUtils Java containsAny() Method

There are three overloaded forms of containsAny() method:-

• public static boolean containsAny(final CharSequence cs, final char… searchChars)
• public static boolean containsAny(final CharSequence cs, final CharSequence searchChars)
• public static boolean containsAny(final CharSequence cs, final CharSequence… searchCharSequences)

The first and second method checks if the CharSequence contains any character in the given set of characters. The third method checks if the CharSequence contains any of the CharSequences in the given array.

For all these containsAny() methods, a null CharSequence will return false. A null CharSequence will return false whereas a null or zero-length search array will return false.

import org.apache.commons.lang3.StringUtils;

public class Main {

    public static void main(String[] args) {
        String string = "Hello, World";
        System.out.println(StringUtils.containsAny(string, 'X', 'Y', 'Z'));
        System.out.println(StringUtils.containsAny(string, 'l', 'B', 'C'));
        
        System.out.println(StringUtils.containsAny(string, "Hi"));
        System.out.println(StringUtils.containsAny(string, "ABC"));
        
        System.out.println(StringUtils.containsAny(string, "Hi", "Hey"));
        System.out.println(StringUtils.containsAny(string, "Hel", "Hey"));
    }
}

Output:-

false
true
true
false
false
true

Java StringUtils containsNone() Method

The containsNone(CharSequence cs, char… searchChars) & containsNone(CharSequence cs, String invalidChars) method checks that the CharSequence does not contain certain characters. A null CharSequence will return true. A null invalid character array will return true. An empty CharSequence (length()=0) always returns true.

The containsNone() method is very opposite to the containsAny() method. Let us see a program for Java StringUtils containsNone() method.

import org.apache.commons.lang3.StringUtils;

public class Main {

    public static void main(String[] args) {
        String string = "Hello, World";
        System.out.println(StringUtils.containsNone(string, 'X', 'Y', 'Z'));
        System.out.println(StringUtils.containsNone(string, 'l', 'B', 'C'));
        
        System.out.println(StringUtils.containsNone(string, "Hi"));
        System.out.println(StringUtils.containsNone(string, "ABC"));
    }
}

Output:-

true
false
false
true

Java StringUtils containsOnly() Method

The containsOnly(CharSequence cs, char… valid) & containsOnly(CharSequence cs, String validChars) methods checks if the CharSequence contains only certain characters.

A null CharSequence will return false. A null valid character array will return false. An empty CharSequence (length()=0) always returns true.

import org.apache.commons.lang3.StringUtils;

public class Main {

    public static void main(String[] args) {
        System.out.println(StringUtils.containsOnly("Hi", 'H', 'i', 'o'));
        System.out.println(StringUtils.containsOnly("Hi", 'H', 'i'));

        System.out.println(StringUtils.containsOnly("Hi", "Hi"));
        System.out.println(StringUtils.containsOnly("Hi", "Hello"));
        System.out.println(StringUtils.containsOnly("Hi", "ABC"));
    }
}

Output:-

true
true
true
false
false

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