单项选择题
An object is()
A.what classes are instantiated from.
B.an instance of a class.
C.a blueprint for creating concrete realization of abstractions.
D.a reference to an attribute.
E.a variable.
相关考题
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单项选择题
Amethodis()
A.an implementation of an abstraction.
B.an attribute defining the property of a particular abstraction.
C.a category of objects.
D.an operation defining the behavior for a particular abstraction.
E.a blueprint for making operations. -
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. oa[0] = null; 10. return o; 9. } 10. } 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.
D. Just after line 8(that is, as the method returns). -
多项选择题
public class MethodOver { private int x, y; private float z; public void setVar(int a, int b, float c){ x = a; y = b; z = c; } } Which two overload the setVar method?()
A. void setVar (int a, int b, float c){ x = a; y = b; z = c; }
B. public void setVar(int a, float c, int b) { setVar(a, b, c); }
C. public void setVar(int a, float c, int b) { this(a, b, c); }
D. public void setVar(int a, float b){ x = a; z = b; }
E. public void setVar(int ax, int by, float cz) { x = ax; y = by; z = cz; }
