Given that the current directory is empty, and that the user has read and write privileges to the current directory, and the following: Which statement is true?()
A、 Compilation fails.
B、 Nothing is added to the file system.
C、 Only a new file is created on the file system.
D、 Only a new directory is created on the file system.
E、 Both a new file and a new directory are created on the file system.
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Which statements about Java code security are true?()
AThe bytecode verifier loads all classes needed for the execution of a program.
BExecuting code is performed by the runtime interpreter.
CAt runtime the bytecodes are loaded, checked and run in an interpreter.
DThe class loader adds security by separating the namespaces for the classes of the local file system from those imported from network sources.
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11. class Payload { 12. private int weight; 13. public Payload(int wt) { weight = wt; } 13. public void setWeight(mt w) { weight = w; } 15. public String toString { return Integer.toString(weight); } 16. } 17. 18. public class TestPayload { 19. static void changePayload(Payload p) { 20. /* insert code here */ 21. } 22. 23. public static void main(String[] args) { 24. Payload p = new Payload(); 25. p.setWeight(1024); 26. changePayload(p); 27. System.out.println(”The value of p is “+ p); 28. } 29. } Which statement, placed at line 20, causes the code to print “The value of p is 420.”?()
A、 p.setWeight(420);
B、 p.changePayload(420);
C、 p = new Payload(420);
D、 Payload.setWeight(420);
E、 p = Payload.setWeight(420);
F、 p = new Payload(); p.setWeight(420);
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What are four valid examples of polymorphic method calls?()
Ax.a2();
Bz.a2();
Cz.c1();
Dz.a1();
Ey.c1();
Fx.a1();
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What is the result?()
A、 Compilation of class A fails.
B、 Line 28 prints the value 3 to System.out.
C、 Line 28 prints the value 1 to System.out.
D、 A runtime error occurs when line 25 executes.
E、 Compilation fails because of an error on line 28.
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10. interface Foo { int bar(); } 11. public class Sprite { 12. public int fubar( Foo foo) { return foo.bar(); } 13. public void testFoo() { 14. fubar( 15. // insert code here 16.); 17. } 18. } Which code, inserted at line 15, allows the class Sprite to compile?()
A、 Foo { public int bar() { return 1; } }
B、 new Foo { public int bar() { return 1; } }
C、 newFoo() { public int bar(){return 1; } }
D、 new class Foo { public int bar() { return 1; } }