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The 1z0-809 exam covers a wide range of topics, including Java Class Design, Advanced Inheritance, Generics and Collections, Lambda Expressions, Java File I/O (NIO.2), Concurrency, JDBC, Localization, and Annotations. Candidates are also expected to have experience with Java tools and technologies, including the Java Development Kit (JDK), the Java SE 8 API documentation, and the Java Platform, Enterprise Edition (Java EE). 1z1-809 exam consists of 85 multiple-choice and multiple-select questions and has a duration of 180 minutes. A passing score of 65% or higher is required to obtain certification.
NEW QUESTION # 124
Given:
What is the result?
- A. Red 0
Orange 1 - B. Compilation fails
- C. Red 0
Orange 0
Green 6 - D. Green 4
- E. Red 0
Orange 0
Green 3
Answer: B
NEW QUESTION # 125
Given:
public class Emp {
String fName;
String lName;
public Emp (String fn, String ln) {
fName = fn;
lName = ln;
}
public String getfName() { return fName; }
public String getlName() { return lName; }
}
and the code fragment:
List<Emp> emp = Arrays.asList (
new Emp ("John", "Smith"),
new Emp ("Peter", "Sam"),
new Emp ("Thomas", "Wale"));
emp.stream()
//line n1
.collect(Collectors.toList());
Which code fragment, when inserted at line n1, sorts the employees list in descending order of fNameand then ascending order of lName?
.sorted (Comparator.comparing(Emp::getfName).reserved().thenComparing
- A. .map(Emp::getfName).sorted(Comparator.reserveOrder().map
- B. (Emp::getlName))
.sorted (Comparator.comparing(Emp::getfName).thenComparing(Emp::getlName)) - C. (Emp::getlName).reserved
- D. .map(Emp::getfName).sorted(Comparator.reserveOrder())
Answer: B
NEW QUESTION # 126
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. BiFunction<Integer, Integer, String> c = (i, j) -> {System.out.print (i + "," + j+ "; ")};
- C. BiConsumer<Integer,Integer> c = (i, j) -> {System.out.print (i + "," + j+ "; ");};
- D. BiConsumer<Integer, Integer, Integer> c = (i, j) -> {System.out.print (i + "," + j+ "; ");};
Answer: B
Explanation:
References:
NEW QUESTION # 127
Given the code fragments :
and
What is the result?
- A. TV Price :110 Refrigerator Price :2100
- B. The program prints nothing.
- C. TV Price :1000 Refrigerator Price :2000
- D. A compilation error occurs.
Answer: A
NEW QUESTION # 128
Given:
public class Test<T> {
private T t;
public T get () {
return t;
}
public void set (T t) {
this.t = t;
}
public static void main (String args [ ] ) {
Test<String> type = new Test<>();
Test type 1 = new Test (); //line n1
type.set("Java");
type1.set(100); //line n2
System.out.print(type.get() + " " + type1.get());
}
}
What is the result?
Java 100
- A.
- B. java.lang.string@<hashcode>java.lang.Integer@<hashcode>
- C. A compilation error occurs. To rectify it, replace line n2with:
type1.set (Integer(100)); - D. A compilation error occurs. To rectify it, replace line n1with:
Test<Integer> type1 = new Test<>();
Answer: A
NEW QUESTION # 129
Given:
and the code fragment:
What is the result?
- A. A compilation error occurs because the try block is declared without a catch or finally block.
- B. A compilation error occurs at line n1.
- C. An exception is thrown at line n2.
- D. 0
Answer: D
NEW QUESTION # 130
Given the structure of the STUDENT table:
Student (id INTEGER, name VARCHAR)
Given:
public class Test {
static Connection newConnection =null;
public static Connection get DBConnection () throws SQLException {
try (Connection con = DriveManager.getConnection(URL, username, password)) { newConnection = con;
}
return newConnection;
}
public static void main (String [] args) throws SQLException {
get DBConnection ();
Statement st = newConnection.createStatement();
st.executeUpdate("INSERT INTO student VALUES (102, 'Kelvin')");
}
}
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the URL, userName, and passWord exists.
The SQL query is valid.
What is the result?
- A. A NullPointerException is thrown as runtime.
- B. The program executes successfully and the STUDENT table is updated with one record.
- C. The program executes successfully and the STUDENT table is NOT updated with any record.
- D. A SQLException is thrown as runtime.
Answer: D
NEW QUESTION # 131
Given:
Which two interfaces can you use to create lambda expressions?
- A. P
- B. T
- C. S
- D. Q
- E. U
- F. R
Answer: B,E
NEW QUESTION # 132
Given the code fragment:
Assume that dbURL, userName, and passwordare valid.
Which code fragment can be inserted at line n1to enable the code to print Connection Established?
- A. con = DriverManager.getConnection (userName, password, dbURL);
- B. Properties prop = new Properties();
prop.put ("user", userName);
prop.put ("password", password);
con = DriverManager.getConnection (dbURL, prop); - C. con = DriverManager.getConnection (dbURL);
con.setClientInfo ("user", userName);
con.setClientInfo ("password", password); - D. Properties prop = new Properties();
prop.put ("userid", userName);
prop.put ("password", password);
prop.put("url", dbURL);
con = DriverManager.getConnection (prop);
Answer: B
NEW QUESTION # 133
Given:
public class product { int id; int price;
public Product (int id, int price) {
this.id = id;
this.price = price;
}
public String toString() { return id + ":" + price; }
}
and the code fragment:
List<Product> products = Arrays.asList(new Product(1, 10),
new Product (2, 30),
new Product (2, 30));
Product p = products.stream().reduce(new Product (4, 0), (p1, p2) -> {
p1.price+=p2.price;
return new Product (p1.id, p1.price);});
products.add(p);
products.stream().parallel()
.reduce((p1, p2) - > p1.price > p2.price ? p1 : p2)
.ifPresent(System.out: :println);
What is the result?
- A. The program prints nothing.
- B. 4 : 60
2 : 30
3 : 20
1 : 10 - C. 4 : 0
- D. 4 : 60
- E. 2 : 30
Answer: B
NEW QUESTION # 134
Which statement best describes encapsulation?
- A. Encapsulation ensures that classes can be designed with some fields and methods declared as abstract.
- B. Encapsulation ensures that classes can be designed so that their methods are inheritable.
- C. Encapsulation ensures that classes can be designed so that if a method has an argument MyType x, any subclass of MyType can be passed to that method.
- D. Encapsulation ensures that classes can be designed so that only certain fields and methods of an object are accessible from other objects.
Answer: D
Explanation:
http://www.tutorialspoint.com/java/java_encapsulation.htm
NEW QUESTION # 135
Given the code fragment:
List<String> nL = Arrays.asList("Jim", "John", "Jeff");
Function<String, String> funVal = s -> "Hello : ".contact(s);
nL.Stream()
.map(funVal)
.peek(System.out::print);
What is the result?
Hello : Jim Hello : John Hello : Jeff
- A. The program prints nothing.
- B. Jim John Jeff
- C.
- D. A compilation error occurs.
Answer: A
NEW QUESTION # 136
Given that course.txt is accessible and contains:
Course : : Java
and given the code fragment:
public static void main (String[ ] args) {
int i;
char c;
try (FileInputStream fis = new FileInputStream ("course.txt");
InputStreamReader isr = new InputStreamReader(fis);) {
while (!isr.close()) { //line n1
isr.skip(2);
i = isr.read ();
c = (char) i;
System.out.print(c);
}
} catch (Exception e) {
e.printStackTrace();
}
}
What is the result?
- A. ur :: va
- B. ueJa
- C. A compilation error occurs at line n1.
- D. The program prints nothing.
Answer: D
NEW QUESTION # 137
Given the code fragment:
What is the result?
- A. text1text2
- B. text1
- C. text1text2text2text3
- D. [text1, text2]
Answer: A
NEW QUESTION # 138
Which class definition compiles?
- A.
- B.
- C.
- D.
Answer: C
Explanation:
Explanation
NEW QUESTION # 139
Given the code fragment:
What is the result?
- A. Checking...
- B. Checking...Checking...
- C. A compilation error occurs at line n1.
- D. A compilation error occurs at line n2.
Answer: C
NEW QUESTION # 140
Given the for loop construct:
for ( expr1 ; expr2 ; expr3 ) {
statement;
}
Which two statements are true?
- A. The expression expr1 is optional. it initializes the loop and is evaluated once, as the loop begin.
- B. When expr2 evaluates to false, the loop terminates. It is evaluated only after each iteration through the loop.
- C. The expression expr3 must be present. It is evaluated after each iteration through the loop.
- D. This is not the only valid for loop construct; there exits another form of for loop constructor.
Answer: A,B
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 # 141
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 n1to enable the code to print the maximum number in
the numslist?
- A. nums.stream().max()
- B. nums.stream().max(Comparator.comparing(a -> a)).get()
- C. nums.stream().max(Integer : : max).get()
- D. nums.stream().map(a -> a).max()
Answer: B
NEW QUESTION # 142
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. Stream<String> fc = Files.readAllLines (file);
fc.forEach (s - > System.out.println(s)); - B. List<String> fc = Files.list(file);
fc.stream().forEach (s - > System.out.println(s)); - C. List<String> fc = readAllLines(file);
fc.stream().forEach (s - > System.out.println(s)); - D. Stream<String> fc = Files.lines (file);
fc.forEach (s - > System.out.println(s));
Answer: D
NEW QUESTION # 143
Given the code fragment:
What is the result?
- A. Val:10 Val:20 Val:30
- B. Val:20 Val:40 Val:60
- C. Val: Val: Val:
- D. A compilation error occurs.
Answer: B
NEW QUESTION # 144
Given the code fragment:
What is the result?
- A. text1text2
- B. text1
- C. text1text2text2text3
- D. [text1, text2]
Answer: A
NEW QUESTION # 145
......
Oracle 1z0-809 certification exam is designed to test the knowledge and skills of Java developers who want to gain a deeper understanding of the Java programming language. 1z1-809 exam is intended for professionals who have already earned the Oracle Certified Associate (OCA) Java SE 8 Programmer certification and are looking to demonstrate their expertise in Java SE 8 programming.
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