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3. Given the following,
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1. 2. 3. 4. 5. 6. 7. 8. 9. abstract class A { abstract short m1() ; short m2() { return (short) 420; } } abstract class B extends A { // missing code short m1() { return (short) 42; } }
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which three of the following statements are true (Choose three.)
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A. The code will compile with no changes. B. Class B must either make an abstract declaration of method m2() or implement method m2() to allow the code to compile. C. It is legal, but not required, for class B to either make an abstract declaration of method m2() or implement method m2() for the code to compile. D. As long as line 8 exists, class A must declare method m1() in some way. E. If line 6 were replaced with class B extends A { the code would compile. F.
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If class A was not abstract and method m1() on line 2 was implemented, the code would not compile.
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4. Which two of the following are legal declarations for nonnested classes and interfaces (Choose two.) A. final abstract class Test {} B. public static interface Test {} C. final public class Test {} D. protected abstract class Test {} E. protected interface Test {} F.
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abstract public class Test {}
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5. How many of the following are legal method declarations
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1 2 3 4 5 6 protected abstract void m1(); static final void m1(){} transient private native void m1() {} synchronized public final void m1() {} private native void m1(); static final synchronized protected void m1() {}
A. 1 B. 2 C. 3 D. 4 E. 5 F.
All of them
2: Declarations and Access Control
6. Given the following,
1. 2. 3. 4. 5. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. package testpkg.p1; public class ParentUtil { public int x = 420; protected int doStuff() { return x; } } package testpkg.p2; import testpkg.p1.ParentUtil; public class ChildUtil extends ParentUtil { public static void main(String [] args) { new ChildUtil().callStuff(); } void callStuff() { System.out.print("this " + this.doStuff() ); ParentUtil p = new ParentUtil(); System.out.print(" parent " + p.doStuff() ); } }
which statement is true
A. The code compiles and runs, with output this 420 parent 420. B. If line 8 is removed, the code will compile and run. C. If line 10 is removed, the code will compile and run. D. Both lines 8 and 10 must be removed for the code to compile. E. An exception is thrown at runtime.
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7. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. interface Count { short counter = 0; void countUp(); } public class TestCount implements Count { public static void main(String [] args) { TestCount t = new TestCount(); t.countUp(); }
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11. 12. 13. 14. 15. 16.
public void countUp() { for (int x = 6; x>counter; x--, ++counter) { System.out.print(" " + counter); } } }
what is the result
A. 0 1 2 B. 1 2 3 C. 0 1 2 3 D. 1 2 3 4 E. Compilation fails F.
An exception is thrown at runtime
8. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. import java.util.*; public class NewTreeSet2 extends NewTreeSet { public static void main(String [] args) { NewTreeSet2 t = new NewTreeSet2(); t.count(); } } protected class NewTreeSet { void count() { for (int x = 0; x < 7; x++,x++ ) { System.out.print(" " + x); } } }
what is the result
A. 0 2 4 B. 0 2 4 6 C. Compilation fails at line 4 D. Compilation fails at line 5 E. Compilation fails at line 8 F.
Compilation fails at line 10
2: Declarations and Access Control
9. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. public class NewTreeSet extends java.util.TreeSet{ public static void main(String [] args) { java.util.TreeSet t = new java.util.TreeSet(); t.clear(); } public void clear() { TreeMap m = new TreeMap(); m.clear(); } }
which two statements, added independently at line 1, allow the code to compile (Choose two.)
A. No statement is required B. import java.util.*; C. import.java.util.Tree*; D. import java.util.TreeSet; E. import java.util.TreeMap; 10. Which two are valid declarations within an interface (Choose two.) A. public static short stop = 23; B. protected short stop = 23; C. transient short stop = 23; D. final void madness(short stop); E. public Boolean madness(long bow); F.
static char madness(double duty);
11. Which of the following class level (nonlocal) variable declarations will not compile A. protected int a; B. transient int b = 3; C. public static final int c; D. volatile int d; E. private synchronized int e;
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