Oracle 1z0-811 Exam Dumps

Question 6 of 58

Given the code fragment:

Which two code fragments are valid at line 2?

for (int count = 0; count < 5; count++) {

System.out.print(count);

}

package p1;

import java.util.*;

public void display() {

List nums = new ArrayList<> ();

}

{

private int num;

}

private String name = “John”;

public void display() {

System.out.print(name);

}

Correct Answer: A, E

The correct options are those that conform to Java syntax rules within a class body. Option A is valid because it includes a for loop and a print statement, both of which are valid inside a method definition in a class. Option B is invalid because 'package p1;' must be declared at the beginning of the file, not inside a class. Option C is invalid because import statements must be at the top of the file, and non-static block cannot have method declarations. Option D is invalid because a block cannot directly contain member variable declarations. Therefore, Option E is valid because it includes member variables and methods inside the class body according to Java syntax rules.

Question 7 of 58

You have been asked to develop a Java program that prints the elements of an array in reverse order.

Which looping statement cannot be used to meet the requirement?

enhanced for

standard for

while

do-while

Correct Answer: A

The enhanced for loop cannot be used to traverse an array in reverse order. This type of loop is designed to iterate over elements from the beginning to the end, providing no means to control the iteration direction. On the other hand, standard for, while, and do-while loops offer the flexibility to control the index variable, making it possible to iterate through the array in reverse order.

Question 8 of 58

Given the code fragment:

Which statement is true?

The code results in a compilation error. To make it compile, insert at line n1: import java.lang.Math; import java.lang.Random;

The code compiles successfully

The code results in a compilation error. To make it compile, insert at line n1: import java.lang; import java.util;

The code results in a compilation error. To make it compile, insert at line n1: import java.util.*;

Correct Answer: D

The code will not compile because the Random class, ArrayList class, and List interface are part of the java.util package, which needs to be explicitly imported. The Math class is part of the java.lang package, which is automatically imported. Therefore, importing java.util.* at the beginning of the code will resolve the compilation errors.

Question 9 of 58

Given the code fragment:

What is the result?

pen pencil erasers paper

paper pen pencil erasers

A compilation error occurs.

A runtime exception is thrown.

Correct Answer: D

The given code attempts to add elements to specific indices in an ArrayList without populating the list up to those indices first. In Java, the ArrayList's add(int index, E element) method throws an IndexOutOfBoundsException if the specified index is out of range. Initially, the ArrayList is empty, so trying to add an element at index 1 or greater will result in an IndexOutOfBoundsException. Therefore, a runtime exception is thrown.

Question 10 of 58

Given the code fragment:

Which code fragment, when inserted at line n1, enables the code to print Java Programming:1?

System.out.println(name + “:” + count);

System.out.println(c.name + “:” + count);

System.out.println(c.name + “:” + Course.count);

System.out.println(Course.name + “:” + c.count);

Correct Answer: C

The correct code fragment to enable the code to print 'Java Programming:1' is 'System.out.println(c.name + “:” + Course.count);'. In this code, 'c.name' accesses the instance variable 'name' of the object 'c', which was assigned the value 'Java Programming'. 'Course.count' accesses the static variable 'count' of the class 'Course'. Since 'count' is incremented in the constructor when 'new Course("Java Programming")' is called, 'count' will be 1. This results in the output 'Java Programming:1'.