1z0-808 Practice Test

Given:

What is the result?

A.

myStr: 9009, myNum: 9009

B.

myStr: 7007, myNum: 7007

C.

myStr: 7007, myNum: 9009

D.

Compilation fails

Given:
import java.util.*;
public class Ref {
public static void main(String[] args) {
StringBuilder s1 = new StringBuilder("Hello Java!");
String s2 = s1.toString();
List<String> lst = new ArrayList<String>();
lst.add(s2);
System.out.println(s1.getClass());
System.out.println(s2.getClass());
System.out.println(lst.getClass());
}
}
What is the result?

A.

class java.lang.String
class java.lang.String
class java.util.ArrayList

B.

class java.lang.Object
class java.lang. Object
class java.util.Collection

C.

class java.lang.StringBuilder
class java.lang.String
class java.util.ArrayList

D.

class java.lang.StringBuilder
class java.lang.String
class java.util.List

Given the code fragment:

What is the result?

A.

 true true

B.

True false

C.

false false

D.

false true

L.

       

Given:
public class TestField {
int x;
int y;
public void doStuff(int x, int y) {
this.x = x;
y =this.y;
}
public void display() {
System.out.print(x + " " + y + " : ");
}
public static void main(String[] args) {
TestField m1 = new TestField();
m1.x = 100;
m1.y = 200;
TestField m2 = new TestField();
m2.doStuff(m1.x, m1.y);
m1.display();
m2.display();
}
}
What is the result?

A.

100 200 : 100 200

B.

100 0 : 100 0 :

C.

 100 200 : 100 0 :

D.

100 0 : 100 20

Given the following two classes:

How should you write methods in the ElectricAccount class at line n1 so that the member
variable bill is always equal to the value of the member variable kwh multiplied by the
member variable rate?
Any amount of electricity used by a customer (represented by an instance of the customer
class) must contribute to the customer's bill (represented by the member variable bill)
through the method useElectricity method. An instance of the customer class should never
be able to tamper with or decrease the value of the member variable bill.

A.

Option A

B.

Option B

C.

Option C

D.

Option D