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2021 Jul 1z0-808 test question
Q51. 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.
Q52. 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.
Q53. Given:
What is the result?
A. true true
B. true false
C. false true
D. false false
E. Compilation fails
Answer: E
Q54. Which statement will empty the contents of a StringBuilder variable named sb?
A. sb.deleteAll();
B. sb.delete(0, sb.size());
C. sb.delete(0, sb.length());
D. sb.removeAll();
Answer: C
Q55. Given the code fragment:
// insert code here
arr[0] = new int[3];
arr[0][0] = 1;
arr[0][1] = 2;
arr[0][2] = 3;
arr[1] = new int[4];
arr[1][0] = 10;
arr[1][1] = 20;
arr[1][2] = 30;
arr[1][3] = 40;
Which two statements, when inserted independently at line // insert code here, enable the code to compile?
A. int [] [] arr = null;
B. int [] [] arr = new int [2];
C. int [] [] arr = new int [2] [ ];
D. int [] [] arr = new int [] [4];
E. int [] [] arr = new int [2] [0];
F. int [] [] arr = new int [0] [4];
Answer: C,E
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Q56. 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
Q57. Given:
public class ColorTest {
public static void main(String[] args) {
String[] colors = {"red", "blue","green","yellow","maroon","cyan"};
int count = 0;
for (String c : colors) {
if (count >= 4) {
break;
}
else {
continue;
}
if (c.length() >= 4) {
colors[count] = c.substring(0,3);
}
count++;
}
System.out.println(colors[count]);
}
}
What is the result?
A. Yellow
B. Maroon
C. Compilation fails
D. A StringIndexOutOfBoundsException is thrown at runtime.
Answer: C
Explanation: The line, if (c.length() >= 4) {, is never reached. This causes a compilation error.
Note: The continue statement skips the current iteration of a for, while , or do-while loop. An unlabeled.break.statement terminates the innermost.switch,.for,.while, or.do-while.statement, but a labeled.break.terminates an outer statement.
Q58. Given:
What is the result?
A. true:true
B. true:false
C. false:true
D. false:false
Answer: C
Q59. Consider following interface.
Which of the following will create instance of Runnable type?
A. Runnable run = 0 -> {System.out.println("Run");}
B. Runnable run = 0 -> System.outprintlnfRun");
C. Runnable run = 0 > System.outprintlnfRun");
D. Runnable run = > System.ouLprintlnfRun"};
E. None of the above.
Answer: A
Explanation:
Option A is the correct answer.
To create we have used following method with LocalDate class;
public static LocalDate of(intyear, int month, intdayOfMonth)
Here we need to remember that month is not zero based so if you pass 1 for month, then
month will be January.
Then we have used period object of 1 day and add to date object which makes current date
to next day, so final output is 2015-03-27. Hence option A is correct.
Q60. 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 : 100 200 :
Answer: C