![]() Substrings represent an ordered sequence of characters that we can extract from a Java String object. Note: The methods we cover in this article were coded with Java 11. This tutorial provides various code examples and walkthroughs for the built-in Java substring method. When it comes to Java, we have access to a range of string methods that are part of the String class. ![]() ![]() As one of the most widely used data types, strings are often the focus of Java coding interview questions via string manipulation problems, whether that be string reversal, conversion, string splitting, or extracting substrings. The Java String data type uses a sequence of characters (char data types) to store all sorts of text-like data. If any index is negative or if (offset + count) is greater than the size of the specified array, a StringIndexOutOfBoundsException is thrown.Īlso, all constructors of the String class that contain an array in their argument list throw a StringIndexOutOfBoundsException when the specified offset and count arguments are invalid.Robert Johns | Co-author How to Extract a Java Substring String.valueOf(char data, int offset, int count) - Returns the string representation of the specified character array argument.The StringIndexOutOfBoundsException is thrown if any index is negative, the endIndex is greater than the length of the string or the beginIndex is greater than the endIndex. String.substring(int beginIndex, int endIndex) - Returns a substring beginning with the character at the specified index, extending until the character at (endIndex - 1).If the beginIndex is negative or greater than the length of the string, a StringIndexOutOfBoundsException is thrown. String.substring(int beginIndex) - Returns a substring beginning with the character at the specified index.CharSequence.subSequence(int beginIndex, int endIndex) - Returns a new character sequence based on specified arguments.If the specified index does not belong to this range, a StringIndexOutOfBoundsException occurs. String.charAt(int index) - Returns the character at the specified index.Some methods that throw a StringIndexOutOfBoundsException with invalid specified arguments are: Therefore, this exception occurs when the index of a character does not exist in the string. When an attempt is made to access the characters with limits that fall outside the range of the string, the StringIndexOutOfBoundsException is thrown. What Causes StringIndexOutOfBoundsExceptionĪ Java string is a collection of characters which has a range of. ![]() ![]() It can be handled in code using a try-catch block. Since the StringIndexOutOfBoundsException is an unchecked exception, it does not need to be declared in the throws clause of a method or constructor. The StringIndexOutOfBoundsException is an unchecked exception in Java that occurs when an attempt is made to access the character of a string at an index which is either negative or greater than the length of the string.įor some methods of the String class, such as the charAt method, this exception is also thrown when the index is equal to the size of the string. ![]()
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