5/10/2024 0 Comments Java string intern![]() 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)īoolean 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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