java se 8 certification questions

certainly! the java se 8 certification, officially known as the oracle certified professional, java se 8 programmer, is a widely recognized certification that demonstrates a developer's proficiency in java programming. preparing for this certification involves understanding java se 8 features, apis, and best practices. below, i’ll provide an overview of key concepts, common question types, and code examples to help you prepare.

### key topics for java se 8 certification

1. **java basics**
- data types, variables, arrays
- operators and control statements
- strings and stringbuilder

2. **object-oriented programming (oop)**
- classes, objects, inheritance, polymorphism, encapsulation
- abstract classes and interfaces

3. **java collections framework**
- lists, sets, maps, and their implementations
- iterators, streams, and lambda expressions

4. **java streams and lambda expressions**
- functional programming concepts
- using streams for data manipulation

5. **exception handling**
- try-catch blocks, multi-catch, and custom exceptions
- the `throws` keyword and try-with-resources

6. **java i/o**
- file i/o with nio.2
- serialization and deserialization

7. **concurrency**
- threads and runnable interface
- synchronization and concurrent collections

8. **java 8 features**
- default methods in interfaces
- optional class

### common question types

1. **multiple choice questions**
these questions typically cover syntax, concepts, or best practices. for example:
- what is the output of a given code snippet?
- which of the following statements are true regarding inheritance?

2. **code completion**
you may be given a partial code snippet that you need to complete.

3. **code analysis**
analyze a piece of code to determine its output or identify errors.

### sample questions with code examples

#### example 1: lambda expression

**question: what will be th ...

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