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Q81. Given: What is the result? 

A. false false 

B. true false 

C. true true 

D. Compilation fails 

E. An exception is thrown at runtime 

Answer:

Explanation: 

(this == obj) is the object implementation of equals() and therefore FALSE, if the reference 

points to variousobjectsand then the super.equals() is invoked, the object method equals() 

what still result in FALSEbetter override of equals() is to compare the attributes like: 

public boolean equals (Object obj) { 

if (obj != null){ 

Product p = (Product)obj; 

return this.id == p.id; 

return false; 


Q82. View the exhibit: 

Given the code fragment: 

What is the result? 

A. Compilation fails 

B. 6 

C. 4 

D. 1 

E. 3 

F. Not possible to answer due to missing exhibit. 

Answer:

Explanation: 

C: 4 Falls ge.ndert zu: return FileVisitResult.CONTINUEsonst A: weil CONTINUE als Konstante unbekannt Note: TheFileSystems.getDefault() returns the default FileSystem. The default file system creates objects thatprovide access to the file systems accessible to the Java virtual machine. The working directory of the filesystem is the current user directory, named by the system property user.dir. 


Q83. Given: Which of the four are valid modifications to synchronize access to the valid list between threads t1 and t2? 

A. Replace line 1 with: 

Synchronized (t2) (t1.start();) synchronized(t1) (t2.start(); ) 

korrekte Schreibweise: synchronized (t2) {t1.start();} synchronized(t1) { t2.start();} 

B. Replace Line 2 with: 

static CopyWriteArrayList<Integer> list = new CopyWriteArrayList<>(); 

korrekte Schreibweise: static CopyOnWriteArrayList<Integer> list = new 

CopyOnWriteArrayList<>(); 

C. Replace line 3 with: 

synchronized public static void addItem () { 

korrekte Schreibweise: synchronized public static void addItem () { 

D. Replace line 4 with: 

synchronized (list) (list.add(1);) 

korrekte Schreibweise: synchronized (list) { (list.add(1); } 

E. Replace line 5 with: 

Synchronized public void run () { 

korrekte Schreibweise: synchronized public void run () { 

F. replace line 6 with: 

Synchronized (this) {for (in i = 0, i<5000, i++) WorkPool.addItem(); } 

korrekte Schreibweise: synchronized (this) {for (int i = 0; i<500; i++) WorkPool.addItem(); } 

G. Replace line 6 with: 

synchronized (bar) {for (int i= 0; i<5000; i++) WorkPool.addItem(); } 

korrekte Schreibweise: synchronized (bar) {for (int i= 0; i<500; i++) WorkPool.addItem(); } 

Answer: B,C,D 

Explanation: 

Away to create synchronized code is with synchronized statements. 

Unlike synchronized methods, synchronized statements must specify the object that 

provides theintrinsic lock: 

For example: 

public void addName(String name) { 

synchronized(this) { 

lastName = name; 

nameCount++; 

nameList.add(name); 

In this example, the addName method needs to synchronize changes to lastName and 

nameCount, but alsoneeds to avoid synchronizing invocations of other objects' methods. 

Without synchronized statements, therewould have to be a separate, unsynchronized 

method for the sole purpose of invoking nameList.add. 

Reference: The Java Tutorial,Intrinsic Locks and Synchronization 


Q84. Given: 

What is the result? 

A. false \sales\quarter\ . . \qtrlreport.txt 

B. false \quarter\ . . \qtrlreport.txt 

C. true . . \ . . \ . . \ annualreport.txt 

D. true \ . . \ . . \annualreport.txt 

Answer:

Explanation: 

( richtig !! import java.nio.file.Path; import java.nio.file.Paths; ) original-Aufgabe war ( falsch >> import java.io.file.Path; import java.io.file.Paths; ) The relativize method that can be used to construct a relative path between two paths. relativize Path relativize(Path other) Constructs a relative path between this path and a given path. Parameters:other - the path to relativize against this path Returns:the resulting relative path, or an empty path if both paths are equal Note: Relativization is the inverse of resolution. This method attempts to construct a relative path that when resolvedagainst this path, yields a path that locates the same file as the given path. For18example, on UNIX, if this path is "/a/b" and the given path is "/a/b/c/d" then the resulting relative path would be"c/d". Where this path and the given path do not have a root component, then a relative path can beconstructed. A relative path cannot be constructed if only one of the paths have a root component. Where bothpaths have a root component then it is implementation dependent if a relative path can be constructed. If thispath and the given path are equal then an empty path is returned. For any two normalized paths p and q, where q does not have a root component,p.relativize(p.resolve(q)).equals(q) When symbolic links are supported, then whether the resulting path, when resolved against this path, yields apath that can be used to locate the same file as other is implementation dependent. For example, if this path is"/a/b" and the given path is "/a/x" then the resulting relative path may be "../x". If "b" is a symbolic link then isimplementation dependent if "a/b/../x" would locate the same file as "/a/x". 


Q85. Given: What is the result? 

A. woof arf 

B. woof woof 

C. arf arf 

D. A RuntimeException is generated 

E. The code fails to compile 

Answer:

Explanation: 

class Dog { 

protected String bark() 

public class Beagle extends Dog { 

private String bark() 

Cannot reduce the visibility of the inherited method from Dog 


Q86. Given the class? 

What is the result? 

A. Jane Doe John Doe Joe Shmoe 

B. John Doe Jane Doe Joe Shmoe 

C. Joe Shmoe John Doe Jane Doe 

D. Joe Shmoe Jane Doe John Doe 

E. Jane Doe Joe Shmoe John Doe 

F. John Doe Joe Shmoe Jane Doe 

Answer:

Explanation: The list will be sorted alphabetically (Lastname / Firstname). first sorted by Lastname if Lastname equals, sorted by firstname Output will be: Jane Doe John Doe Joe Shmoe 


Q87. Which code fragment demonstrates the proper way to handle JDBC resources? 

A. try { 

ResultSet rs = stmt.executeQuery (query); 

statement stmt = con.createStatement(); 

while (rs.next()) (/* . . . */) 

} catch (SQLException e) {} 

B. try { 

Statement stmt = con.createStatement(); 

ResultSet rs = stmt.executeQuery (query); 

while (rs.next()) (/* . . . */) 

} catch (SQLException e) {} 

C. try { 

Statement stmt = con.createStatement(); 

ResultSet rs = stmt.executeQuery (query); 

while (rs.next()) (/* . . . */) 

} finally { 

rs.close(); 

stmt.close(); 

D. try { 

ResultSet rs = stmt.executeQuery (query); 

Statement stmt = con.createStatement(); 

while (rs.next()) (/* . . . */) 

} finally { 

rs.close(); 

stmt.close(); 

Answer:


Q88. Given two classes in separate files: 

Which two import statements can make the a.b.parent class compliable? 

A. import a.b.c.Parent; 

B. import a.b.c.Child; 

C. import a.b.c.*; 

D. import a.b.*; 

E. import a.*; 

Answer: B,C 

Explanation: 

To import a specific member into the current file, put an import statement at the beginning of thefile before any type definitions but after the package statement, if there is one.C:To import all the types contained in a particular package, use the import statement with the asterisk (*)wildcard character. 

Reference: The Java Tutorials,Using Package Members 


Q89. Given this error message when running your application: 

Exception in thread "main" java.util.MissingResourceException: Can't find bundle for base name 

MessageBundle, locale 

And given that the MessageBundle.properties file has been created, exists on your disk, and is properlyformatted. 

What is the cause of the error message? 

A. The file is not in the environment path. 

B. The file is not in the classpath. 

C. The file is not in the javapath. 

D. You cannot use a file to store a ResourceBundle. 

Answer:

Explanation: 

ResourceBundle.getBundle is using a resource name; it isn't called ResourceBundle for 

nothing. 

You can create a custom ClassLoader and use that to load the data. 


Q90. Given this code fragment: 

Assume that the SQL query returns records. 

What is the result? 

A. Compilation fails due to error at line 17 

B. The program prints Error 

C. The program prints each record 

D. Compilation fails at line 14 

Answer: