Bien qu'Il y ait plein de talentueux dans cette société, il manque beaucoup de professionnels dans les domaine en cours de développement, l'Industrie IT est l'un de ces domaines. Donc le test Oracle 1Z0-851 est un bon l'examination de technique informatique. Pass4Test est un site d'offrir la formation particulière au test Oracle 1Z0-851.
Différentes façons peuvent atteindre le même but, ça dépend laquelle que vous prenez. Beaucoup de gens choisissent le test Oracle 1Z0-851 pour améliorer la vie et la carrière. Mais tous les gens ont déjà participé le test Oracle 1Z0-851, ils savent qu'il est difficile à réussir le test. Il y a quelques dépensent le temps et l'argent, mais ratent finalement.
La Q&A de Pass4Test vise au test Certificat Oracle 1Z0-851. L'outil de formation Oracle 1Z0-851 offert par Pass4Test comprend les exercices de pratique et le test simulation. Vous pouvez trouver les autres sites de provider la Q&A, en fait vous allez découvrir que c'est l'outil de formation de Pass4Test qui offre les documentaions plus compètes et avec une meilleure qualité.
Choisissez le Pass4Test, choisissez le succès de test Oracle 1Z0-851. Bonne chance à vous.
Code d'Examen: 1Z0-851
Nom d'Examen: Oracle (Java Standard Edition 6 Programmer Certified Professional Exam)
Questions et réponses: 290 Q&As
Choisir le Pass4Test vous permet non seulement à réussir le test Oracle 1Z0-851, mais encore à enjouir le service en ligne 24h et la mise à jour gratuite pendant un an. Nous allons lancer au premier temps la Q&A Oracle 1Z0-851 plus nouvelle. Si vous ne passez pas le test, votre argent sera tout rendu.
Dépenser assez de temps et d'argent pour réussir le test Oracle 1Z0-851 ne peut pas vous assurer à passer le test Oracle 1Z0-851 sans aucune doute. Choisissez le Pass4Test, moins d'argent coûtés mais plus sûr pour le succès de test. Dans cette société, le temps est tellement précieux que vous devez choisir un bon site à vous aider. Choisir le Pass4Test symbole le succès dans le future.
1Z0-851 Démo gratuit à télécharger: http://www.pass4test.fr/1Z0-851.html
NO.1 System.out.println(sb1 + " " + s1)
;
Which code fragment, inserted at line 24, outputs "123abc 123abc"
?A. sb1.append("abc"); s1.append("abc")
;
B. sb1.append("abc"); s1.concat("abc")
;
C. sb1.concat("abc"); s1.append("abc")
;
D. sb1.concat("abc"); s1.concat("abc")
;
E. sb1.append("abc"); s1 = s1.concat("abc")
;
F. sb1.concat("abc"); s1 = s1.concat("abc")
;
G. sb1.append("abc"); s1 = s1 + s1.concat("abc")
;
H. sb1.concat("abc"); s1 = s1 + s1.concat("abc")
;
Answer: E
Oracle examen certification 1Z0-851 certification 1Z0-851 1Z0-851
18.Given that the current directory is empty, and that the user has read and write permissions, and the
following:
11. import java.io.*;
12. public class DOS {
13. public static void main(String[] args) {
14. File dir = new File("dir");
15. dir.mkdir();
16. File f1 = new File(dir, "f1.txt");
17. try {
18. f1.createNewFile();
19. } catch (IOException e) { ; }
20. File newDir = new File("newDir");
21. dir.renameTo(newDir);
22. }
23.
}
Which statement is true?
A. Compilation fails.
B. The file system has a new empty directory named dir.
C. The file system has a new empty directory named newDir.
D. The file system has a directory named dir, containing a file f1.txt.
E. The file system has a directory named newDir, containing a file f1.txt.
Answer: E
Oracle 1Z0-851 examen certification 1Z0-851 certification 1Z0-851
19.Given:
11. class Converter {
12. public static void main(String[] args) {
13. Integer i = args[0];
14. int j = 12;
15. System.out.println("It is " + (j==i) + " that j==i.");
16. }
17. }
What is the result when the programmer attempts to compile the code and run it with the
command java Converter 12?
A. It is true that j==i.
B. It is false that j==i.
C. An exception is thrown at runtime.
D. Compilation fails because of an error in line 13.
Answer: D
Oracle 1Z0-851 examen 1Z0-851 1Z0-851 1Z0-851 examen
20.Given:
11. String test = "Test A. Test B. Test C.";
12. // insert code here
13. String[] result = test.split(regex);
Which regular expression, inserted at line 12, correctly splits test into "Test A", "Test B", and "Test
C"?
A. String regex = "";
B. String regex = " ";
C. String regex = ".*";
D. String regex = "\\s";
E. String regex = "\\.\\s*";
F. String regex = "\\w[ \.] +";
Answer: E
Oracle 1Z0-851 examen 1Z0-851 1Z0-851 examen 1Z0-851
21.Given:
5. import java.util.Date;
6. import java.text.DateFormat;
21. DateFormat df;
22. Date date = new Date();
23. // insert code here
24. String s = df.format(date);
Which code fragment, inserted at line 23, allows the code to compile?
A. df = new DateFormat();
B. df = Date.getFormat();
C. df = date.getFormat();
D. df = DateFormat.getFormat();
E. df = DateFormat.getInstance();
Answer: E
Oracle examen 1Z0-851 examen 1Z0-851 1Z0-851
22.Given a class Repetition:
1. package utils;
2.
3. public class Repetition {
4. public static String twice(String s) { return s + s; }
5. } and given another class Demo: 1. // insert code here
2.
3. public class Demo {
4. public static void main(String[] args) {
5. System.out.println(twice("pizza"));
6. }
7. }
Which code should be inserted at line 1 of Demo.java to compile and run Demo to print
"pizzapizza"?
A. import utils.*;
B. static import utils.*;
C. import utils.Repetition.*;
D. static import utils.Repetition.*;
E. import utils.Repetition.twice();
F. import static utils.Repetition.twice;
G. static import utils.Repetition.twice;
Answer: F
Oracle 1Z0-851 examen 1Z0-851 examen 1Z0-851
23.A UNIX user named Bob wants to replace his chess program with a new one, but he is not sure where
the old one is installed. Bob is currently able to run a Java chess program starting from his home directory
/home/bob using the command: java -classpath /test:/home/bob/downloads/*.jar
games.Chess Bob's CLASSPATH is set (at login time) to:
/usr/lib:/home/bob/classes:/opt/java/lib:/opt/java/lib/*.jar What is a possible location for the
Chess.class file?
A. /test/Chess.class
B. /home/bob/Chess.class
C. /test/games/Chess.class
D. /usr/lib/games/Chess.class
E. /home/bob/games/Chess.class
F. inside jarfile /opt/java/lib/Games.jar (with a correct manifest)
G. inside jarfile /home/bob/downloads/Games.jar (with a correct manifest)
Answer: C
certification Oracle certification 1Z0-851 1Z0-851 examen
24.Given:
3. interface Animal { void makeNoise(); }
4. class Horse implements Animal {
5. Long weight = 1200L;
6. public void makeNoise() { System.out.println("whinny"); }
7. }
8. public class Icelandic extends Horse {
9. public void makeNoise() { System.out.println("vinny"); }
10. public static void main(String[] args) {
11. Icelandic i1 = new Icelandic();
12. Icelandic i2 = new Icelandic();
13. Icelandic i3 = new Icelandic();
14. i3 = i1; i1 = i2; i2 = null; i3 = i1;
15. }
16.
}
When line 15 is reached, how many objects are eligible for the garbage collector?A. 0
B. 1
C. 2
D. 3
E. 4
F. 6
Answer: E
Oracle examen 1Z0-851 certification 1Z0-851
25.Click the Exhibit button. Given the fully-qualified class names: com.foo.bar.Dog
com.foo.bar.blatz.Book com.bar.Car com.bar.blatz.Sun Which graph represents the correct directory
structure for a JAR file from which those classes can be used by the compiler and JVM?
A. Jar A
B. Jar B
C. Jar C
D. Jar D
E. Jar E
Answer: A
Oracle certification 1Z0-851 1Z0-851 1Z0-851
NO.2 public String toString() {
NO.3 b.foo();
NO.4 Given:
12. import java.util.*;
13. public class Explorer2 {
14. public static void main(String[] args) {
15. TreeSet<Integer> s = new TreeSet<Integer>();
16. TreeSet<Integer> subs = new TreeSet<Integer>();
17. for(int i = 606; i < 613; i++)
18. if(i%2 == 0) s.add(i);
19. subs = (TreeSet)s.subSet(608, true, 611, true);
20. s.add(629);
21. System.out.println(s + " " + subs);
22. }
23.
}
What is the result?A. Compilation fails.
B. An exception is thrown at runtime.
C. [608, 610, 612, 629] [608, 610]
D. [608, 610, 612, 629] [608, 610, 629]
E. [606, 608, 610, 612, 629] [608, 610]
F. [606, 608, 610, 612, 629] [608, 610, 629]
Answer: E
Oracle examen 1Z0-851 1Z0-851 1Z0-851
NO.5 return 420;
NO.6 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. r, t, t,
B. r, e, o,
C. Compilation fails.
D. An exception is thrown at runtime.
Answer: C
Oracle certification 1Z0-851 certification 1Z0-851 1Z0-851 certification 1Z0-851 certification 1Z0-851
NO.7 Given classes defined in two different files:
1. package util;
2. public class BitUtils {
3. private static void process(byte[] b) {}
4. }
1. package app;
2
. public class SomeApp
{
3. public static void main(String[] args)
{
4. byte[] bytes = new byte[256]
;
5. // insert code here
6.
}
7.
}
What is required at line 5 in class SomeApp to use the process method of BitUtils?A. process(bytes)
;
B. BitUtils.process(bytes)
;
C. app.BitUtils.process(bytes)
;
D. util.BitUtils.process(bytes)
;
E. import util.BitUtils.*; process(bytes)
;
F. SomeApp cannot use the process method in BitUtils.
Answer: F
Oracle 1Z0-851 examen 1Z0-851 1Z0-851 examen 1Z0-851
NO.8 // insert code here
NO.9 }
NO.10 return "<" + wins + "," + losses + ">";
NO.11 }
NO.12 public int hashCode() {
NO.13 }
NO.14 Given:
1. public class Score implements Comparable<Score> {
2. private int wins, losses;
3. public Score(int w, int l) { wins = w; losses = l; }
4. public int getWins() { return wins; }
5. public int getLosses() { return losses; }
NO.15 A programmer has an algorithm that requires a java.util.List that provides an efficient
implementation of add(0, object), but does NOT need to support quick random access. What supports
these requirements.?
A. java.util.Queue
B. java.util.ArrayList
C. java.util.LinearList
D. java.util.LinkedList
Answer: D
Oracle 1Z0-851 1Z0-851 1Z0-851 1Z0-851 1Z0-851
NO.16 String s1 = "123";
NO.17 }
NO.18 Given a pre-generics implementation of a method:
11. public static int sum(List list) {
12. int sum = 0;
13. for ( Iterator iter = list.iterator(); iter.hasNext(); ) {
14. int i = ((Integer)iter.next()).intValue();
15. sum += i;
16. }
17. return sum;
18. }
What three changes allow the class to be used with generics and avoid an unchecked warning? (Choose
three.)
A. Remove line 14.
B. Replace line 14 with "int i = iter.next();".
C. Replace line 13 with "for (int i : intList) {".
D. Replace line 13 with "for (Iterator iter : intList) {".
E. Replace the method declaration with "sum(List<int> intList)".
F. Replace the method declaration with "sum(List<Integer> intList)".
Answer: A,C,F
Oracle 1Z0-851 1Z0-851 examen certification 1Z0-851
NO.19 }
Which method will complete this class?A. public int compareTo(Object o){/*more code here*/
}
B. public int compareTo(Score other){/*more code here*/
}
C. public int compare(Score s1,Score s2){/*more code here*/
}
D. public int compare(Object o1,Object o2){/*more code here*/
}
Answer: B
Oracle examen 1Z0-851 1Z0-851 1Z0-851 examen
6.Given
NO.20 public class Person {
NO.21 private name;
NO.22 this.name = name;
NO.23 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<?>
{
B. public class MinMax<? extends Number>
{
C. public class MinMax<N extends Object>
{
D. public class MinMax<N extends Number>
{
E. public class MinMax<? extends Object>
{
F. public class MinMax<N extends Integer>
{
Answer: D,F
Oracle examen 1Z0-851 1Z0-851 certification 1Z0-851
NO.24 }
Which statement is true?A. The time to find the value from HashMap with a Person key depends on the
size of the map.
B. Deleting a Person key from a HashMap will delete all map entries for all keys of type Person.
C. Inserting a second Person object into a HashSet will cause the first Person object to be
removed as a duplicate.
D. The time to determine whether a Person object is contained in a HashSet is constant and does NOT
depend on the size of the map.
Answer: A
Oracle 1Z0-851 1Z0-851 examen certification 1Z0-851 certification 1Z0-851 1Z0-851
7.Given:
5. import java.util.*;
6. public class SortOf {
7. public static void main(String[] args) {
8. ArrayList<Integer> a = new ArrayList<Integer>();
9. a.add(1); a.add(5); a.add(3);
11. Collections.sort(a);
12. a.add(2);
13. Collections.reverse(a);
14. System.out.println(a);
15. }
16.
}
What is the result?A. [1, 2, 3, 5]
B. [2, 1, 3, 5]
C. [2, 5, 3, 1]
D. [5, 3, 2, 1]
E. [1, 3, 5, 2]
F. Compilation fails.
G. An exception is thrown at runtime.
Answer: C
Oracle certification 1Z0-851 certification 1Z0-851 certification 1Z0-851 1Z0-851
8.Given
11. public interface Status {
12. /* insert code here */ int MY_VALUE = 10;
13. } Which three are valid on line
12?
(Choose three.
)A. final
B. static
C. native
D. public
E. private
F. abstract
G. protected
Answer: A,B,D
Oracle examen 1Z0-851 examen 1Z0-851 certification 1Z0-851 1Z0-851 examen
9.Given:
5. class Atom {
6. Atom() { System.out.print("atom "); }
7. }
8. class Rock extends Atom {
9. Rock(String type) { System.out.print(type); }
10. }
11. public class Mountain extends Rock {
12. Mountain() {
13. super("granite ");
14. new Rock("granite ");
15. }
16. public static void main(String[] a) { new Mountain(); }
17. }
What is the result?
A. Compilation fails.
B. atom granite
C. granite granite
D. atom granite granite
E. An exception is thrown at runtime.
F. atom granite atom granite
Answer: F
Oracle certification 1Z0-851 certification 1Z0-851
10.Click the Exhibit button. Which three statements are true? (Choose three.)
A. Compilation fails.
B. The code compiles and the output is 2.
C. If lines 16, 17 and 18 were removed, compilation would fail.
D. If lines 24, 25 and 26 were removed, compilation would fail.
E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2.
F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1.
Answer: B,E,F
certification Oracle certification 1Z0-851 1Z0-851 1Z0-851 1Z0-851
11.Given:
10. class Line {
11. public class Point { public int x,y;}
12. public Point getPoint() { return new Point(); }
13. }
14. class Triangle {
15. public Triangle() {
16. // insert code here
17. }
18.
}
Which code, inserted at line 16, correctly retrieves a local instance of a Point object?A. Point p =
Line.getPoint()
;
B. Line.Point p = Line.getPoint()
;
C. Point p = (new Line()).getPoint()
;
D. Line.Point p = (new Line()).getPoint()
;
Answer: D
certification Oracle certification 1Z0-851 1Z0-851 certification 1Z0-851 1Z0-851
12.Given:
11. class Alpha {
12. public void foo() { System.out.print("Afoo "); }
13. }
14. public class Beta extends Alpha {
15. public void foo() { System.out.print("Bfoo "); }
16. public static void main(String[] args) {
17. Alpha a = new Beta();
18. Beta b = (Beta)a;
19. a.foo();
NO.25 }
What is the result?
A. Afoo Afoo
B. Afoo Bfoo
C. Bfoo Afoo
D. Bfoo Bfoo
E. Compilation fails.
F. An exception is thrown at runtime.
Answer: D
Oracle examen 1Z0-851 certification 1Z0-851 certification 1Z0-851
13.Click the Exhibit button.
Which statement is true about the classes and interfaces in the exhibit?
A. Compilation will succeed for all classes and interfaces.
B. Compilation of class C will fail because of an error in line 2.
C. Compilation of class C will fail because of an error in line 6.
D. Compilation of class AImpl will fail because of an error in line 2.
Answer: C
Oracle certification 1Z0-851 1Z0-851 1Z0-851 1Z0-851 examen
14.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 = new int[2]{ 100,200 }
;
D. static final int[] a;
static void init() { a = new int[3]; a[0]=100; a[1]=200;
}
Answer: A,B
Oracle examen 1Z0-851 1Z0-851
15.Given:
10. interface Foo { int bar(); }
11. public class Sprite {
12. public int fubar( Foo foo ) { return foo.bar(); }
13. public void testFoo() {
14. fubar(
15. // insert code here
16. );
17. }
18.
}
Which code, inserted at line 15, allows the class Sprite to compile?A. Foo { public int bar() { return 1;
}
B. new Foo { public int bar() { return 1;
}
C. new Foo() { public int bar() { return 1;
}
D. new class Foo { public int bar() { return 1; }
Answer: C
certification Oracle certification 1Z0-851 certification 1Z0-851
16.Given:
1. class Alligator {
2. public static void main(String[] args) {
3. int []x[] = {{1,2}, {3,4,5}, {6,7,8,9}};
4. int [][]y = x;
5. System.out.println(y[2][1]);
6. }
7.
}
What is the result?A. 2
B. 3
C. 4
D. 6
E. 7
F. Compilation fails.
Answer: E
certification Oracle 1Z0-851 1Z0-851 1Z0-851
17.Given:
22. StringBuilder sb1 = new StringBuilder("123");
NO.26 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. Compilation fails.
B. An exception is thrown at runtime.
C. The attribute id in the ItemTest object remains unchanged.
D. The attribute id in the ItemTest object is modified to the new value.
E. A new ItemTest object is created with the preferred value in the id attribute.
Answer: A
Oracle certification 1Z0-851 1Z0-851 examen
NO.27 Given:
13. public class Pass {
14. public static void main(String [] args) {
15. int x = 5;
16. Pass p = new Pass();
17. p.doStuff(x);
18. System.out.print(" main x = " + x);
19. }
20.
21. void doStuff(int x) {
22. System.out.print(" doStuff x = " + x++);
23. }
24.
}
What is the result?A. Compilation fails.
B. An exception is thrown at runtime.
C. doStuff x = 6 main x =
6
D. doStuff x = 5 main x =
5
E. doStuff x = 5 main x =
6
F. doStuff x = 6 main x =
5
Answer: D
Oracle certification 1Z0-851 1Z0-851 1Z0-851 examen
NO.28 // insert code here
NO.29 public Person(String name) {
NO.30 Given:
1. public class GC {
2. private Object o;
3. private void doSomethingElse(Object obj) { o = obj; }
4. public void doSomething() {
5. Object o = new Object();
6. doSomethingElse(o);
7. o = new Object();
8. doSomethingElse(null);
9. o = null;
10. }
11. }
When the doSomething method is called, after which line does the Object created in line 5
become available for garbage collection?
A. Line 5
B. Line 6
C. Line 7
D. Line 8
E. Line 9
F. Line 10
Answer: D
Oracle examen 1Z0-851 1Z0-851
Pour l'instant, vous pouvez télécharger le démo gratuit de Q&A Oracle 1Z0-851 dans Pass4Test pour se former avant le test Oracle 1Z0-851.
没有评论:
发表评论