Remove a prefix from a String in Java

This post will discuss how to remove a prefix from a string in Java.

1. Using `String.substring()` method

The standard solution is to make use of the substring() method of the String class, as shown below:

class Main

{

public static String removePrefix(String s, String prefix)

{

if (s != null && prefix != null && s.startsWith(prefix)) {

return s.substring(prefix.length());

}

return s;

}

public static void main(String[] args)

{

String s = "supernatural";

System.out.println(removePrefix(s, "super"));

}

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Output:

natural

2. Using `String.split()` method

Another plausible way is to split the given string around the given prefix using the split() method of the String class and return the second string value of the array.

class Main

{

public static String removePrefix(String s, String prefix)

{

if (s != null && s.startsWith(prefix)) {

return s.split(prefix, 2)[1];

}

return s;

}

public static void main(String[] args)

{

String s = "supernatural";

System.out.println(removePrefix(s, "super"));

}

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Output:

natural

3. Using Apache Commons Lang

We can also use the Apache Commons Lang library, which has the removeStart() utility method in the StringUtils class, which does the job and handles NullPointerException.

import org.apache.commons.lang3.StringUtils;

class Main

{

public static String removePrefix(String s, String prefix) {

return StringUtils.removeStart(s, prefix);

}

public static void main(String[] args)

{

String s = "supernatural";

System.out.println(removePrefix(s, "super"));

}

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That’s all about removing a prefix from a Java String.

Remove a prefix from a String in Java

1. Using String.substring() method

2. Using String.split() method

3. Using Apache Commons Lang

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1. Using `String.substring()` method

2. Using `String.split()` method