45: SYSTEM PROPERTIES in Java

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45: SYSTEM PROPERTIES
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Given the following code:
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package p1; enum Signal { GET_SET, ON_YOUR_MARKS, GO; } -----------------------------------------------------------package p2; // (1) INSERT IMPORT STATEMENT(S) HERE public class RQ700_50 { public static void main(String[] args) { for(Signal sign : Signalvalues()) { Systemoutprintln(sign); } } }
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Which import statement(s), when inserted at (1), will result in a program that prints the constants of the enum type Signal, when compiled and run Select the one correct answer (a) import static p1Signal*; (b) import p1Signal; (c) import p1*; (d) import p1Signal;
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import static p1Signal*;
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(e) import p1*;
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import static p1*;
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(f) None of the above 45 Given the following code:
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package p3; public class Util { public enum Format { JPEG { public String toString() {return "Jpeggy"; }}, GIF { public String toString() {return "Giffy"; }}, TIFF { public String toString() {return "Tiffy"; }}; } public static <T> void print(T t) { Systemoutprint("|" + t + "|"); } } -----------------------------------------------------------// (1) INSERT IMPORT STATEMENTS HERE public class NestedImportsA { public static void main(String[] args) { Util u = new Util(); Format[] formats = { GIF, TIFF, JPEG, FormatJPEG, UtilFormatJPEG, p3UtilFormatJPEG
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126 }; for (Format fmt : formats) print(fmt); } }
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Which sequence of import statements, when inserted at (1), will result in the code compiling, and the execution of the main() method printing:
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|Giffy||Tiffy||Jpeggy||Jpeggy||Jpeggy||Jpeggy|
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Select the three correct answers (a) import p3Util;
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import import import (b) import import import import (c) import import import (d) import import import p3UtilFormat; static p3Utilprint; static p3UtilFormat*; p3Util; static p3UtilFormat; static p3Utilprint; static p3UtilFormat*; p3*; static p3Util*; static p3UtilFormat*; p3*; p3Util*; static p3UtilFormat*;
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Which statements are true about the import statement Select the two correct answers (a) Static import from a class automatically imports names of static members of any nested types declared in that class (b) Static members of the default package cannot be imported (c) Static import statements must be specified after any type import statements (d) In the case of a name conflict, the name in the last static import statement is chosen (e) A declaration of a name in a compilation unit can shadow a name that is imported
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Given the source file Ajava:
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package topsub; public class A {}
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And the following directory hierarchy:
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/proj |--- src | |--- top | |--- sub | |--- Ajava |--- bin
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45: SYSTEM PROPERTIES
Assuming that the current directory is /proj/src, which of the following statements are true Select the three correct answers (a) The following command will compile, and place the file Aclass under /proj/ bin:
javac -d top/sub/Ajava
(b) The following command will compile, and place the file Aclass under /proj/ bin:
javac -d /proj/bin top/sub/Ajava
(c) The following command will compile, and place the file Aclass under /proj/ bin:
javac -D /proj/bin /top/sub/Ajava
(d) The following command will compile, and place the file Aclass under /proj/ bin:
javac -d /bin top/sub/Ajava
(e) After successful compilation, the absolute pathname of the file Aclass will be:
/proj/bin/Aclass
(f) After successful compilation, the absolute pathname of the file Aclass will be:
/proj/bin/top/sub/Aclass
Given the following directory structure:
/top |--- wrk |--- pkg |--- Ajava |--- Bjava
Assume that the two files Ajava and Bjava contain the following code, respectively:
// Filename: Ajava package pkg; class A { B b; } // Filename: Bjava package pkg; class B {}
For which combinations of current directory and command is the compilation successful Select the two correct answers (a) Current directory: /top/wrk
Command: javac -cp :pkg Ajava
(b) Current directory: /top/wrk
Command: javac -cp pkg/Ajava
(c) Current directory: /top/wrk
Command: javac -cp pkg Ajava
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(d) Current directory: /top/wrk
Command: javac -cp :pkg pkg/Ajava
(e) Current directory: /top/wrk/pkg
Command: javac Ajava
(f) Current directory: /top/wrk/pkg
Command: javac -cp Ajava
Given the following directory structure:
/proj |--- src | |--- Aclass | | |--- bin |--- top |--- sub |--- Aclass
Assume that the current directory is /proj/src Which classpath specifications will find the file Aclass for the class topsubA Select the two correct answers (a) -cp /top/bin/top (b) -cp /top/bin/top/sub (c) -cp /top/bin/top/sub/Aclass (d) -cp /bin; (e) -cp /top (f) -cp /top/bin 410 Given that the name of the class MyClass is specified correctly, which commands are syntactically valid: Select the two correct answers (a) java -Ddebug=true MyClass (b) java -ddebug=true MyClass (c) java -Ddebug="true" MyClass (d) java -D debug=true MyClass 411 Which statement is true Select the one correct answer (a) A JAR file can only contain one package (b) A JAR file can only be specified for use with the java command, in order to run a program (c) The classpath definition of the platform overrides any entries specified in the