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38:T4ce,## 1. Correct Answer **C.** 400.0 : 100.0 --- ## 2. Evaluation **A.** 200.0 : 100.0 `prt.price` starts at `200.0`. Inside `updatePrice`, the local parameter `price` becomes `200.0` after doubling, and that value is added to `product.price`, making it `400.0`. `newPrice` remains unchanged at `100.0` because primitives are passed by value. **B.** 400.0 : 200.0 `newPrice` is not modified by the method call, so the second value stays `100.0`. The first value becomes `400.0`, not `200.0`, because the object's field is updated. **C.** 400.0 : 100.0 This is the correct result. The method updates the `Product` object's `price` field from `200.0` to `400.0`, while the local variable `newPrice` remains `100.0`, so the output is `400.0 : 100.0`. **D.** Compilation fails. The code compiles successfully. There is no syntax error or invalid access, and both the object reference and primitive argument are used correctly. --- ## 3. Overall Explanation `product` refers to the same `Product` object as `prt`, so changing `product.price` inside the method changes `prt.price` as well. The primitive parameter `price` is passed by value, so doubling it affects only the local copy. Therefore the output is `400.0 : 100.0`.39:T46c,## 1. Correct Answer **B.** The break statement, at the end of each case block, is optional. --- ## 2. Evaluation **A.** It must contain the default section. False. A `switch` can be valid without a `default` section; `default` is optional. **B.** The break statement, at the end of each case block, is optional. True. `break` at the end of a `case` block is optional; if it is omitted, control falls through to the next `case` or `default` label. **C.** Its case label literals can be changed at runtime. False. `case` label values must be compile-time constants, so they cannot be changed at runtime. **D.** Its expression must evaluate to a collection of values. False. A `switch` expression does not evaluate to a collection; in Java 8 it must be a supported scalar type such as `int`, `char`, `String`, or an enum. --- ## 3. Overall Explanation The only true statement is that `break` at the end of each `case` block is optional. The other choices are incorrect because `default` is not required, `case` labels must be constant, and the `switch` expression must be a supported scalar type rather than a collection.3a:T59f,## 1. Correct Answer **D.** An exception is thrown at runtime. --- ## 2. Evaluation **A.** May 04, 2014T00:00:00.000 `LocalDate.parse("2014-05-04")` succeeds, but `DateTimeFormatter.ISO_DATE_TIME` requires time-based fields such as hour, minute, and second. A `LocalDate` does not support those fields, so formatting it with this formatter throws a runtime exception (`UnsupportedTemporalTypeException`). **B.** 2014-05-04T00:00: 00.000 This looks like the output of a date-time formatter, but it is not valid for `LocalDate` here. The formatter cannot produce a full date-time string from a date-only object, so this string is not printed. **C.** 5/4/14T00:00:00.000 `LocalDate` would format as `2014-05-04` with a date formatter, not as a US-style short date. Also, the code does not reach a successful print result because formatting fails first. **D.** An exception is thrown at runtime. The code compiles, parses the date successfully, and then fails at runtime when `ISO_DATE_TIME` tries to format a `LocalDate` that has no time portion. The expected exception is an `UnsupportedTemporalTypeException`. --- ## 3. Overall Explanation `LocalDate.parse("2014-05-04")` returns a date-only object. Calling `.format(DateTimeFormatter.ISO_DATE_TIME)` on a `LocalDate` is invalid because `ISO_DATE_TIME` expects time information as well. Therefore, the program throws a runtime exception rather than printing a formatted string.3b:T7d6,## 1. Correct Answer **C.** Compilation fails at line n2. --- ## 2. Evaluation **A.** Sum is 600 `line n1` compiles successfully. `s1` is unboxed from `Short` to `short`, then widened to `long` because of `(long) s1`. `s2` is unboxed from `Integer` to `int`, and numeric promotion makes the result of `(long) s1 + s2` a `long`. That `long` is then autoboxed into `Long` for `s3`. **B.** Compilation fails at line n1. `line n1` does **not** cause a compilation error. Java allows unboxing, widening, numeric promotion, and then boxing back into `Long` here. **C.** Compilation fails at line n2. `line n2` fails to compile because `s3 * s2` produces a primitive numeric value (`long` after unboxing and promotion). A primitive `long` cannot be cast to `String`. This is a **compile-time error**, not a runtime exception. **D.** A ClassCastException is thrown at line n1. `line n1` does not throw `ClassCastException`. There is no invalid reference cast there—only numeric operations with unboxing/boxing. **E.** A ClassCastException is thrown at line n2. `line n2` would not reach runtime. The cast to `String` is invalid at compile time because the expression is a primitive numeric result, so Java rejects the code before execution. --- ## 3. Overall Explanation The correct answer is **C**. ### Why `line n1` works ```java Long s3 = (long) s1 + s2; ``` - `s1` is a `Short`, so it is **unboxed** to `short`. - `(long) s1` converts it to `long`. - `s2` is an `Integer`, so it is **unboxed** to `int`. - In the addition, Java applies **binary numeric promotion**, so the result is `long`. - That `long` result is then **autoboxed** into `Long` and assigned to `s3`. So `line n1` is valid. ### Why `line n2` fails ```java String s4 = (String) (s3 * s2); ``` - `s3 * s2` unboxes `Long` and `Integer` to numeric primitives. - The result is a primitive `long`. - A primitive numeric value cannot be cast to `String`. Therefore, the code does **not compile**, and the error is at **line n2**.3c:T47e,

The correct answer is C.

Why `line n1` works

```java
Long s3 = (long) s1 + s2;
```

s1 is a Short, so it is unboxed to short.
(long) s1 converts it to long.
s2 is an Integer, so it is unboxed to int.
In the addition, Java applies binary numeric promotion, so the result is long.
That long result is then autoboxed into Long and assigned to s3.

So line n1 is valid.

Why `line n2` fails

```java
String s4 = (String) (s3 * s2);
```

s3 * s2 unboxes Long and Integer to numeric primitives.
The result is a primitive long.
A primitive numeric value cannot be cast to String.

Therefore, the code does not compile, and the error is at line n2.

3d:T42e,## 1. Correct Answer **A.** Encapsulation --- ## 2. Evaluation **A.** Encapsulation This is the term for bundling data with the methods that operate on it while restricting direct access to the data through access modifiers such as `private` and `public`. **B.** Inheritance This refers to creating a new class from an existing class, not to hiding variables inside a class. **C.** Abstraction This is about exposing only essential features and hiding implementation details, but the specific idea of protecting fields with access modifiers is encapsulation. **D.** Instantiation This means creating an object from a class using `new`; it is not about hiding data. **E.** Polymorphism This describes the ability of the same method or object to take many forms, such as overloading or overriding, not data hiding. --- ## 3. Overall Explanation The Java concept described is **encapsulation**. It is the practice of keeping fields private and controlling access to them through methods, which helps protect the data and hide internal implementation details.31:["$","$L32",null,{"examId":1802,"initialBookmarkedIds":[],"children":["$","$L33",null,{"initialTab":"practice","allowBookmarked":false,"tabResetKey":"implicit","children":[["$","$L34",null,{"className":"mb-6","children":[["$","$L35",null,{"value":"practice","children":"Practice Questions"}],null]}],["$","$L36",null,{"value":"practice","children":[["$","$L37",null,{"questions":[{"id":289361,"sortOrder":1,"type":"multiple_choice","domain":null,"visibility":"full","questionText":"

\n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\tGiven:

What is the result?
\n

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product refers to the same Product object as prt, so changing product.price inside the method changes prt.price as well. The primitive parameter price is passed by value, so doubling it affects only the local copy. Therefore the output is 400.0 : 100.0.

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prt.price starts at 200.0. Inside updatePrice, the local parameter price becomes 200.0 after doubling, and that value is added to product.price, making it 400.0. newPrice remains unchanged at 100.0 because primitives are passed by value.

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newPrice is not modified by the method call, so the second value stays 100.0. The first value becomes 400.0, not 200.0, because the object's field is updated.

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This is the correct result. The method updates the Product object's price field from 200.0 to 400.0, while the local variable newPrice remains 100.0, so the output is 400.0 : 100.0.

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The code compiles successfully. There is no syntax error or invalid access, and both the object reference and primitive argument are used correctly.

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The only true statement is that break at the end of each case block is optional. The other choices are incorrect because default is not required, case labels must be constant, and the switch expression must be a supported scalar type rather than a collection.

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False. A switch can be valid without a default section; default is optional.

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True. break at the end of a case block is optional; if it is omitted, control falls through to the next case or default label.

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False. case label values must be compile-time constants, so they cannot be changed at runtime.

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False. A switch expression does not evaluate to a collection; in Java 8 it must be a supported scalar type such as int, char, String, or an enum.

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\n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\tGiven the code fragment:

What is the result?
\n

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LocalDate.parse(\"2014-05-04\") returns a date-only object. Calling .format(DateTimeFormatter.ISO_DATE_TIME) on a LocalDate is invalid because ISO_DATE_TIME expects time information as well. Therefore, the program throws a runtime exception rather than printing a formatted string.

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LocalDate.parse(\"2014-05-04\") succeeds, but DateTimeFormatter.ISO_DATE_TIME requires time-based fields such as hour, minute, and second. A LocalDate does not support those fields, so formatting it with this formatter throws a runtime exception (UnsupportedTemporalTypeException).

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This looks like the output of a date-time formatter, but it is not valid for LocalDate here. The formatter cannot produce a full date-time string from a date-only object, so this string is not printed.

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LocalDate would format as 2014-05-04 with a date formatter, not as a US-style short date. Also, the code does not reach a successful print result because formatting fails first.

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The code compiles, parses the date successfully, and then fails at runtime when ISO_DATE_TIME tries to format a LocalDate that has no time portion. The expected exception is an UnsupportedTemporalTypeException.

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What is the result?
\n

","questionPreview":null,"options":[{"id":1118235,"position":0,"text":"Sum is 600","imageUrl":null},{"id":1118236,"position":1,"text":"Compilation fails at line n1.","imageUrl":null},{"id":1118237,"position":2,"text":"Compilation fails at line n2.","imageUrl":null},{"id":1118238,"position":3,"text":"A ClassCastException is thrown at line n1.","imageUrl":null},{"id":1118239,"position":4,"text":"A ClassCastException is thrown at line n2.","imageUrl":null}],"correctOptions":[2],"correctAnswerHtml":null,"explanation":"","aiExplanation":"$3b","revealAnswer":{"schemaVersion":"mcq_option_analysis_v1","correctOptionPositions":[2],"isMultiSelect":false,"overallExplanationHtml":"$3c","options":[{"position":0,"label":"A","explanationHtml":"

line n1 compiles successfully. s1 is unboxed from Short to short, then widened to long because of (long) s1. s2 is unboxed from Integer to int, and numeric promotion makes the result of (long) s1 + s2 a long. That long is then autoboxed into Long for s3.

","isCorrect":false},{"position":1,"label":"B","explanationHtml":"

line n1 does not cause a compilation error. Java allows unboxing, widening, numeric promotion, and then boxing back into Long here.

","isCorrect":false},{"position":2,"label":"C","explanationHtml":"

line n2 fails to compile because s3 * s2 produces a primitive numeric value (long after unboxing and promotion). A primitive long cannot be cast to String. This is a compile-time error, not a runtime exception.

","isCorrect":true},{"position":3,"label":"D","explanationHtml":"

line n1 does not throw ClassCastException. There is no invalid reference cast there—only numeric operations with unboxing/boxing.

","isCorrect":false},{"position":4,"label":"E","explanationHtml":"

line n2 would not reach runtime. The cast to String is invalid at compile time because the expression is a primitive numeric result, so Java rejects the code before execution.

","isCorrect":false}]},"images":[{"ext":"png","hash":"bb1627038f254c14","context":"question","assetKey":"images/11dd5100c8b51e9f2ff163ab55ff55274a236d9e29dc1400eea3eecf3793d2cd.png"}]},{"id":289365,"sortOrder":5,"type":"multiple_choice","domain":null,"visibility":"full","questionText":"

\n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\tWhat is the name of the Java concept that uses access modifiers to protect variables and hide them within a class?
\n

","questionPreview":null,"options":[{"id":1118240,"position":0,"text":"Encapsulation","imageUrl":null},{"id":1118241,"position":1,"text":"Inheritance","imageUrl":null},{"id":1118242,"position":2,"text":"Abstraction","imageUrl":null},{"id":1118243,"position":3,"text":"Instantiation","imageUrl":null},{"id":1118244,"position":4,"text":"Polymorphism","imageUrl":null}],"correctOptions":[0],"correctAnswerHtml":null,"explanation":"","aiExplanation":"$3d","revealAnswer":{"schemaVersion":"mcq_option_analysis_v1","correctOptionPositions":[0],"isMultiSelect":false,"overallExplanationHtml":"

The Java concept described is encapsulation. It is the practice of keeping fields private and controlling access to them through methods, which helps protect the data and hide internal implementation details.

","options":[{"position":0,"label":"A","explanationHtml":"

This is the term for bundling data with the methods that operate on it while restricting direct access to the data through access modifiers such as private and public.

","isCorrect":true},{"position":1,"label":"B","explanationHtml":"

This refers to creating a new class from an existing class, not to hiding variables inside a class.

","isCorrect":false},{"position":2,"label":"C","explanationHtml":"

This is about exposing only essential features and hiding implementation details, but the specific idea of protecting fields with access modifiers is encapsulation.

","isCorrect":false},{"position":3,"label":"D","explanationHtml":"

This means creating an object from a class using new; it is not about hiding data.

","isCorrect":false},{"position":4,"label":"E","explanationHtml":"

This describes the ability of the same method or object to take many forms, such as overloading or overriding, not data hiding.

","isCorrect":false}]},"images":null}],"exam":{"id":1802,"code":"1Z0-808","shortcode":"1Z0-808","name":"Java Enterprise Development","slug":"1z0-808","description":"This certification validates practical skills in enterprise business systems, with emphasis on configuring processes, managing information, and supporting business outcomes. It is intended for professionals who implement or operate enterprise business systems.","overviewSource":"baseline","overviewText":null,"overviewHtml":null,"rating":4.9,"updatedAt":"$D2026-08-15T18:53:39.604Z","anonFreeCount":15,"registeredFreeCount":20,"price30DayCents":1999,"price90DayCents":3999,"provider":{"name":"Oracle","slug":"oracle"}},"currentPage":1,"totalPages":41,"isLoggedIn":false,"bookmarkLoginHref":"/auth/login?redirect=%2Fexams%2Foracle%2F1z0-808"}],"$L3e"]}],"$L3f",null]}]}]

Why line n1 works

Why line n2 fails

Why `line n1` works

Why `line n2` fails

Java Enterprise Development

Exam Details

Question Types