Given the following interface declaration, which declaration is valid in Java

Generation QR Code in Java Given the following interface declaration, which declaration is valid
Given the following interface declaration, which declaration is valid
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interface I { void setValue(int val); int getValue(); }
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Select the one correct answer (a) class A extends I {
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int value; void setValue(int val) { value = val; } int getValue() { return value; } }
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(b) interface B extends I {
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void increment(); }
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APPENDIX F
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(c) abstract class C implements I {
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int getValue() { return 0; } abstract void increment(); }
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(d) interface D implements I {
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void increment(); } (e) class E implements I { int value; public void setValue(int val) { value = val; } }
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Which statements are true about the methods notify() and notifyAll() Select the two correct answers (a) An instance of the class Thread has a method named notify that can be invoked (b) A call to the method notify() will wake the thread that currently owns the lock of the object (c) The method notify() is synchronized (d) The method notifyAll() is defined in the class Thread (e) When there is more than one thread waiting to obtain the lock of an object, there is no way to be sure which thread will be notified by the notify() method
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Which statements are true about the correlation between the inner and outer instances of member classes Select the two correct answers (a) Fields of the outer instance are always accessible to inner instances, regardless of their accessibility modifiers (b) Fields of the outer instance can never be accessed using only the variable name within the inner instance (c) More than one inner instance can be associated with the same outer instance (d) All variables from the outer instance that should be accessible in the inner instance must be declared final (e) A class that is declared final cannot have any member classes
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What will be the result of attempting to compile and run the following code
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public class Q6b0c { public static void main(String[] args) { int i = 4; float f = 43; double d = 18; int c = 0; if (i == f) c++; if (((int) (f + d)) == ((int) f + (int) d)) c += 2; Systemoutprintln(c); } }
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APPENDIX F
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Select the one correct answer (a) (b) (c) (d) (e) Q46 The code will fail to compile The value 0 will be written to the standard output The value 1 will be written to the standard output The value 2 will be written to the standard output The value 3 will be written to the standard output
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Which operators will always evaluate all the operands Select the two correct answers (a) || (b) + (c) && (d) : (e) %
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Which statement concerning the switch construct is true Select the one correct answer (a) (b) (c) (d) (e) All switch statements must have a default label There must be exactly one label for each code segment in a switch statement The keyword continue can never occur within the body of a switch statement No case label may follow a default label within a single switch statement A character literal can be used as a value for a case label
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Given the following code:
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public class Q600_90 { public static void main(String[] args) { Scanner lexer = new Scanner("Treat!"); if(lexerhasNext("\\w+")) { // (1) } else lexernext(); // (2) lexerclose(); // (3) } }
Where in the program can we independently insert the following print statement:
Systemoutprint(lexernext());
in order for the program to compile and print the following output when run:
Treat!
Select the one correct answer (a) Insert the print statement at (1) only (b) Insert the print statement at (2) only (c) Insert the print statement at (3) only (d) None of the above
APPENDIX F
Which of the following expressions are valid Select the three correct answers (a) SystemouthashCode() (b) ""hashCode() (c) 42hashCode() (d) ("4"+2)equals(42) (e) (new javautilArrayList<String>())hashCode()