Java String indexOf () Method
- Definition and Usage 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.
- Syntax There are 4 indexOf () methods: ...
- Parameter Values
- Technical Details
- More Examples Example ...
How do you use indexOf in Java?
Java String indexOf() Return Value. This indexOf() Java String method returns the index within this string of the first occurrence of the specified character. It returns -1 if the character does not occur. The Java String IndexOf method has four overloads. All the overloads return an integer type value, representing the returned index.
How to find indexOf in a string array in Java?
Java String indexOf () There are four variants of indexOf () method. This article depicts about all of them, as follows: 1.int indexOf () : This method returns the index within this string of the first occurrence of the specified character or -1, if the character does not occur. Syntax: int indexOf (char ch ) Parameters: ch : a character.
What is stringindexoutofboundsexception in Java?
What is the index that is out of range Java? Description. A StringIndexOutOfBoundsException is thrown when a String or StringBuffer object detects an out-of-range index. An out-of-range index occurs when the index is less than zero, or greater than or equal to the length of the string.
What is Override method in Java?
Method overriding in Java. Overriding is the ability to define a behavior that's specific to the subclass type, which means a subclass can implement a parent class method based on its requirement. In object-oriented terms, overriding means to override the functionality of an existing method.
See more
What is int indexOf?
int indexOf (String str, int strt) : This method returns the index within this string of the first occurrence of the specified substring, starting at the specified index. If it does not occur, -1 is returned.
How many variants of indexOf?
There are four variants of indexOf () method. This article depicts about all of them, as follows:#N#1.int indexOf () : This method returns the index within this string of the first occurrence of the specified character or -1, if the character does not occur.
Java String indexOf (String substring) Method Example
The method takes substring as an argument and returns the index of the first character of the substring.
Java String indexOf (String substring, int fromIndex) Method Example
The method takes substring and index as arguments and returns the index of the first character that occurs after the given fromIndex.
Java String indexOf (int char, int fromIndex) Method Example
The method takes char and index as arguments and returns the index of the first character that occurs after the given fromIndex.
What does indexOf do in Java?
That’s where the indexOf () Java method comes in. indexOf () returns the index of a particular character or substring in a string. This tutorial will explore how to use the indexOf () method in Java, with reference to examples.
Where is Strawberry in the index?
Strawberry appears at the index position 11.
How to find substring in Java?
The indexOf () method takes in two parameters: 1 substring is the character or substring whose start index position you want to find (required) 2 start_char is the index position at which the search for the substring should begin (optional)
How does indexof work in Java?
The IndexOf () java method works in a similar way when a substring is provided as a parameter as it works for char values. See the example below which returns the index position of the first occurrence of substring.
What is index of Java?
The indexOf Java method returns the index within the calling String object of the first occurrence of the specified value. It can also take an optional parameter to start the search from the specified position. In this article, we learned about the java IndexOf () method. We covered the basic syntax and learned how we can use the java IndexOf () method to find the position of char or a string value from a string by taking various examples.
What is the required parameter for index of Java?
We already discussed that the IndexOf () java takes one required and one optional parameter. The required parameter can either be a char value or a string value. In this section, we will take examples of both char and a string value as parameters to the IndexOf () java method.
What does indexof return?
All of the above different syntaxes of the Java IndexOf () method return an integer value which will be the first occurrence of specified char/string in the main string.
What is a string in Java?
A Java String is a sequence of characters that exist as an object of the class java. You can read more about strings from the article on Java strings. The indexOf () method is used to get the index of the first occurrence of a specified character/string in the parameter of the IndexOf method of a string. The IndexOf () java method can take one parameter ( char or string) or two parameters as well. The simple syntax of the IndexOf () java method with one parameter looks like this:
What happens if a string is not present in Java?
We already know that if a string/char value is not present in our main string, then the index of the java method will return -1. Let us now use if-else statements to handle this case and print out a valid and meaningful message. You can read more about if-else statements from the article if else java statements . See the example below:
Can you provide the starting index along with a substring?
In a similar way, we can provide the starting index along with a substring and it will return the position of the substring after the specified index. See the example below:
