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Free 1Z0-830 Exam Questions – 2025 Updated

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Oracle 1Z0-830 Free Exam Questions

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1 / 18

Which of the following statements is correct about a final class?

2 / 18

Given:

java

 

System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1)); System.out.print(Boolean.logicalOr(1 == 1, 2 < 1)); System.out.print(Boolean.logicalXor(1 == 1, 2 < 1)); What is printed?

3 / 18

Given:

java

 

var now = LocalDate.now();

 

var format1 = new DateTimeFormatter(ISO_WEEK_DATE);

var format2 = DateTimeFormatter.ISO_WEEK_DATE;

var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);

var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);

 

System.out.println(now.format(REPLACE_HERE));

Which variable prints 2025-W01-2 (present-day is 12/31/2024)?

4 / 18

Given:

java

 

List integers = List.of(0, 1, 2);

integers.stream()

.peek(System.out::print)

.limit(2)

.forEach(i -> {});

What is the output of the given code fragment?

5 / 18

Given:

java

 

public static void main(String[] args) {

try {

throw new IOException();

} catch (IOException e) {

throw new RuntimeException();

} finally {

throw new ArithmeticException();

}

}

What is the output?

6 / 18

Given:

java

 

var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };

var i = 0;

do {

System.out.print(hauteCouture[i] + " ");

} while (i++ > 0);

What is printed?

7 / 18

Given:

java

 

Optional o1 = Optional.empty();

Optional o2 = Optional.of(1);

Optional o3 = Stream.of(o1, o2)

.filter(Optional::isPresent)

.findAny()

.flatMap(o -> o);

System.out.println(o3.orElse(2));

What is the given code fragment's output?

8 / 18

Given:

java

 

StringBuilder result = Stream.of("a", "b")

.collect(

() -> new StringBuilder("c"),

StringBuilder::append,

(a, b) -> b.append(a)

);

System.out.println(result);

What is the output of the given code fragment?

9 / 18

Given:

java

 

System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1)); System.out.print(Boolean.logicalOr(1 == 1, 2 < 1)); System.out.print(Boolean.logicalXor(1 == 1, 2 < 1)); What is printed?

10 / 18

Given:

java

 

int post = 5;

int pre = 5;

 

int postResult = post++ + 10;

int preResult = ++pre + 10;

 

System.out.println("postResult: " + postResult +

", preResult: " + preResult +

", Final value of post: " + post +

", Final value of pre: " + pre);

What is printed?

11 / 18

Given:

java

 

public class ThisCalls {

public ThisCalls() {

this(true);

}

 

public ThisCalls(boolean flag) {

this();

}

}

Which statement is correct?

12 / 18

Which of the following doesnotexist?

13 / 18

Given:

java

 

try (FileOutputStream fos = new FileOutputStream("t.tmp");

ObjectOutputStream oos = new ObjectOutputStream(fos)) {

fos.write("Today");

fos.writeObject("Today");

oos.write("Today");

oos.writeObject("Today");

} catch (Exception ex) {

// handle exception

}

Which statement compiles?

14 / 18

Given:

java

 

CopyOnWriteArrayList list = new CopyOnWriteArrayList<>();

list.add("A");

list.add("B");

list.add("C");

 

// Writing in one thread

new Thread(() -> {

list.add("D");

System.out.println("Element added: D");

}).start();

 

// Reading in another thread

new Thread(() -> {

for (String element : list) {

System.out.println("Read element: " + element);

}

}).start();

What is printed?

15 / 18

Given:

java

 

Object input = 42;

 

String result = switch (input) {

case String s -> "It's a string with value: " + s;

case Double d -> "It's a double with value: " + d;

case Integer i -> "It's an integer with value: " + i;

};

 

System.out.println(result);

What is printed?

16 / 18

Given:

java

 

String textBlock = """

j \

a \t

v \s

a \

""";

System.out.println(textBlock.length());

What is the output?

17 / 18

Given:

java

 

List abc = List.of("a", "b", "c");

abc.stream()

.forEach(x -> {

x = x.toUpperCase();

});

abc.stream()

.forEach(System.out::print);

What is the output?

18 / 18

What do the following print?

java

 

public class DefaultAndStaticMethods {

public static void main(String[] args) {

WithStaticMethod.print();

}

}

 

interface WithDefaultMethod {

default void print() {

System.out.print("default");

}

}

 

interface WithStaticMethod extends WithDefaultMethod {

static void print() {

System.out.print("static");

}

}

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