Free 1Z0-830 Practice Test Questions and Answers (2026) | Cert Empire

A. forEach()

B. collect(Collectors.toList())

C. parallelStream()

D. stream()

A. Modules can access all public classes from any other module by default.

B. Modules require explicit declaration of dependencies on other modules.

C. Reflection can be used to bypass module boundaries and access private members.

D. Services and providers are not related to the modular system in Java.

A. java List numbers = Arrays.asList(10, 5, 20, 1); int max = numbers.stream().filter(n -> n > 10).findFirst().get(); (**Incorrect - Filters then finds first**)

B. java List numbers = Arrays.asList(10, 5, 20, 1); int max = numbers.stream().max(Integer::compareTo).get(); (**Incorrect - max with Comparator, not reduction**

C. java List numbers = Arrays.asList(10, 5, 20, 1); int max = numbers.stream().reduce(Integer::max).get();

D. ```java List numbers = Arrays.asList(10, 5, 20, 1); Optional max = numbers.stream().max(Integer::compareTo); (Incorrect - Optional without get() for reduction)

A. for loop

B. while loop

C. Iterator#next()

D. Stream#forEachParallel()

A. System.out.println()

B. FileOutputStream

C. PrintStream

D. BufferedReader

A. To define methods for manipulating date-time objects.

B. To provide a mechanism for querying specific information from temporal objects

C. To represent different calendar systems.

D. To define a standard way to format date-time objects.

A. java List names = Arrays.asList("Alice", "Bob", "Charlie"); String allNames = names.stream().collect(Collectors.joining(","));

B. java List names = Arrays.asList("Alice", "Bob", "Charlie"); StringBuilder sb = new StringBuilder(); names.stream().forEach(n -> sb.append(n + ",")); String allNames = sb.toString().substring(0, sb.length() - 1); (**Incorrect - Manual concatenation with forEach** 11/97

C. java List names = Arrays.asList("Alice", "Bob", "Charlie"); String allNames = ""; names.stream().forEach(n -> allNames += n + ","); (**Incorrect - Manual concatenation with forEach, inefficient string manipulation**)

D. ```java List names = Arrays.asList("Alice", null, "Charlie"); (Incorrect - Fails with null value in stream) String allNames = names.stream().collect(Collectors.joining(","));

A. ```java fruits.addFirst("Apple"); 5/97

B. ```java fruits.set(fruits.size(), "Apple");

C. ```java fruits.addLast("Apple");

D. ```java fruits.append("Apple"); // This method doesn't exist in LinkedList

A. Creates a runtime image for a Java application.

B. Analyzes dependencies between modules and classes.

C. Generates documentation for Java code.

D. Compiles Java source code into bytecode.

A. To define a set of static helper methods.

B. To provide a callback mechanism for lambda expressions.

C. To enforce specific naming conventions for methods.

D. To restrict access to methods within an interface.