1z0-808 | The Up to the minute Guide To 1z0-808 exam
Q1. 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 ("bar");
square.foo ("bar");
square.foo ("bar");
C. Square square = new Square ();
square.foo ();
square.foo(bar);
D. Square square = new Square ();
square.foo ();
square.foo("bar");
E. Square square = new Square ();
square.foo ();
square.foo ();
F. Square square = new Square();
square.foo("bar");
square.foo();
Answer: F
Q2. Given the code fragment?
public class Test {
public static void main(String[] args) {
Test t = new Test();
int[] arr = new int[10];
arr = t.subArray(arr,0,2);
}
// insert code here
}
Which method can be inserted at line // insert code here to enable the code to compile?
A. public int[] subArray(int[] src, int start, int end) {
return src;
}
B. public int subArray(int src, int start, int end) {
return src;
}
C. public int[] subArray(int src, int start, int end) {
return src;
}
D. public int subArray(int[] src, int start, int end) {
return src;
}
Answer: A
Q3. Given:
What is the result?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: C
Q4. Given:
public class Test1 {
static void doubling (Integer ref, int pv) {
ref =20;
pv = 20;
}
public static void main(String[] args) {
Integer iObj = new Integer(10);
int iVar = 10;
doubling(iObj++, iVar++);
System.out.println(iObj+ ", "+iVar);
What is the result?
A. 11, 11
B. 10, 10
C. 21, 11
D. 20, 20
E. 11, 12
Answer: A
Explanation: The code doubling(iObj++, iVar++); increases both variables from to 10 to
11.
Q5. Given:
What is the result?
A. Area is 6.0
B. Area is 3.0
C. Compilation fails at line n1
D. Compilation fails at line n2.
Answer: D
Q6. Given the content of three files:
Which statement is true? Which statement is true?
A. Only the A.Java file compiles successfully.
B. Only the B.java file compiles successfully.
C. Only the C.java file compiles successfully.
D. The A.Java and B.java files compile successfully.
E. The B.java and C.java files compile successfully.
F. The A.Java and C.java files compile successfully.
Answer: A
Explanation: In class B.Java doStuff() has access modifier with variable name which is not allowed. C.Java class name is different than file name. Only private classes can have different names than file names
Q7. Which statement is true about Java byte code?
A. It can run on any platform.
B. It can run on any platform only if it was compiled for that platform.
C. It can run on any platform that has the Java Runtime Environment.
D. It can run on any platform that has a Java compiler.
E. It can run on any platform only if that platform has both the Java Runtime Environment and a Java compiler.
Answer: C
Q8. Given:
class Sports {
int num_players;
String name, ground_condition;
Sports(int np, String sname, String sground){
num_players = np;
name = sname;
ground_condition = sground;
}
}
class Cricket extends Sports {
int num_umpires;
int num_substitutes;
Which code fragment can be inserted at line //insert code here to enable the code to compile?
A. Cricket() {
super(11, "Cricket", "Condidtion OK");
num_umpires =3;
num_substitutes=2;
}
B. Cricket() {
super.ground_condition = "Condition OK";
super.name="Cricket";
super.num_players = 11;
num_umpires =3;
num_substitutes=2;
}
C. Cricket() {
this(3,2);
super(11, "Cricket", "Condidtion OK");
}
Cricket(int nu, ns) {
this.num_umpires =nu;
this.num_substitutes=ns;
}
D. Cricket() {
this.num_umpires =3;
this.num_substitutes=2;
super(11, "Cricket", "Condidtion OK");
}
Answer: A
Explanation:
Incorrect:
not C, not D: call to super must be the first statement in constructor.
Q9. Given:
public class SampleClass {
public static void main(String[] args) {
AnotherSampleClass asc = new AnotherSampleClass(); SampleClass sc = new
SampleClass();
sc = asc;
System.out.println("sc: " + sc.getClass());
System.out.println("asc: " + asc.getClass());
}}
class AnotherSampleClass extends SampleClass {
}
What is the result?
A. sc: class Object asc: class AnotherSampleClass
B. sc: class SampleClass asc: class AnotherSampleClass
C. sc: class AnotherSampleClass asc: class SampleClass
D. sc: class AnotherSampleClass asc: class AnotherSampleClass
Answer: D
Q10. Given:
What is the output?
A. [21, 13, 11]
B. [30]
C. []
D. Compilation fails due to error at line 7
E. Compilation tails due to error at line 10
Answer: D
Explanation:
Option D is the correct answer.
Code fails to compile as we can't use primitive for collections type, so in this code trying to
use int at line 7, causes a compile error. We should have use wrapper. Integer there. So
option D is correct.
https://docs.oracle.eom/javase/8/docs/api/java/util/ArrayList.html