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constructor一题?????
来源: 互联网 发布时间:2015-03-13
本文导语: 100. What is true about constructors ? (Select two) a) They initialize all the member variables b) They initialize all the instance variables c) If there is no constructor , the compiler includes default constructor. d) Compiler supplied constructor w...
100. What is true about constructors ? (Select two)
a) They initialize all the member variables
b) They initialize all the instance variables
c) If there is no constructor , the compiler includes default
constructor.
d) Compiler supplied constructor will invoke the default constructor
of the super class.
Ans CD
b为什么不对????
a) They initialize all the member variables
b) They initialize all the instance variables
c) If there is no constructor , the compiler includes default
constructor.
d) Compiler supplied constructor will invoke the default constructor
of the super class.
Ans CD
b为什么不对????
|
cd
请注意:什么是instance variables?
如果我在
class A
{
Integer i = null;
static Integer m = new Integer(2);
public A(){}
}
i 是不可能被init的.
所谓instance variable是相对与static variable将的.i(instance)/m(static)
请注意:什么是instance variables?
如果我在
class A
{
Integer i = null;
static Integer m = new Integer(2);
public A(){}
}
i 是不可能被init的.
所谓instance variable是相对与static variable将的.i(instance)/m(static)
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