Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind Java String contains() 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";3Order
Put the learning moves in the order that makes the concept easiest to apply.
The contains() method checks whether a string contains a sequence of characters.
Definition and Usage
Java String contains() Method
❮ String Methods
Example
String myStr = "Hello";
System.out.println(myStr.contains("Hel")); // true
System.out.println(myStr.contains("e")); // true
System.out.println(myStr.contains("Hi")); // falseDefinition and Usage
The contains() method checks whether a string contains a sequence of characters.
Returns true if the characters exist and false if not.
Syntax
public boolean contains(CharSequence
chars )Parameter Values
| Parameter | Description |
|---|---|
| CharSequence chars | The characters to be searched for |
The CharSequence interface is a readable sequence of char values, found in the java.lang package.
Technical Details
| Returns: | A boolean , indicating whether a sequence of characters exist in the specified string: true - sequence of characters exists false - sequence of characters do not exist |
|---|---|
| Throws: | NullPointerException - if the returned value is null |
| Java Version: | 1.5 |
- true - sequence of characters exists
- false - sequence of characters do not exist