java scjp questions and answers pdf

sure! below is a tutorial that discusses the java scjp (sun certified java programmer) exam, commonly known as the ocajp (oracle certified associate java programmer) exam. this tutorial includes an overview of the exam, sample questions, answers, and code examples to illustrate key concepts.

### introduction to scjp/ocajp

the sun certified java programmer (scjp) certification is designed for java programmers to validate their skills and knowledge of the java programming language. the certification is now referred to as oracle certified associate (ocajp) after oracle acquired sun microsystems.

### exam structure

the ocajp exam covers a variety of topics, including:

1. **java basics**: data types, variables, arrays, access modifiers.
2. **operators**: arithmetic, relational, logical, and assignment operators.
3. **control flow statements**: conditional statements, loops, and branching.
4. **object-oriented programming**: classes, objects, inheritance, polymorphism, encapsulation.
5. **exceptions**: handling exceptions, try-catch blocks, and custom exceptions.
6. **java apis**: understanding of commonly used apis like collections, string, and wrapper classes.

### sample questions and answers

here are some sample questions that you might encounter in the ocajp exam, along with code examples.

#### question 1: what will be the output of the following code?

**answer:** the output will be `7`.
**explanation:** since `x 10` is true, the value of `y` will be `x + 2`, which is `5 + 2 = 7`.

#### question 2: which of the following statements is true?

**options:**
a) the output will be "hello world".
b) the output will be "hello".
c) a compile-time error will occur.
d) a runtime error will occur.

**answer:** b) the output will be "hello".
**explanation:** strings in java are immutable. the `concat` method does not change the original string but returns a new string. since we did not assign the result to `str`, it remains "hello".

#### question 3: what ...

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