Definition and Usage. The indexOf () method returns the position of the first occurrence of a specified value in a string. This method returns -1 if the value to search for never occurs. Note: The indexOf () method is case sensitive. Tip: Also look at the lastIndexOf () method.
The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present. The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
Reports the zero-based index of the first occurrence of the specified string in the current String object. A parameter specifies the type of search to use for the specified string. IndexOf (Char, StringComparison) Reports the zero-based index of the first occurrence of the specified Unicode character in this string.
The indexOf () method returns the position of the first occurrence of specified character (s) in a string. Tip: Use the lastIndexOf method to return the position of the last occurrence of specified character (s) in a string.
Java String indexOf() The java string indexOf() method returns index of given character value or substring. If it is not found, it returns -1. The index counter starts from zero. Internal implementation
Browser compatibility. See also. Related topics. The indexOf () method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex. Returns -1 if the value is not found.
12/22/2020 · Description. Locates a character or String within another String. By default, searches from the beginning of the String, but can also start from a given index, allowing for the locating of all instances of the character or String.
indexOf() trong Java - Học Java cơ bản và nâng cao cho người mới học về Ngôn ngữ hướng đối tượng, Ví dụ Java, Phương thức, Ghi đè, Tính kế thừa, Tính trừu tượng, Tính đa hình, Overriding, Inheritance, Polymorphism, Interfaces, Packages, Collections, Lập trình mạng, Đa luồng, Tuần tự hóa, Networking, Multithreading, Generics, Multimedia, Serialization, GUI.
IndexOf (String, Int32, Int32) 回報這個執行個體中指定之字串第一次出現時的所在索引 (以零為起始)。. Reports the zero-based index of the first occurrence of the specified string in this instance. 搜尋從指定的字元位置開始，並檢視指定數目的字元位置。. The search starts at a specified character position and examines a specified number of character positions.
indexOf() 方法可返回某个指定的字符串值在字符串中首次出现的位置。 语法 stringObject.indexOf(searchvalue,fromindex)