Java String

Java String intern() method returns the canonical representation of the string. When we invoke intern() method on a string, if the string pool already has a string having the same value, then the reference of that string is returned. Otherwise, a new string with the same value is created in the pool and its reference […]

Java String lines() method returns the stream of lines from the string. The lines are separated by line terminators – \n, \r, and \r\n. A line is considered as a sequence of characters followed by a line terminator or end of the string. The line doesn’t include line terminators. The stream contains the lines in

Java String toUpperCase() method converts the string into the upper case. The characters in the string are converted to the upper case using the Locale rules. This method is locale-specific. So the output string can be different based on the locale settings. The toUpperCase() method uses Character class and standard Unicode rules to change the

Java String toLowerCase() method converts the string into the lower case. The characters in the string are converted to the lower case using the Locale rules. This method is locale-specific. So the output string can be different based on the locale settings. The toLowerCase() method uses Character class and standard Unicode rules to change the

Java String trim() method is used to remove all the leading and trailing white spaces from the string. The trim() method returns a new string and the original string remains unchanged. The white space is considered as any character whose Unicode code point is less than or equal to ‘U+0020’ (the space character). If the string

Java String replaceAll() method is used to replace each substring that matches the specified regular expression with the specified replacement string. The replaceAll() and replaceFirst() methods internally uses Matcher class. Both of these methods accepts two arguments – regex string and replacement string. If the regex is invalid, PatternSyntaxException is thrown. The methods were introduced in

Java String replace() method is used to replace part of the string and create a new string object. Since the string is immutable, the original string remains the same. The replace() method returns a new string and we have to assign it to a variable to use it. There are two overloaded replace() methods in

Java String lastIndexOf() method is used to get the last index of a character or a substring in this string. String lastIndexOf() Methods There are four variants of lastIndexOf() methods in the String class. lastIndexOf(int ch): returns the index of the last occurrence of the given character in this string. If the character is not

Java String indexOf() method is used to get the first index of a character or a substring in this string. String indexOf() Methods There are four overloaded indexOf() methods in String class. indexOf(int ch): returns the index of the first occurrence of the given character. If the character is not found, then this method returns

The String join() method is used to join multiple strings, arrays, or Iterable elements to form a new string. We can specify the delimiter string to be used when joining the elements. Java String join() methods are static. These methods got added in String class in Java 1.8 release. The join() method throws NullPointerException if