Pass Your Java SE 1z1-809 Exam on Dec 13, 2025 with 209 Questions
1z1-809 Free Exam Study Guide! (Updated 209 Questions)
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To prepare for the 1z0-809 exam, candidates are recommended to have hands-on experience in programming with Java SE 8. They should also have a thorough understanding of the topics covered in the exam by studying the exam objectives and using study materials provided by Oracle or other reputable sources. Additionally, taking practice exams can help candidates identify areas where they need to improve and build their confidence before taking the actual exam.
NEW QUESTION # 119
Given the code fragment:
List<Double> doubles = Arrays.asList (100.12, 200.32);
DoubleFunction funD = d -> d + 100.0;
doubles.stream (). forEach (funD); // line n1
doubles.stream(). forEach(e -> System.out.println(e)); // line n2
What is the result?
- A. 200.12300.32
- B. A compilation error occurs at line n2.
- C. A compilation error occurs at line n1.
- D. 100.12200.32
Answer: B
Explanation:
NEW QUESTION # 120
Given:
What is the result?
- A. Compilation fails.
- B. 0
- C. 1
- D. 2
- E. 3
Answer: B
NEW QUESTION # 121
Given the code fragment:
What is the result?
- A. Val:10 Val:20 Val:30
- B. A compilation error occurs.
- C. Val:20 Val:40 Val:60
- D. Val: Val: Val:
Answer: C
NEW QUESTION # 122
Given the code fragment:
List<Integer> nums = Arrays.asList (10, 20, 8):
System.out.println (
//line n1
);
Which code fragment must be inserted at line n1 to enable the code to print the maximum number in the nums
list?
- A. nums.stream().max()
- B. nums.stream().max(Integer : : max).get()
- C. nums.stream().max(Comparator.comparing(a -> a)).get()
- D. nums.stream().map(a -> a).max()
Answer: C
NEW QUESTION # 123
Given:
public class SampleClass {
public static void main(String[] args) {
AnotherSampleClass asc = new AnotherSampleClass(); SampleClass sc = new SampleClass(); sc = asc; System.out.println("sc: " + sc.getClass()); System.out.println("asc: " + asc.getClass());
}}
class AnotherSampleClass extends SampleClass {
}
What is the result?
- A. sc: class Object
asc: class AnotherSampleClass - B. sc: class AnotherSampleClass
asc: class AnotherSampleClass - C. sc: class SampleClass
asc: class AnotherSampleClass - D. sc: class AnotherSampleClass
asc: class SampleClass
Answer: B
NEW QUESTION # 124
Given the Greetings.propertiesfile, containing:
and given:
What is the result?
- A. Goodbye everyone!
- B. Compilation fails.
- C. HELLO_MSG
- D. GOODBY_MSG
- E. Hello, everyone!
Answer: B
NEW QUESTION # 125
Given the code fragment:
Map<Integer, String> books = new TreeMap<>();
books.put (1007, "A");
books.put (1002, "C");
books.put (1001, "B");
books.put (1003, "B");
System.out.println (books);
What is the result?
- A. {1007 = A, 1001 = B, 1003 = B, 1002 = C}
- B. {1007 = A, 1002 = C, 1001 = B, 1003 = B}
- C. {1001 = B, 1002 = C, 1003 = B, 1007 = A}
- D. {1002 = C, 1003 = B, 1007 = A}
Answer: C
Explanation:
References:
NEW QUESTION # 126
Given the code fragment:
Path path1 = Paths.get("/app/./sys/");
Path res1 = path1.resolve("log");
Path path2 = Paths.get("/server/exe/");
Path res1 = path1.resolve("/readme/");
System.out.println(res1);
System.out.println(res2);
What is the result?
- A. /app/sys/log
/readme/server/exe - B. /app/log/sys
/ server/exe/readme - C. /app/./sys/log
/ server/exe/readme - D. /app/./sys/log
/ readme
Answer: D
NEW QUESTION # 127
Given the code fragment:
Which should be inserted into line n1to print Average = 2.5?
- A. DoubleStream str = Stream.of (1.0, 2.0, 3.0, 4.0);
- B. IntStream str = Stream.of (1, 2, 3, 4);
- C. Stream str = Stream.of (1, 2, 3, 4);
- D. IntStream str = IntStream.of (1, 2, 3, 4);
Answer: A
NEW QUESTION # 128
Given the definition of the Country class:
public class country {
public enum Continent {ASIA, EUROPE}
String name;
Continent region;
public Country (String na, Continent reg) {
name = na, region = reg;
}
public String getName () {return name;}
public Continent getRegion () {return region;}
}
and the code fragment:
List<Country> couList = Arrays.asList (
new Country ("Japan", Country.Continent.ASIA),
new Country ("Italy", Country.Continent.EUROPE),
new Country ("Germany", Country.Continent.EUROPE));
Map<Country.Continent, List<String>> regionNames = couList.stream ()
.collect(Collectors.groupingBy (Country ::getRegion,
Collectors.mapping(Country::getName, Collectors.toList()))));
System.out.println(regionNames);
What is the output?
- A. {EUROPE = [Germany], EUROPE = [Italy], ASIA = [Japan]}
- B. {EUROPE = [Italy, Germany], ASIA = [Japan]}
- C. {EUROPE = [Germany, Italy], ASIA = [Japan]}
- D. {ASIA = [Japan], EUROPE = [Italy, Germany]}
Answer: D
NEW QUESTION # 129
Given the code fragments:
class Caller implements Callable<String> {
String str;
public Caller (String s) {this.str=s;}
public String call()throws Exception { return str.concat ("Caller");}
}
class Runner implements Runnable {
String str;
public Runner (String s) {this.str=s;}
public void run () { System.out.println (str.concat ("Runner"));}
}
and
public static void main (String[] args) InterruptedException, ExecutionException { ExecutorService es = Executors.newFixedThreadPool(2); Future f1 = es.submit (new Caller ("Call")); Future f2 = es.submit (new Runner ("Run")); String str1 = (String) f1.get(); String str2 = (String) f2.get();//line n1 System.out.println(str1+ ":" + str2);
}
What is the result?
- A. The program terminates after printing:Run RunnerCall Caller : Run
- B. A compilation error occurs at line n1.
- C. The program prints:Run RunnerCall Caller : nullAnd the program does not terminate.
- D. An Execution is thrown at run time.
Answer: C
NEW QUESTION # 130
Given the code fragments:
and
What is the result?
- A. A compilation error occurs at line n2.
- B. A compilation error occurs at line n1.
- C. The program prints Run... and throws an exception.
- D. Run...Call...
Answer: D
NEW QUESTION # 131
Given the code fragment:
Path file = Paths.get ("courses.txt");
// line n1
Assume the courses.txt is accessible.
Which code fragment can be inserted at line n1 to enable the code to print the content of the courses.txt file?
- A. List<String> fc = Files.list(file);
fc.stream().forEach (s - > System.out.println(s)); - B. List<String> fc = readAllLines(file);
fc.stream().forEach (s - > System.out.println(s)); - C. Stream<String> fc = Files.lines (file);
fc.forEach (s - > System.out.println(s)); - D. Stream<String> fc = Files.readAllLines (file); fc.forEach (s - > System.out.println(s));
Answer: C
NEW QUESTION # 132
Given the definition of the Country class:
public class country {
public enum Continent {ASIA, EUROPE}
String name;
Continent region;
public Country (String na, Continent reg) {
name = na, region = reg;
}
public String getName () {return name;}
public Continent getRegion () {return region;}
}
and the code fragment:
List<Country> couList = Arrays.asList (
new Country ("Japan", Country.Continent.ASIA),
new Country ("Italy", Country.Continent.EUROPE),
new Country ("Germany", Country.Continent.EUROPE));
Map<Country.Continent, List<String>> regionNames = couList.stream ()
.collect(Collectors.groupingBy (Country ::getRegion,
Collectors.mapping(Country::getName, Collectors.toList()))));
System.out.println(regionNames);
- A. {EUROPE = [Germany], EUROPE = [Italy], ASIA = [Japan]}
- B. {EUROPE = [Italy, Germany], ASIA = [Japan]}
- C. {EUROPE = [Germany, Italy], ASIA = [Japan]}
- D. {ASIA = [Japan], EUROPE = [Italy, Germany]}
Answer: D
NEW QUESTION # 133
Given the for loop construct:
for ( expr1 ; expr2 ; expr3 ) {
statement;
}
Which two statements are true?
- A. The expression expr3 must be present. It is evaluated after each iteration through the loop.
- B. When expr2 evaluates to false, the loop terminates. It is evaluated only after each iteration through the loop.
- C. This is not the only valid for loop construct; there exits another form of for loop constructor.
- D. The expression expr1 is optional. it initializes the loop and is evaluated once, as the loop begin.
Answer: B,D
Explanation:
The for statement have this forms:
for (init-stmt; condition; next-stmt) {
body
}
There are three clauses in the for statement.
The init-stmt statement is done before the loop is started, usually to initialize an iteration variable.
The condition expression is tested before each time the loop is done. The loop isn't executed if the boolean expression is false (the same as the while loop). The next-stmt statement is done after the body is executed. It typically increments an iteration variable.
NEW QUESTION # 134
Given the code fragment:
Which should be inserted into line n1to print Average = 2.5?
- A. DoubleStream str = Stream.of (1.0, 2.0, 3.0, 4.0);
- B. IntStream str = Stream.of (1, 2, 3, 4);
- C. Stream str = Stream.of (1, 2, 3, 4);
- D. IntStream str = IntStream.of (1, 2, 3, 4);
Answer: A
NEW QUESTION # 135
Given the definition of the Country class:
public class country {
public enum Continent {ASIA, EUROPE}
String name;
Continent region;
public Country (String na, Continent reg) {
name = na, region = reg;
}
public String getName () {return name;}
public Continent getRegion () {return region;}
}
and the code fragment:
List<Country> couList = Arrays.asList (
new Country ("Japan", Country.Continent.ASIA),
new Country ("Italy", Country.Continent.EUROPE),
new Country ("Germany", Country.Continent.EUROPE));
Map<Country.Continent, List<String>> regionNames = couList.stream ()
.collect(Collectors.groupingBy (Country ::getRegion,
Collectors.mapping(Country::getName, Collectors.toList()))));
System.out.println(regionNames);
What is the output?
- A. {ASIA = [Japan], EUROPE = [Italy, Germany]}
- B. {EUROPE = [Italy, Germany], ASIA = [Japan]}
- C. {EUROPE = [Germany], EUROPE = [Italy], ASIA = [Japan]}
- D. {EUROPE = [Germany, Italy], ASIA = [Japan]}
Answer: B
NEW QUESTION # 136
Which statement is true about the single abstract method of the java.util.function.Predicate interface?
- A. It accepts one argument and returns boolean.
- B. It accepts one argument and always produces a result of the same type as the argument.
- C. It accepts an argument and produces a result of any data type.
- D. It accepts one argument and returns void.
Answer: A
Explanation:
Explanation
References:
NEW QUESTION # 137
Given the code fragment:
Which should be inserted into line n1to print Average = 2.5?
- A. DoubleStream str = Stream.of (1.0, 2.0, 3.0, 4.0);
- B. IntStream str = Stream.of (1, 2, 3, 4);
- C. Stream str = Stream.of (1, 2, 3, 4);
- D. IntStream str = IntStream.of (1, 2, 3, 4);
Answer: A
NEW QUESTION # 138
Given the code fragment:
Which code fragment, when inserted at line 7, enables printing 100?
- A. ToIntFunction funRef = e ?gt; e + 10;
int result = funRef.apply (value); - B. ToIntFunction<Integer> funRef = e ?gt; e + 10;
int result = funRef.applyAsInt (value); - C. IntFunction funRef = e ?gt; e + 10;
Integer result = funRef.apply (10); - D. Function<Integer> funRef = e ?gt; e + 10;
Integer result = funRef.apply(value);
Answer: D
NEW QUESTION # 139
Given this code;
Which two are correct after this class is instantiated and tested?
- A. If the value of i is set to 6, the value of j will be 18.
- B. If the value of j is set to 15, the value of i could be any integer value.
- C. If the value of i is set to 5, the value of j will be 1.
- D. If the value of i is set to 8, the value of j could be any integer value.
- E. If the value of i remains 3, the value of j will remain 9.
- F. If the value of j is set to 5, the value of i will be 15.
Answer: C,F
NEW QUESTION # 140
Given:
class Sum extends RecursiveAction { //line n1
static final int THRESHOLD_SIZE = 3;
int stIndex, lstIndex;
int [ ] data;
public Sum (int [ ]data, int start, int end) {
this.data = data;
this stIndex = start;
this. lstIndex = end;
}
protected void compute ( ) {
int sum = 0;
if (lstIndex – stIndex <= THRESHOLD_SIZE) {
for (int i = stIndex; i < lstIndex; i++) {
sum += data [i];
}
System.out.println(sum);
} else {
new Sum (data, stIndex + THRESHOLD_SIZE, lstIndex).fork( );
new Sum (data, stIndex,
Math.min (lstIndex, stIndex + THRESHOLD_SIZE)
).compute ();
}
}
}
and the code fragment:
ForkJoinPool fjPool = new ForkJoinPool ( );
int data [ ] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
fjPool.invoke (new Sum (data, 0, data.length));
and given that the sum of all integers from 1 to 10 is 55.
Which statement is true?
- A. The program prints several values whose sum exceeds 55.
- B. A compilation error occurs at line n1.
- C. The program prints several values that total 55.
- D. The program prints 55.
Answer: C
NEW QUESTION # 141
Given the code fragment:
Which statement can be inserted into line n1 to print 1,2; 1,10; 2,20;?
- A. BiConsumer<Integer, Integer, String> c = (i, j) -> {System.out.print (i + "," + j+ "; ")};
- B. BiConsumer<Integer, Integer, Integer> c = (i, j) -> {System.out.print (i + ","
+ j+ "; ");}; - C. BiConsumer<Integer,Integer> c = (i, j) -> {System.out.print (i + "," + j+ ";
");}; - D. BiFunction<Integer, Integer, String> c = (i, j) -> {System.out.print (i + "," + j+ "; ")};
Answer: D
NEW QUESTION # 142
......
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