1Z1-803 Exam Training Practice Tests (Oracle Java SE 7 Programmer I)]

Question 1

Given: Given:
public class SuperTest {
public static void main(String[] args) { statement1 statement2 statement3
}
}
class Shape {
public Shape() {
System.out.println("Shape: constructor");
}
public void foo() {
System.out.println("Shape: foo");
}
}
class Square extends Shape {
public Square() {
super();
}
public Square(String label) {
System.out.println("Square: constructor");
}
public void foo() {
super.foo();
}
public void foo(String label) {
System.out.println("Square: foo");
}
}
}
}
What should statement1, statement2, and statement3, be respectively, in order to produce the result?
Shape: constructor
Square: foo
Shape: foo

A. Square square = new Square ("bar");
square.foo ("bar");
square.foo(); B. Square square = new Square ();
square.foo ();
square.foo (); C. Square square = new Square ();
square.foo ();
square.foo(bar); D. Square square = new Square ("bar");
square.foo ("bar");
square.foo ("bar"); E. Square square = new Square ();
square.foo ();
square.foo("bar"); F. Square square = new Square();
square.foo("bar");
square.foo();

Correct Answer: F

Question 2

Given:

What is the result?

A. d B. The program prints nothing C. A StringIndexOutOfBoundsException is thrown at runtime. D. AnArrayIndexOutOfBoundsException is thrown at runtime. E. A NullPointerException is thrown at runtime.

Correct Answer: C

Question 3

Given the code fragment:
float x = 22.00f % 3.00f;
int y = 22 % 3;
System.out.print(x + ", "+ y);
What is the result?

A. 1.0, 1 B. Compilation fails C. An exception is thrown at runtime D. 7.33, 7 E. 1.0f, 1

Correct Answer: A

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Question 4

Given:

This class is poorly encapsulated. You need to change the circle class to compute and return the area instead.
What three modifications are necessary to ensure that the class is being properly encapsulated?

A. Change the getRadius () method:
public double getRadius () {
area = Math.PI * radius * radius;
return radius;
} B. Change the access modifier of the setradius () method to private C. When the radius is set in the Circle constructor and the setRadius () method, recomputed the
area and store it into the area field D. Change the getArea () method
public double getArea () { return area; }

Correct Answer: B,C,D

Question 5

Given the code fragment: What is the result?

A. Found Red Found Blue Found White Found Default B. Found Red Found Blue Found White C. Found Red D. Found Red Found Blue

Correct Answer: D

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Question 6

Given:
public class MyFor {
public static void main(String[] args) {
for (int ii = 0; ii < 4; ii++) {
System.out.println("ii = "+ ii);
ii = ii +1;
}
}
}
What is the result?

A. ii = 0 ii = 2 B. ii = 0 ii = 1 ii = 2 ii = 3 C. Compilation fails. D. ii =

Correct Answer: A

Question 7

Which three statements are benefits of encapsulation?

A. Enables the class implementation to protect its invariants B. Enables multiple instances of the same class to be created safely C. Permits classes to be combined into the same package D. Protects confidential data from leaking out of the objects E. Allows a class implementation to change without changing t he clients F. Prevents code from causing exceptions

Correct Answer: B,D,E

Question 8

Given the code fragment:
class Student {
int rollnumber;
String name;
List cources = new ArrayList();
// insert code here
public String toString() {
return rollnumber + " : " + name + " : " + cources;
} }
And,
public class Test { public static void main(String[] args) {
List cs = newArrayList();
cs.add("Java");
cs.add("C");
Student s = new Student(123,"Fred", cs);
System.out.println(s);
}
}
Which code fragment, when inserted at line // insert code here, enables class Test to print 123 : Fred : [Java, C]?

A. Student(int i, String name, List cs) {
/* initialization code goes here */
} B. private Student(int i, String name, List cs) {
/* initialization code goes here */
} C. Student(int i, String name, ArrayList cs) {
/* initialization code goes here */
} D. public void Student(int i, String name, List cs) {
/* initialization code goes here */
}

Correct Answer: A

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Question 9

Given: What is the result?

A. null B. Java.lang.NullPointerException C. compilation fails D. 0

Correct Answer: B

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Question 10

Which three are bad practices?

A. Checking for ArrayIndexoutofBoundsException and ensuring that the program can recover if one occur B. Checking for FileNotFoundException to inform a user that a filename entered is not valid C. Checking for ArrayIndexoutofBoundsException when iterating through an array to determine when all elements have been visited D. Checking for an IOException and ensuring that the program can recover if one occurs E. Checking for Error and. If necessary, restarting the program to ensure that users are unaware problems

Correct Answer: A,C,E

Oracle Java SE 7 Programmer I - 1Z1-803 Exam Practice Test