1z0-808 Exam Training Practice Tests (Oracle Java SE 8 Programmer I)]

Question 1

Given:

What is the result?

A. A NullPointerException is thrown at runtime B. True null C. Compilation fails D. True false

Correct Answer: D

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Question 2

Given:

Which two code fragments are valid?

A. Option E B. Option D C. Option B D. Option A E. Option C

Correct Answer: B,C

Question 3

Given these requirements:
- Bus and Boat are Vehicle type classes.
- The start() and stop() methods perform common operations across the
Vehicle class type.
- The ride() method performs a unique operations for each type of
Vehicle.
Which set of actions meets the requirements with optimized code?

A. 1. Create an abstract class Vehicle by defining start() and stop() methods, and declaring the ride() abstract method.
2. Create Bus and Boat classes by inheriting the Vehicle class and overriding the ride() method. B. 1. Create an interface Vehicle by defining start() and stop() methods, and declaring the ride() abstract method.
2. Create Bus and Boat classes by implementing the Vehicle class. C. 1. Create an interface Vehicle by defining default stop(), start(), and ride() methods.
2. Create Bus and Boat classes by implementing the Vehicle interface and overriding the ride() method. D. 1. Create an abstract class Vehicle by declaring stop(), start(), and ride() abstract methods.
2. Create Bus and Boat classes by inheriting the Vehicle class and overriding all the methods.

Correct Answer: B

Question 4

Given the class definitrions:
class Shape { }
class Square extends Shape { }
Given the variable declarations:
Shape shape1 = null;
Square square1 = null;
Which four compile?

A. square1 = new Square();
shape1 = square1; B. shape1 = new Shape();
square1 = shape1; C. shape1 = (Square) new Square(); D. shape1 = new Square(); E. square1 = new Shape(); F. square1 = (Square) new Shape();

Correct Answer: A,C,D,F

Question 5

Given the code fragment:
public class Test {
static String[][] arr =new String[3][];
private static void doPrint() {
//insert code here
}
public static void main(String[] args) {
String[] class1 = {"A","B","C"};
String[] class2 = {"L","M","N","O"};
String[] class3 = {"I","J"};
arr[0] = class1;
arr[1] = class2;
arr[2] = class3;
Test.doPrint();
}
}
Which code fragment, when inserted at line //insert code here, enables the code to print COJ?

A. private static void doPrint() {
for (int i = 0;i < arr.length;i++) {
int j = arr[i].length-1;
System.out.print(arr[i][j]);
}
} B. int i = 0;
for (String[] sub: arr[][]) {
int j = sub.length;
System.out.print(arr[i][j]);
i++;
} C. int i = 0;
for (String[] sub: arr) {
int j = sub.length -1;
for (String str: sub) {
System.out.println(str[j]);
i++;
}
} D. for (int i = 0;i < arr.length-1;i++) {
int j = arr[i].length-1;
System.out.print(arr[i][j]);
i++;
}

Correct Answer: A

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Question 6

Given the following code for the classes MyException and Test:

What is the result?

A. Either A or B B. A compile time error occurs at line n1 C. B D. A E. A B

Correct Answer: C

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Question 7

Given:

What is the result?

A. true:false B. true:true C. false:true D. false:false

Correct Answer: C

Question 8

Given the code fragment:
StringBuilder sb = new StringBuilder ( ) ;
Sb.append ("world");
Which code fragment prints Hello World?

A. sb.set(0,"Hello ");
System.out.println(sb);D B. sb.append(0,"Hello ");
System.out.println(sb); C. sb.insert(0,"Hello ");
System.out.println(sb); D. sb.add(0,"Hello ");
System.out.println(sb);

Correct Answer: C

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Question 9

Given the code in a file Traveler.java:

And the commands:
Javac Traveler.java
Java Traveler Java Duke
What is the result?

A. Happy Journey! Duke B. An exception is thrown at runtime C. The program fails to execute due to a runtime error D. Happy Journey! Java

Correct Answer: A

Question 10

Given the code fragment:

What is the result?

A. Found Red
Found Blue
Found Teal
Found Default B. Found Teal C. Found Red
Found Default D. Found Red
Found Blue
Found Teal E. Found Default

Correct Answer: E

Question 11

Which two are valid declarations of a two-dimensional array?

A. int array2D[]; B. int[2][2] array2D; C. int[] array2D[]; D. int[][] array2D; E. int[][] array2D[];

Correct Answer: C,D

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Question 12

Which two are valid array declaration?

A. Float[2] array; B. Boolean array[3]; C. Object array[]; D. int[] array;

Correct Answer: C,D

Oracle Java SE 8 Programmer I - 1z0-808 Exam Practice Test