IT領域での主要な問題が質と実用性が欠くということを我々ははっきり知っています。JPexamのOracleの1Z0-851の試験問題と解答はあなたが必要とした一切の試験トレーニング資料を準備して差し上げます。実際の試験のシナリオと一致で、选択問題（多肢選択問題）はあなたが試験を受かるために有効な助けになれます。JPexamのOracleの1Z0-851の試験トレーニング資料は検証した試験資料で、JPexamの専門的な実践経験に含まれています。
Oracleの1Z0-851認定試験を受験する気があるのですか。この試験を受けた身の回りの人がきっと多くいるでしょう。これは非常に大切な試験で、試験に合格して1Z0-851認証資格を取ると、あなたは多くのメリットを得られますから。では、他の人を頼んで試験に合格する対策を教えてもらったのですか。試験に準備する方法が色々ありますが、最も高効率なのは、きっと良いツールを利用することですね。ところで、あなたにとってどんなツールが良いと言えるのですか。もちろんJPexamの1Z0-851問題集です。
試験番号：1Z0-851問題集
試験科目：Java Standard Edition 6 Programmer Certified Professional Exam
最近更新時間：2013-12-28
問題と解答：全290問
100％の返金保証。1年間の無料アップデート。
1Z0-851認定試験に関連する参考資料を提供できるサイトが多くあります。しかし、資料の品質が保証されることができません。それと同時に、あなたに試験に失敗すれば全額返金という保障を与えることもできません。普通の参考資料と比べて、JPexamの1Z0-851問題集は最も利用に値するツールです。JPexamの指導を元にして、あなたは試験の準備を十分にすることができます。しかも、楽に試験に合格することができます。IT領域でより大きな進歩を望むなら、1Z0-851認定試験を受験する必要があります。IT試験に順調に合格することを望むなら、JPexamの1Z0-851問題集を使用する必要があります。
「あきらめたら そこで試合終了ですよ」という『スラムダンク』の中の安西監督が言った名言があります。この文は人々に知られています。試合と同じ、試験もそのどおりですよ。試験に準備する時間が十分ではないから、1Z0-851認定試験を諦めた人がたくさんいます。しかし、優秀な資料を利用すれば、短時間の準備をしても、高得点で試験に合格することができます。信じないでしょうか。JPexamの試験問題集はそのような資料ですよ。はやく試してください。
購入前にお試し,私たちの試験の質問と回答のいずれかの無料サンプルをダウンロード：http://www.jpexam.com/1Z0-851_exam.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 1Z0-851 1Z0-851 1Z0-851認定資格
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過去問 1Z0-851 1Z0-851問題集
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参考書 1Z0-851 1Z0-851認証試験 1Z0-851
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 1Z0-851認定証 1Z0-851認定資格 1Z0-851過去問
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参考書 1Z0-851練習問題 1Z0-851練習問題 1Z0-851問題集 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問題集 1Z0-851 1Z0-851参考書 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
Oracle認定資格 1Z0-851 1Z0-851 1Z0-851 1Z0-851練習問題
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問題集 1Z0-851 1Z0-851 1Z0-851練習問題
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認定試験 1Z0-851 1Z0-851 1Z0-851
NO.2 // insert code here
NO.3 b.foo();
NO.4 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練習問題 1Z0-851認定資格 1Z0-851 1Z0-851認定証 1Z0-851認証試験
NO.5 }
NO.6 return "<" + wins + "," + losses + ">";
NO.7 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練習問題 1Z0-851認証試験 1Z0-851過去問 1Z0-851
NO.8 String s1 = "123";
NO.9 }
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認定資格 1Z0-851認定試験 1Z0-851認証試験 1Z0-851認定証 1Z0-851問題集
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練習問題 1Z0-851 1Z0-851過去問 1Z0-851認定証
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認定資格 1Z0-851参考書 1Z0-851認証試験 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
Oracle 1Z0-851 1Z0-851 1Z0-851認証試験
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
Oracle問題集 1Z0-851 1Z0-851過去問 1Z0-851認定試験
17.Given:
22. StringBuilder sb1 = new StringBuilder("123");
NO.10 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問題集 1Z0-851 1Z0-851認定資格
NO.11 public String toString() {
NO.12 }
NO.13 return 420;
NO.14 public class Person {
NO.15 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 1Z0-851認定資格 1Z0-851認定資格 1Z0-851問題集 1Z0-851
NO.16 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 1Z0-851 1Z0-851認定資格 1Z0-851認定証 1Z0-851
NO.17 }
NO.18 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.19 private name;
NO.20 }
NO.21 }
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参考書 1Z0-851参考書 1Z0-851 1Z0-851
6.Given
NO.22 public int hashCode() {
NO.23 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認定試験 1Z0-851参考書 1Z0-851認証試験 1Z0-851参考書 1Z0-851問題集
NO.24 this.name = name;
NO.25 // insert code here
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過去問 1Z0-851問題集 1Z0-851 1Z0-851参考書
NO.27 public Person(String name) {
NO.28 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過去問 1Z0-851参考書 1Z0-851
NO.29 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認定資格 1Z0-851
NO.30 }
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認定試験 1Z0-851 1Z0-851 1Z0-851認定試験 1Z0-851認証試験
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 1Z0-851 1Z0-851参考書 1Z0-851認定証 1Z0-851認証試験
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過去問 1Z0-851認証試験 1Z0-851 1Z0-851認定資格 1Z0-851
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認定証 1Z0-851認証試験 1Z0-851 1Z0-851 1Z0-851認定試験
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
Oracle 1Z0-851 1Z0-851認証試験 1Z0-851認定資格 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
Oracle 1Z0-851 1Z0-851認定資格 1Z0-851認定証
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();
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