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in java, checking if a string contains a specific sequence of characters can be done using the string class's `contains()` method. this method is straightforward to use and provides a simple way to determine if one string is a substring of another.

overview of the `contains()` method

**signature**: `boolean contains(charsequence sequence)`
**parameters**:
`sequence`: this is the sequence of characters you want to check for in the string. it can be a string or any object that implements the `charsequence` interface.

**return value**:
returns `true` if the specified sequence of characters is found in the string, and `false` otherwise.

example code

here's a simple example demonstrating how to use the `contains()` method in java:



output

when you run the above program, it will produce the following output:



explanation of the code

1. **string declaration**: we declare a string `mainstring` that contains a sentence about java.
2. **substring definition**: we define two substrings, `substring1` which is present in `mainstring`, and `substring2` which is not.
3. **using `contains()` method**: we call the `contains()` method on `mainstring` with `substring1` and `substring2` as arguments and store the results in `contains1` and `contains2`, respectively.
4. **output results**: finally, we print the results to the console.

important points

the `contains()` method is case-sensitive. for example, `"java".contains("java")` will return `false`.
if the sequence to search for is `null`, it will throw a `nullpointerexception`.
`contains()` is a simple and effective way to check for substrings, but for more complex searching (like regex patterns), you might want to consider using `pattern` and `matcher` classes.

conclusion

the `contains()` method is a powerful tool for substring search in java, making it easy to determine if a given sequence exists within a string. this functionality can be widely used in various applica ...

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