单项选择题

int x = 3; 
int y = 1; 
if (x = y) { 
System.out.println(“x = “ + x); 
} 
What is the result? ()

A.x=1
B.x=3
C.Compilation fails.
D.The code runs with no output. 
E.An exception is thrown at runtime.


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2.单项选择题

int i = 1,j = 10; 
do { 
if(i>j) { 
break; 
}
j--; 
} while (++i <5); 
System.out.println(“i =” +i+” and j = “+j);
What is the result?()

A. i = 6 and j = 5
B. i = 5 and j = 5
C. i = 6 and j = 4
D. i = 5 and j = 6
E. i = 6 and j = 6

3.多项选择题

class A { 
A() { } 
} 
class B extends A { 
} 
Which two statements are true?()

A. Class B’s constructor is public.
B. Class B’s constructor has no arguments.
C. Class B’s constructor includes a call to this().
D. Class B’s constructor includes a call to super().

6.多项选择题Which two cause a compiler error?() 

A. float[] = new float(3);
B. float f2[] = new float[];
C. float[] f1 = new float[3];
D. float f3[] = new float[3];
E. float f5[] = { 1.0f, 2.0f, 2.0f };
F. float f4[] = new float[] { 1.0f. 2.0f. 3.0f};

8.单项选择题Which interface does java.util.Hashable implement?()  

A. Java.util.Map.
B. Java.util.List.
C. Java.util.Hashable.
D. Java.util.Collection.

9.多项选择题Which two interfaces provide the capability to store objects using a key-value pair?()

A. Java.util.Map.
B. Java.util.Set.
C. Java.util.List.
D. Java.util.StoredSet.
E. Java.util.StoredMap.
F. Java.util.Collection.