Strings receive special treatment in Java, because they are used frequently in a program. isBlank() -> boolean which are unicode white-space aware. strip()|.stripLeading()|.stripTrailing() -> String and. More examples New Methods JDK 9 new methods If you simply need to send a simple formatted string to the console, use (), e.g., For complex string, use StringBuffer/ StringBuilder with a Formatter. String.format() is useful if you need to produce a simple formatted String for some purposes (e.g., used in method toString()). The format() method has the same form as printf(). The static method String.format() (introduced in JDK 5) can be used to produce a formatted String using C-like printf()'s format specifiers. R transform(Function f) // transforms from String to type R (JDK 12) Examples static method String.format() (JDK 5) IntStream chars() // returns a IntStream of characters (JDK 9) ![]() Stream lines() // returns a stream of lines (JDK 11) args) // same as printf() /*** Stream and Functional Programming ***/ Static String format(String formattingString, Object. Static String valueOf( type arg) // type can be primitives or char // Formatting using format specifiers String split(String regex, int count) // for count times only /*** static methods ***/ // Converting primitives to String String split(String regex) // Split the String using regex as delimiter, return a String array String replaceFirst(String regex, String replacement) ![]() String replaceAll(String regex, String replacement) String replace(CharSequence target, CharSequence replacement) // (JDK 4) Static String join(CharSequence delimiter, Iterable elements) // (JDK 8) // Text Processing and Regular Expression (JDK 4) Static String join(CharSequence delimiter, CharSequence. Void getChars(int srcBegin, int srcEnd, char dst, int dstBegin) // copy into dst char // Working with CharSequence (super-interface of String, StringBuffer, StringBuilder)īoolean contains(CharSequence cs) // (JDK 5)īoolean contentEquals(CharSequence cs) // (JDK 5)īoolean contentEquals(StringBuffer sb) // (JDK 4) String indent(int n) // adjusts the indentation by n (JDK 12)Ĭhar toCharArray() // create a char from this string String strip() // strips the leading and trailing white spaces (Unicode aware) (JDK 11) String trim() // creates a new String removing white spaces from front and back String concat(String another) // same as str+another Creating a new String or char from the original - Strings are immutable Extracting a char or substring, include fromIdx but exclude toIdx Int lastIndexOf(String key, int fromIdx) // search backward starting at fromIdx Int indexOf(int char, int fromIdx) // search forward starting at fromIdx Searching: index from 0 to str.length()-1 ![]() Int compareTo(String another) // return 0 if this string is the same as another īoolean startsWith(String another, int fromIdx) // search begins at fromIdx Int length() // returns the length of the Stringīoolean isEmpty() // same as str.length() = 0īoolean isBlank() // contains only white spaces (Unicode aware) (JDK 11) // Comparisonīoolean equals(String another) // CANNOT use '=' or '!=' to compare two Strings in Java Refer to the JDK API for a complete listing. The commonly-used method in the String class are summarized below. For example, the method toUpperCase() constructs and returns a new String instead of modifying the existing content. That is, its content cannot be modified once it is created. '+' does not work on any other objects such as Point and Circle. The '+' operator is overloaded to concatenate two String operands.You can assign a string literal directly into a String variable, instead of calling the constructor to create a String instance. String is associated with string literal in the form of double-quoted texts such as " hello, world".Unlike C/C++, where string is simply an array of char, A Java String is an object of the class. A Java String contains an immutable sequence of Unicode characters.
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