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Oracle 1z0-808 Exam Sample Questions


Question # 1

Which usage represents a valid way of compiling java source file with the name "Main"?

A.

 javac Main.java

B.

java Main.class

C.

java Main.java

D.

 javac Main

E.

java Main



A.

 javac Main.java



The compiler is invoked by the javac command. When compiling a Java
class, you must include the file name, which houses the main classes including the Java
extension. So to run Main.java file we have to use command in option A.
TO execute Java program we can use Java command but can't use it for compiling.
https://docs.oracle.com/javase/tutorial/getStarted/application/index.html




Question # 2

Given the classes:
* AssertionError
* ArithmeticException
* ArrayIndexOutofBoundsException
* FileNotFoundException
* IllegalArgumentException
* IOError
* IOException
* NumberFormatException
* SQLException
Which option lists only those classes that belong to the unchecked exception category?

A.

AssertionError, ArrayIndexOutOfBoundsException, ArithmeticException

B.

AssertionError, IOError, IOException

C.

ArithmeticException, FileNotFoundException, NumberFormatException

D.

FileNotFoundException, IOException, SQLException

E.

ArrayIndexOutOfBoundException, IllegalArgumentException, FileNotFoundException



A.

AssertionError, ArrayIndexOutOfBoundsException, ArithmeticException


Not B: IOError and IOException are both checked errors.
Not C, not D, not E: FileNotFoundException is a checked error.
Note:
Checked exceptions:
* represent invalid conditions in areas outside the immediate control of the program (invalid
user input, database problems, network outages, absent files)
* are subclasses of Exception
* a method is obliged to establish a policy for all checked exceptions thrown by its
implementation (either pass the checked exception further up the stack, or handle it
somehow)
Note:
Unchecked exceptions:
* represent defects in the program (bugs) - often invalid arguments passed to a non-private
method. To quote from The Java Programming Language, by Gosling, Arnold, and Holmes:
"Unchecked runtime exceptions represent conditions that, generally speaking, reflect errors
in your program's logic and cannot be reasonably recovered from at run time."
* are subclasses of RuntimeException, and are usually implemented using
IllegalArgumentException, NullPointerException, or IllegalStateException
* method is not obliged to establish a policy for the unchecked exceptions thrown by its
implementation (and they almost always do not do so)




Question # 3

Given:

What is the result?

A.

The program prints nothing

B.

d

C.

A StringIndexOutOfBoundsException is thrown at runtime.

D.

AnArrayIndexOutOfBoundsException is thrown at runtime.

E.

A NullPointerException is thrown at runtime.



C.

A StringIndexOutOfBoundsException is thrown at runtime.





Question # 4

Given:
public class String1 {
public static void main(String[] args) {
String s = "123";
if (s.length() >2)
s.concat("456");
for(int x = 0; x <3; x++)
s += "x";
System.out.println(s);
}
}
What is the result?

A.

123

B.

123xxx

C.

123456

D.

123456xxx

E.

Compilation fails



B.

123xxx


123xxx
The if clause is not applied.
Note: Syntax of if-statement:
if ( Statement ) {
}




Question # 5

Given:
public class TestLoop {
public static void main(String[] args) {
int array[] = {0, 1, 2, 3, 4};
int key = 3;
for (int pos = 0; pos < array.length; ++pos) {
if (array[pos] == key) {
break;
}
}
System.out.print("Found " + key + "at " + pos);
}
}
What is the result?

A.

Found 3 at 2

B.

 Found 3 at 3

C.

Compilation fails

D.

An exception is thrown at runtime



C.

Compilation fails


The following line does not compile:
System.out.print("Found " + key + "at " + pos);
The variable pos is undefined at this line, as its scope is only valid in the for loop.
Any variables created inside of a loop are LOCAL TO THE LOOP.



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