Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind Java String indexOf() Method?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Fill blank
Complete the missing token from the example code.
___ myStr = "Hello planet earth, you are a great planet.";3Order
Put the learning moves in the order that makes the concept easiest to apply.
The indexOf() method returns the position of the first occurrence of specified character(s) in a string.
Definition and Usage
Java String indexOf() Method
❮ String Methods
Example
String myStr = "Hello planet earth, you are a great planet.";
System.out.println(myStr.indexOf("planet"));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.
One of the following
public int indexOf(String
str )public int indexOf(String
str , int
fromIndex )public int indexOf(int
char )public int indexOf(int
char , int
fromIndex )Parameter Values
| Parameter | Description |
|---|---|
| str | A String value, representing the string to search for |
| fromIndex | An int value, representing the index position to start the search from |
| char | An int value, representing a single character, e.g 'A', or a Unicode value |
Technical Details
| Returns: | An int value, representing the index of the first occurrence of the character in the string, or -1 if it never occurs |
|---|