单项选择题
You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order. Which interface provides that capability?()
A.Java.util.Map.
B.Java.util.Set.
C.Java.util.List.
D.Java.util.StoredSet.
E.Java.util.StoredMap.
F.Java.util.Collection.
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相关考题
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填空题
3. string foo = “ABCDE”; 4. foo.substring(3); 5. foo.concat(“XYZ”); 6. Type the value of foo at line 6.() -
单项选择题
1. public class X ( 2. public object m () { 3. object o = new float (3.14F); 4. object [] oa = new object [1]; 5. oa[0]= o; 6. o = null; 7. return oa[0]; 8. } 9. } When is the float object created in line 3, eligible for garbage collection?()
A. Just after line 5
B. Just after line 6
C. Just after line 7 (that is, as the method returns)
D. Never in this method. -
单项选择题
1. public class returnIt ( 2. returnType methodA(byte x, double y) ( 3. return (short) x/y * 2; 4. ) 5. ) What is the valid returnType for methodA in line 2?()
A. Int
B. Byte
C. Long
D. Short
E. Float
F. Double
