Oracle meilleur examen 1Z0-853, questions et réponses

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Code d'Examen: 1Z0-853

Nom d'Examen: Oracle (Java Standard Edition 5 Programmer Certified Professional Exam)

Questions et réponses: 362 Q&As

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NO.1 Given:
10. class Line {

NO.2

NO.3 // insert code here

NO.4 Given:
11. public class Yikes {
12.
13. public static void go(Long n) {System.out.println("Long ");}
14. public static void go(Short n) {System.out.println("Short ");}
15. public static void go(int n) {System.out.println("int ");}
16. public static void main(String [] args) {
17. short y = 6;
18. long z = 7;
19. go(y);
20. go(z);
21. }
22. }
What is the result?
A. An exception is thrown at runtime.
B. int Long
C. Compilation fails.
D. Short Long
Answer: B

Oracle   1Z0-853   1Z0-853 examen

NO.5 class Triangle {

NO.6 Click the Exhibit button.
Given this code from Class B:
25. A a1 = new A();
26. A a2 = new A();
27. A a3 = new A();
28. System.out.println(A.getInstanceCount());
What is the result?
A. Compilation of class A fails.
B. Line 28 prints the value 3 to System.out.
C. Line 28 prints the value 1 to System.out.
D. Compilation fails because of an error on line 28.
E. A runtime error occurs when line 25 executes.
Answer: A

Oracle   1Z0-853 examen   1Z0-853   1Z0-853

NO.7 DRAG DROP
Click the Task button.
Answer:

NO.8 Given:
12. NumberFormat nf = NumberFormat.getInstance();
13. nf.setMaximumFractionDigits(4);
14. nf.setMinimumFractionDigits(2);
15. String a = nf.format(3.1415926);
16. String b = nf.format(2);
Which two statements are true about the result if the default locale is Locale.US? (Choose two.)
A. The value of b is 2.00.
B. The value of a is 3.141.
C. The value of a is 3.14.
D. The value of b is 2.0000.
E. The value of a is 3.1415.
F. The value of a is 3.1416.
G. The value of b is 2.
Answer: A,F

Oracle   1Z0-853   1Z0-853

NO.9 System.out.print(" main x = " + x);

NO.10 }

NO.11 }

NO.12

NO.13 public static class Point {}

NO.14 }

NO.15 Given:
11. public static void main(String[] args) {
12. Object obj = new int[] { 1, 2, 3 };
13. int[] someArray = (int[])obj;
14. for (int i : someArray) System.out.print(i + " ");
15. }
What is the result?
A. Compilation fails because of an error in line 13.
B. A ClassCastException is thrown at runtime.
C. 1 2 3
D. Compilation fails because of an error in line 14.
E. Compilation fails because of an error in line 12.
Answer: C

certification Oracle   1Z0-853   1Z0-853

NO.16 System.out.print(" doStuff x = " + x++);

NO.17 int x = 6;

NO.18 Click the Exhibit button.
Given:
25. try {
26. A a = new A();
27. a.method1();
28. } catch (Exception e) {
29. System.out.print("an error occurred");
30. }
Which two statements are true if a NullPointerException is thrown on line 3 of class C? (Choose two.)
A. The application will crash.
B. The code on line 29 will be executed.
C. The code on line 5 of class A will execute.
D. The exception will be propagated back to line 27.
E. The code on line 5 of class B will execute.
Answer: B,D

Oracle   1Z0-853 examen   1Z0-853 examen

NO.19 Given:
10. class One {
11. void foo() { }
12. }
13. class Two extends One {
14. //insert method here
15. }
Which three methods, inserted individually at line 14, will correctly complete class Two? (Choose three.)
A. public void foo() { /* more code here */ }
B. private void foo() { /* more code here */ }
C. protected void foo() { /* more code here */ }
D. int foo() { /* more code here */ }
E. void foo() { /* more code here */ }
Answer: A,C,E

certification Oracle   certification 1Z0-853   1Z0-853 examen

NO.20 Given:
10. interface Jumper { public void jump(); } ...
20. class Animal {} ...
30. class Dog extends Animal {
31. Tail tail;
32. }
...
40. class Beagle extends Dog implements Jumper{
41. public void jump() {} 42. }
...
50. class Cat implements Jumper{
51. public void jump() {}
52. }.Which three are true? (Choose three.)
A. Cat is-a Jumper
B. Cat is-a Animal
C. Dog is-a Jumper
D. Dog is-a Animal
E. Beagle has-a Jumper
F. Cat has-a Animal
G. Beagle has-a Tail
Answer: A,D,G

Oracle examen   1Z0-853   1Z0-853 examen   1Z0-853 examen   1Z0-853

NO.21 void doStuff(int x) {

NO.22 Given:
11. public class ItemTest {
12. private final int id;
13. public ItemTest(int id) { this.id = id; }
14. public void updateId(int newId) { id = newId; }
15.
16. public static void main(String[] args) {
17. ItemTest fa = new ItemTest(42);
18. fa.updateId(69);
19. System.out.println(fa.id);
20. }
21. }
What is the result?
A. A new Item object is created with the preferred value in the id attribute.
B. The attribute id in the Item object is modified to the new value.
C. Compilation fails.
D. An exception is thrown at runtime.
E. The attribute id in the Item object remains unchanged.
Answer: C

Oracle   1Z0-853 examen   1Z0-853   1Z0-853

NO.23 p.doStuff(x);

NO.24 Given:
11. // insert code here
12. private N min, max;
13. public N getMin() { return min; }
14. public N getMax() { return max; }
15. public void add(N added) {
16. if (min == null || added.doubleValue() < min.doubleValue()) 17. min = added;
18. if (max == null || added.doubleValue() > max.doubleValue()) 19. max = added;
20. }
21. }
Which two, inserted at line 11, will allow the code to compile? (Choose two.)
A. public class MinMax<? extends Object> {
B. public class MinMax<N extends Integer> {
C. public class MinMax<N extends Object> {
D. public class MinMax<N extends Number> {
E. public class MinMax<?> {
F. public class MinMax<? extends Number> {
Answer: B,D

Oracle examen   1Z0-853 examen   certification 1Z0-853   1Z0-853 examen

NO.25 Pass2 p = new Pass2();

NO.26 }
Which code, inserted at line 15, creates an instance of the Point class defined in Line?
A. Line l = new Line() ; l.Point p = new l.Point();
B. Line.Point p = new Line.Point();
C. The Point class cannot be instatiated at line 15.
D. Point p = new Point();
Answer: B

Oracle   1Z0-853   1Z0-853 examen   certification 1Z0-853   1Z0-853 examen
11.Click the Exhibit button.
What is the result?
A. The code will deadlock.
B. The code may run with output "2 0 6 4".
C. The code may run with no output.
D. The code may run with output "0 6".
E. An exception is thrown at runtime.
F. The code may run with output "0 2 4 6".
Answer: F

Oracle examen   1Z0-853   1Z0-853   certification 1Z0-853   certification 1Z0-853
12.Given:
1. public class Blip {
2. protected int blipvert(int x) { return 0; }
3. }
4. class Vert extends Blip {
5. // insert code here
6. }
Which five methods, inserted independently at line 5, will compile? (Choose five.)
A. protected int blipvert(long x) { return 0; }
B. protected long blipvert(int x) { return 0; }
C. private int blipvert(long x) { return 0; }
D. private int blipvert(int x) { return 0; }
E. public int blipvert(int x) { return 0; }
F. protected long blipvert(long x) { return 0; }
G. protected long blipvert(int x, int y) { return 0; }
Answer: A,C,E,F,G

Oracle   1Z0-853 examen   1Z0-853   1Z0-853
13.DRAG DROP
Click the Task button.
Answer:
14.Given:
12. System.out.format("Pi is approximately %d.", Math.PI);
What is the result?
A. An exception is thrown at runtime.
B. Compilation fails.
C. Pi is approximately 3.
D. Pi is approximately 3.141593.
Answer: A

Oracle   certification 1Z0-853   certification 1Z0-853   1Z0-853
15.Given the command line java Pass2 and:
15. public class Pass2 {
16. public void main(String [] args) {

NO.27 }
What is the result?
A. doStuff x = 6 main x = 6
B. Compilation fails.
C. doStuff x = 6 main x = 7
D. An exception is thrown at runtime.
E. doStuff x = 7 main x = 6
F. doStuff x = 7 main x = 7
Answer: D

Oracle   1Z0-853 examen   certification 1Z0-853   1Z0-853
16.Given:
13. public static void search(List<String> list) {
14. list.clear();
15. list.add("b");
16. list.add("a");
17. list.add("c");
18. System.out.println(Collections.binarySearch(list, "a"));
19. }
What is the result of calling search with a valid List implementation?
A. 0
B. The result is undefined.
C. a
D. 2
E. 1
F. c
G. b
Answer: B

Oracle   1Z0-853 examen   1Z0-853   1Z0-853   1Z0-853
17.Click the Exhibit button.
Given: ClassA a = new ClassA();
a.methodA();
What is the result?
A. The code runs with no output.
B. Compilation fails.
C. An exception is thrown at runtime.
D. ClassC is displayed.
Answer: C

Oracle   1Z0-853   1Z0-853
18.Given:
11. public static void test(String str) {
12. int check = 4;
13. if (check = str.length()) {
14. System.out.print(str.charAt(check -= 1) +", ");
15. } else {
16. System.out.print(str.charAt(0) + ", ");
17. }
18. }
and the invocation:
21. test("four");
22. test("tee");
23. test("to");
What is the result?
A. An exception is thrown at runtime.
B. r, e, o,
C. Compilation fails.
D. r, t, t,
Answer: C

Oracle examen   1Z0-853   1Z0-853
19.A JavaBeans component has the following field:
11. private boolean enabled;
Which two pairs of method declarations follow the JavaBeans standard for accessing this field? (Choose
two.)
A. public boolean setEnabled( boolean enabled )
public boolean getEnabled()
B. public void setEnabled( boolean enabled )
public void isEnabled()
C. public void setEnabled( boolean enabled )
public boolean getEnabled()
D. public void setEnabled( boolean enabled )
public boolean isEnabled()
Answer: C,D

certification Oracle   1Z0-853 examen   1Z0-853   1Z0-853
20.Given:
11. public void genNumbers() {
12. ArrayList numbers = new ArrayList();
13. for (int i=0; i<10; i++) {
14. int value = i * ((int) Math.random());
15. Integer intObj = new Integer(value);
16. numbers.add(intObj);
17. }
18. System.out.println(numbers);
19. }
Which line of code marks the earliest point that an object referenced by intObj becomes a
candidate for garbage collection?
A. Line 19
B. The object is NOT a candidate for garbage collection.
C. Line 17
D. Line 16
E. Line 18
Answer: A

Oracle   1Z0-853   1Z0-853   certification 1Z0-853
21.Given:
11. String test = "This is a test";
12. String[] tokens = test.split("\s");
13. System.out.println(tokens.length);
What is the result?
A. An exception is thrown at runtime.
B. 1
C. 4
D. Compilation fails.
E. 0
Answer: D

Oracle   1Z0-853   1Z0-853   1Z0-853   1Z0-853
22.Given:
12. System.out.format("Pi is approximately %d.", Math.PI);
What is the result?
A. An exception is thrown at runtime.
B. Pi is approximately 3.
C. Pi is approximately 3.141593.
D. Compilation fails.
Answer: A

certification Oracle   1Z0-853   1Z0-853   1Z0-853
23.DRAG DROP
Click the Task button.
Answer:
24.Given:
11. static class A {
12. void process() throws Exception { throw new Exception(); }
13. }
14. static class B extends A {
15. void process() { System.out.println("B "); }
16. }
17. public static void main(String[] args) {
18. A a = new B();
19. a.process();
20. }
What is the result?
A. Compilation fails because of an error in line 19.
B. An exception is thrown at runtime.
C. B
D. Compilation fails because of an error in line 18.
E. Compilation fails because of an error in line 15.
F. The code runs with no output.
Answer: A

Oracle   certification 1Z0-853   1Z0-853 examen   1Z0-853   1Z0-853 examen
25.Given:
1. interface A { public void aMethod(); }
2. interface B { public void bMethod(); }
3. interface C extends A,B { public void cMethod(); }
4. class D implements B {
5. public void bMethod(){}
6. }
7. class E extends D implements C {
8. public void aMethod(){}
9. public void bMethod(){}
10. public void cMethod(){}
11. }
What is the result?
A. If you define D e = new E(), then e.bMethod() invokes the version of bMethod() defined in Line 5.
B. If you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 5.
C. Compilation fails because of an error in line 9.
D. If you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 9.
E. Compilation fails because of an error in line 3.
F. Compilation fails because of an error in line 7.
Answer: D

Oracle   1Z0-853   1Z0-853   1Z0-853   1Z0-853 examen   1Z0-853
26.Click the Exhibit button.
What is the output of the program shown in the exhibit?
A. 300-300-100-100-100
B. 300-300-300-100-100
C. 300-300-300-300-100
D. 300-100-100-100-100
Answer: A

certification Oracle   1Z0-853   1Z0-853   1Z0-853 examen

NO.28 Given:
11. class A {
12. public void process() { System.out.print("A,"); }
13. class B extends A {
14. public void process() throws IOException {
15. super.process();
16. System.out.print("B,");
17. throw new IOException();
18. }
19. public static void main(String[] args) {
20. try { new B().process(); }
21. catch (IOException e) { System.out.println("Exception"); }}
What is the result?
A. Compilation fails because of an error in line 14.
B. Exception
C. A,B,Exception
D. Compilation fails because of an error in line 20.
E. A NullPointerException is thrown at runtime.
Answer: A

certification Oracle   certification 1Z0-853   1Z0-853   1Z0-853   1Z0-853   certification 1Z0-853

NO.29 Which two code fragments correctly create and initialize a static array of int elements.? (Choose two.)
A. static final int[] a = { 100,200 };
B. static final int[] a;
static { a=new int[2]; a[0]=100; a[1]=200; }
C. static final int[] a;
static void init() { a = new int[3]; a[0]=100; a[1]=200; }
D. static final int[] a = new int[2]{ 100,200 };
Answer: A,B

Oracle examen   certification 1Z0-853   1Z0-853

NO.30 Given:
20. public class CreditCard {
21.
22. private String cardID;
23. private Integer limit;
24. public String ownerName;
25.
26. public void setCardInformation(String cardID,
27. String ownerName,
28. Integer limit) {
29. this.cardID = cardID;
30. this.ownerName = ownerName;
31. this.limit = limit;
32. }
33. }
Which statement is true?
A. The cardID and limit variables break polymorphism.
B. The code demonstrates polymorphism.
C. The ownerName variable breaks encapsulation.
D. The setCardInformation method breaks encapsulation.
E. The class is fully encapsulated.
Answer: C

Oracle examen   1Z0-853 examen   1Z0-853   1Z0-853   1Z0-853

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