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1z0-851 问题列表
问题
单选题Given: What is the result?（）A
CanadaB
null CanadaC
Canada nullD
Canada CanadaE
Compilation fails due to an error on line 26.F
Compilation fails due to an error on line 29.
问题
单选题Given: Which code, inserted at line 15, creates an instance of the Point class defined in Line?（）A
Point p = new Point();B
Line.Point p = new Line.Point();C
The Point class cannot be instatiated at line 15.D
Line l = new Line() ; l.Point p = new l.Point();
问题
单选题A team of programmers is involved in reviewing a proposed design for a new utility class. After some discussion, they realize that the current design allows other classes to access methods in the utility class that should be accessible only to methods within the utility class itself. What design issue has the team discovered?（）A
Tight couplingB
Low cohesionC
High cohesionD
Loose couplingE
Weak encapsulationF
Strong encapsulation
问题
单选题Given: What is the result?（）A
Compilation fails.B
An exception is thrown at runtime.C
[608, 609, 610, 612] [608, 610]D
[608, 609, 610, 612] [608, 609, 610]E
[606, 608, 609, 610, 612] [608, 610]F
[606, 608, 609, 610, 612] [608, 609, 610]
问题
单选题Given: What is the result?（）A
nullB
finallyC
null finallyD
Compilation fails.E
finally exception
问题
单选题Given: What is the result?（）A
Compilation fails because of an error in line 7.B
Compilation fails because of an error in line 9.C
If you define D e = new E(), then e.bMethod() invokes the version of bMethod() defined in Line 5.D
If you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 5.E
If you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 9.
问题
单选题Given: What is the result?（）A
w-fB
f-p w-fC
w-f b-fD
f-p w-f b-fE
Compilation fails.F
An exception is thrown at runtime.
问题
多选题Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object?（）AWhen using versions of Java technology earlier than 5.0.BWhen sharing a StringBuffer among multiple threads.CWhen using the java.io class StringBufferInputStream.DWhen you plan to reuse the StringBuffer to build more than one string.
问题
多选题A developer is creating a class Book, that needs to access class Paper. The Paper class is deployed in a JAR named myLib.jar. Which three, taken independently, will allow the developer to use the Paper class while compiling the Book class?（）AThe JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.BThe JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar..CThe JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class.DThe JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar.EThe JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -cp /foo/myLib.jar/Paper Book.java.FThe JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -d /foo/myLib.jar Book.javaGThe JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -classpath /foo/myLib.jar Book.java
问题
多选题Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object?（）AWhen using versions of Java technology earlier than 5.0.BWhen sharing a StringBuffer among multiple threads.CWhen using the java.io class StringBufferInputStream.DWhen you plan to reuse the StringBuffer to build more than one string.
问题
单选题Given: What is the result?（）A
2B
3C
12D
23E
123F
Compilation fails.G
An exception is thrown at runtime.
问题
单选题A company that makes Computer Assisted Design (CAD) software has, within its application, some utility classes that are used to perform 3D rendering tasks. The company's chief scientist has just improved the performance of one of the utility classes' key rendering algorithms, and has assigned a programmer to replace the old algorithm with the new algorithm. When the programmer begins researching the utility classes, she is happy to discover that the algorithm to be replaced exists in only one class. The programmer reviews that class's API, and replaces the old algorithm with the new algorithm, being careful that her changes adhere strictly to the class's API. Once testing has begun, the programmer discovers that other classes that use the class she changed are no longer working properly. What design flaw is most likely the cause of these new bugs?（）A
InheritanceB
Tight couplingC
Low cohesionD
High cohesionE
Loose couplingF
Object immutability
问题
单选题Given: When the doSomething method is called, after which line does the Object created in line 5 become available for garbage collection?（）A
Line 5B
Line 6C
Line 7D
Line 8E
Line 9F
Line 10
问题
单选题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.QueueB
java.util.ArrayListC
java.util.LinearListD
java.util.LinkedList
问题
单选题Given: What is the result?（）A
peepB
barkC
meowD
Compilation fails.E
An exception is thrown at runtime.