Given：Which&ensp;command-line&ensp;inv...

单项选择题 Given：

Which command-line invocations will compile？（）

A.javac Mule.java
B.javac -source 1.3 Mule.java
C.javac -source 1.4 Mule.java
D.javac -source 1.5 Mule.java

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1.单项选择题 Given a method that must ensure that its parameter is not null：

What， inserted at line 12， is the appropriate way to handle a null value？（）

A.assert value == null；
B.assert value != null， "value is null"；
C.if （value == null） { throw new AssertionException（"value is null"）； }
D.if （value == null） { throw new IllegalArgumentException（"value is null"）； }

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2.单项选择题 Given：

What is the result？（）

A.An Exception is thrown with no other output
B.B, followed by an Exception.
C.Compilation fails due to an error on line 9.
D.Compilation fails due to an error on line 15.

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3.单项选择题 Given：

What is the result？（）

A.Compilation fails.
B.aAaA aAa AAaa AaA
C.AAaa AaA aAa aAaA
D.AaA AAaa aAaA aAa
E.aAa AaA aAaA AAaa

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4.单项选择题 Given：

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]

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5.多项选择题Given a class whose instances， when found in a collection of objects， are sorted by using the compare To method， which two statements are true？（）

A.The class implements java.lang.Comparable.
B.The class implements java.util.Comparator.
C.The interface used to implement sorting allows this class to define only one sort sequence.
D.The interface used to implement sorting allows this class to define many different sort sequences.

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6.单项选择题 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.Queue
B.java.util.ArrayList
C.java.util.LinearList
D.java.util.LinkedList

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7.多项选择题 Given：

Which two code fragments， inserted independently at line 5， will compile without warnings？（）

A.public void addStrings(List list) {
B.public void addStrings(List<String> list) {
C.public void addStrings(List<? super String> list) {
D.public void addStrings(List<? extends String> list) { B,C

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8.多项选择题 Given：

A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key？（）

A.public int hashCode（）
B.public boolean equals（Key k）
C.public int compareTo（Object o）
D.public boolean equals（Object o）
E.public boolean compareTo（Key k）

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9.单项选择题 Given：

What is the appropriate definition of the hashCode method in class Person？（）

A.return super.hashCode（）；
B.return name.hashCode（） + age * 7；
C.return name.hashCode（） + comment.hashCode（） / 2；
D.return name.hashCode（） + comment.hashCode（） / 2 - age * 3；

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10.单项选择题 Click the Exhibit button.

Which statement is true about the set variable on line 12？（）

A.The set variable contains all six elements from the coll collection， and the order is guaranteed to be preserved.
B.The set variable contains only three elements from the coll collection， and the order is guaranteed to be preserved.
C.The set variable contains all six elements from the coll collection， but the order is NOT guaranteed to be preserved.
D.The set variable contains only three elements from the coll collection， but the order is NOT guaranteed to be preserved.

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