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 1z0-809 Dumps with Practice Exam Questions Answers

Questions: 196 questions

Last Update: Apr 14, 2024

Oracle Certification Exam 1z0-809 has been designed to measure your skills in handling the technical tasks mentioned in the certification syllabus

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1z0-809 Questions and Answers

Question # 1

Given:

From what threading problem does the program suffer?

A.

race condition

B.

deadlock

C.

starvation

D.

livelock

Question # 2

Given:

and the code fragment:

What is the result?

A.

[Java EE: Helen:Houston][Java ME: Jessy:Chicago, Java ME: Mark:Chicago]

B.

Java EEJava ME

C.

[Java ME: Jessy:Chicago, Java ME: Mark:Chicago][Java EE: Helen:Houston]

D.

A compilation error occurs.

Question # 3

Given:

class Vehicle implements Comparable{

int vno;

String name;

public Vehicle (int vno, String name) {

this.vno = vno,;

this.name = name;

}

public String toString () {

return vno + “:” + name;

}

public int compareTo(Vehicle o) {

return this.name.compareTo(o.name);

}

and this code fragment:

Set vehicles = new TreeSet <> ();

vehicles.add(new Vehicle (10123, “Ford”));

vehicles.add(new Vehicle (10124, “BMW”));

System.out.println(vehicles);

What is the result?

A.

[10123:Ford, 10124:BMW]

B.

[10124:BMW, 10123:Ford]

C.

A compilation error occurs.

D.

A ClassCastException is thrown at run time.

Question # 4

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.

The program executes successfully and the STUDENT table is updated with one record.

B.

The program executes successfully and the STUDENT table is NOT updated with any record.

C.

A SQLException is thrown as runtime.

D.

A NullPointerException is thrown as runtime.

Question # 5

Given the code fragments:

class TechName {

String techName;

TechName (String techName) {

this.techName=techName;

}

}

and

List tech = Arrays.asList (

new TechName(“Java-“),

new TechName(“Oracle DB-“),

new TechName(“J2EE-“)

);

Stream stre = tech.stream();

//line n1

Which should be inserted at line n1 to print Java-Oracle DB-J2EE-?

A.

stre.forEach(System.out::print);

B.

stre.map(a-> a.techName).forEach(System.out::print);

C.

stre.map(a-> a).forEachOrdered(System.out::print);

D.

stre.forEachOrdered(System.out::print);