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单选题
package com.sun.sjcp； public class Commander{ public static void main（String[]args）{ //more code here } } Assume that the class fileis located in /foo/com/sun/sjcp/，the current directory is/foo/，and that the classpath contains“.“（current directory）. Which command line correctly runs Commander？（）
A
java Commander
B
java com.sim.sjcp.Commander
C
java com/sun/sjcp/Commander
D
java-cpcom.sun.sjcp Commander
E
java-cpcom/sun/sjcp Commander
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public class Base { public static final String FOO = “foo”； public static void main（String[] args） { Base b = new Base（）； Sub s = new Sub（）； System.out.print（Base.FOO）； System.out.print（Sub.FOO）； System.out.print（b.FOO）； System.out.print（s.FOO）； System.out.print（（（Base）s）.FOO）； } } class Sub extends Base {public static final String FOO=bar；} What is the result？（） A、 foofoofoofoofooB、 foobarfoobarbarC、 foobarfoofoofooD、 foobarfoobarfooE、 barbarbarbarbarF、 foofoofoobarbarG、 foofoofoobarfoo
考题
class One { void foo（） {} } class Two extends One { //insert method here } Which three methods， inserted individually at line 14， will correctly complete class Two？（）A、 int foo（） { /* more code here */ }B、 void foo（） { /* more code here */ }C、 public void foo（） { /* more code here */ }D、 private void foo（） { /* more code here */ }E、 protected void foo（） { /* more code here */ }
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考题
public class Test { public static void main （String args） { class Foo { public int i = 3； } Object o = （Object） new Foo（）； Foo foo = （Foo）o； System.out.printIn（foo. i）； } } What is the result？（） A、 Compilation will fail.B、 Compilation will succeed and the program will print “3”C、 Compilation will succeed but the program will throw a ClassCastException at line 6.D、 Compilation will succeed but the program will throw a ClassCastException at line 7.
考题
public class Foo { static int[] a； static { a[0]=2； } public static void main（ String[] args） {} } Which exception or error will be thrown when a programmer attempts to run this code？（） A、 java.lang. StackOverflowErrorB、 java.lang.IllegalStateExceptionC、 java.lang.ExceptionlnlnitializerErrorD、 java.lang.ArraylndexOutOfBoundsException
考题
package com.company.application； public class MainClass { public static void main（String[] args） { } } And MainClass exists in the /apps/com/company/application directory. Assume the CLASSPATH environment variable is set to “.“ （current directory）. Which two java commands entered at the command line will run MainClass？（）A、 java MainClass if run from the /apps directoryB、 java com.company.application.MainClass if run from the /apps directoryC、 java -classpath /apps com.company.application.MainClass if run from any directoryD、 java -classpath . MainClass if run from the /apps/com/company/application directoryE、 java -classpath /apps/com/company/application：. MainClass if run from the /apps directoryF、 java com.company.application.MainClass if run from the /apps/com/company/application directory
考题
public class Test { public static void main（String args[]） { class Foo { public int i = 3； } Object o = （Object）new Foo（）； Foo foo = （Foo）o； System.out.println（“i = “ + foo.i）； } } What is the result？（） A、 i = 3B、 Compilation fails.C、 A ClassCastException is thrown at line 6.D、 A ClassCastException is thrown at line 7.
考题
Given a correctly compiled class whose source code is： package com.sun.sjcp； public class Commander { public static void main（String[] args） { // more code here } } Assume that the class file is located in /foo/com/sun/sjcp/， the current directory is /foo/， and that the classpath contains “.“ （current directory）. Which command line correctly runs Commander？（） A、 java CommanderB、 java com. sim. sjcp.CommanderC、 java com/sun/sjcp/CommanderD、 java -cp com.sun.sjcp CommanderE、 java -cp com/sun/sjcp Commander
考题
public class Foo { public static void main（String[] args） { try { return； } finally { System.out.println（ “Finally” ）； } } } What is the result？（）A、 FinallyB、 Compilation fails.C、 The code runs with no output.D、 An exception is thrown at runtime.
考题
Given the following code, write a line of code that, when inserted at the indicated location, will make the overriding method in Extension invoke the overridden method in class Base on the current object. class Base { public void print（ ） { System.out.println("base"); } } class Extention extends Base { public void print（ ） { System.out.println("extension"); // insert line of implementation here } } public class Q294d { public static void main(String args[]) { Extention ext = new Extention（ ）; ext.print（ ）; } } Fill in a single line of implementation.（）
考题
10. interface Foo {} 11. class Alpha implements Foo {} 12. class Beta extends Alpha {} 13. class Delta extends Beta { 14. public static void main（ String[] args） { 15. Beta x = new Beta（）； 16. // insert code here 17. } 18. } Which code， inserted at line 16， will cause a java.lang.ClassCastException？（） A、 Alpha a = x；B、 Foo f= （Delta）x；C、 Foo f= （Alpha）x；D、 Beta b = （Beta）（Alpha）x；
考题
Given： 10. class One { 11. void foo（） { } 12. } 13. class Two extends One { 14. //insert method here 15. } Which three methods， inserted individually at line 14， will correctly complete class Two？（）A、 public void foo（） { /* more code here */ }B、 private void foo（） { /* more code here */ }C、 protected void foo（） { /* more code here */ }D、 int foo（） { /* more code here */ } E、 void foo（） { /* more code here */ }
考题
单选题public class Test { public static void main （String args） { class Foo { public int i = 3； } Object o = （Object） new Foo（）； Foo foo = （Foo）o； System.out.printIn（foo. i）； } } What is the result？（）A
Compilation will fail.B
Compilation will succeed and the program will print “3”C
Compilation will succeed but the program will throw a ClassCastException at line 6.D
Compilation will succeed but the program will throw a ClassCastException at line 7.
考题
单选题Given a correctly compiled class whose source code is： package com.sun.sjcp； public class Commander { public static void main（String[] args） { // more code here } } Assume that the class file is located in /foo/com/sun/sjcp/， the current directory is /foo/， and that the classpath contains “.“ （current directory）. Which command line correctly runs Commander？（）A
java CommanderB
java com. sim. sjcp.CommanderC
java com/sun/sjcp/CommanderD
java -cp com.sun.sjcp CommanderE
java -cp com/sun/sjcp Commander
考题
单选题package com.sun.sjcp； public class Commander{ public static void main（String[]args）{ //more code here } } Assume that the class fileis located in /foo/com/sun/sjcp/，the current directory is/foo/，and that the classpath contains“.“（current directory）. Which command line correctly runs Commander？（）A
java CommanderB
java com.sim.sjcp.CommanderC
java com/sun/sjcp/CommanderD
java-cpcom.sun.sjcp CommanderE
java-cpcom/sun/sjcp Commander
考题
单选题public class Test { public static void main（String args[]） { class Foo { public int i = 3； } Object o = （Object）new Foo（）； Foo foo = （Foo）o； System.out.println（“i = “ + foo.i）； } } What is the result？（）A
i = 3B
Compilation fails.C
A ClassCastException is thrown at line 6.D
A ClassCastException is thrown at line 7.
考题
单选题public class Foo { public static void main（String[] args） { try { return； } finally { System.out.println（ “Finally” ）； } } } What is the result？（）A
FinallyB
Compilation fails.C
The code runs with no output.D
An exception is thrown at runtime.
考题
多选题class One { void foo（） {} } class Two extends One { //insert method here } Which three methods， inserted individually at line 14， will correctly complete class Two？（）Aint foo（） { /* more code here */ }Bvoid foo（） { /* more code here */ }Cpublic void foo（） { /* more code here */ }Dprivate void foo（） { /* more code here */ }Eprotected void foo（） { /* more code here */ }
考题
单选题public class Foo { static int[] a； static { a[0]=2； } public static void main（ String[] args） {} } Which exception or error will be thrown when a programmer attempts to run this code？（）A
java.lang. StackOverflowErrorB
java.lang.IllegalStateExceptionC
java.lang.ExceptionlnlnitializerErrorD
java.lang.ArraylndexOutOfBoundsException
考题
单选题public class Test { public static void main （String [] args） { string foo = “blue”； string bar = foo； foo = “green”； System.out.printIn（bar）； } } What is the result？（）A
An exception is thrown.B
The code will not compile.C
The program prints “null”D
The program prints “blue”E
The program prints “green”
考题
单选题public class Base { public static final String FOO = “foo”； public static void main（String[] args） { Base b = new Base（）； Sub s = new Sub（）； System.out.print（Base.FOO）； System.out.print（Sub.FOO）； System.out.print（b.FOO）； System.out.print（s.FOO）； System.out.print（（（Base）s）.FOO）； } } class Sub extends Base {public static final String FOO=bar；} What is the result？（）A
foofoofoofoofooB
foobarfoobarbarC
foobarfoofoofooD
foobarfoobarfooE
barbarbarbarbarF
foofoofoobarbarG
foofoofoobarfoo
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