Java String

Java String to int conversion can be done using the Integer wrapper class. There are two static methods for this purpose – parseInt() and valueOf(). Java String to int Conversion Methods The Integer class provides 5 overloaded methods for the string to int conversion. parseInt(String s): parses the string as a signed decimal value. The […]

Java integer to string conversion is a very simple task. There are various ways to convert an integer to string in Java. Convert using Integer.toString(int i) Convert using String.valueOf(int i) Convert using Integer constructor, deprecated in Java 9. Convert using String.format() method Convert using String concatenation Convert using StringBuffer and StringBuilder classes Convert using DecimalFormat

Java String valueOf() method is used to get the string representation of the argument. There are various overloaded valueOf() methods that accept primitive data types, char array, and object. The String valueOf() methods are static. Java String valueOf() Methods If you look at the String class, there are 9 valueOf() methods. valueOf(boolean b): returns “true”

Java String repeat() method returns a new string whose value is the concatenation of this string given number of times. Java String repeat(int count) Important Points If the count is 0, the empty string is returned. If the count is negative, IllegalArgumentException is thrown. If the count is 1, the reference to this string is

Java String subSequence() method returns a character subsequence from this string. This method is added to String class so that it can implement CharSequence interface. The subSequence() method internally calls substring() method. We can explicitly cast the returned CharSequence to a String object. It throws StringIndexOutOfBoundsException if the index values are invalid. String subSequence() Method

Java String class has two substring methods – substring(int beginIndex) and substring(int beginIndex, int endIndex). These methods return the substring from this string. If the index values are invalid, StringIndexOutOfBoundsException is thrown. The original string remains unchanged because strings are immutable in Java. Java String substring() methods call Arrays.copyOfRange() method, which further calls System.arraycopy() method. String

Java String indent() method is used to indent every line in the string and normalize the newline characters. This method was added to String class in Java 12 release. Working of String indent(int n) Method The string is divided into lines using the lines() method. Each line is then indented based on the indentation value.

Java String isBlank() method returns true if the string is empty or contains only white spaces codepoints. This utility method was added to String class in Java 11 release. White Space Unicode Code Points in Java Java considers the following characters as white space. Note that this is not an extensive list and there are

Java String matches(regex) method is used to test if the string matches the given regular expression or not. String matches() method internally calls Pattern.matches() method. This method returns a boolean value. If the regex matches the string, it returns “true”, otherwise “false”. If the regex pattern is invalid, PatternSyntaxException is thrown. Java String matches() Method

A String is made up of characters. Every character is represented by a Unicode code point value. Java String code point methods allow us to get the Unicode code points of its characters. There are 4 methods in String class related to code points. Java String Code Point Methods Here is the list of 4