多项选择题
Which statements concerning the value of a member variable are true， when no explicit assignments have been made？（）
A.The value of an int is undetermined.
B.The value of all numeric types is zero.
C.The compiler may issue an error if the variable is used before it is initialized.
D.The value of a String variable is "" （empty string）.
E.The value of all object variables is null.
相关考题
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多项选择题
Which statements concerning the relationships between the following classes are true？（） class Foo { int num； Baz comp = new Baz（）； } class Bar { boolean flag； } class Baz extends Foo { Bar thing = new Bar（）； double limit； }
A.A Bar is a Baz.
B.A Foo has a Bar.
C.A Baz is a Foo.
D.A Foo is a Baz.
E.A Baz has a Bar. -
多项选择题
Giventwocollectionobjectsreferencedbycol1andcol2，whichofthesestatementsaretrue？（）
A.The operation col1.retainAll（col2） will not modify the col1 object.
B.The operation col1.removeAll（col2） will not modify the col2 object.
C.The operation col1.addAll（col2） will return a new collection object， containing elements from both col1 and col2.
D.The operation col1.containsAll（Col2） will not modify the col1 object. -
多项选择题
Which statements concerning the following code are true？（） class a { public a（） {} public a（int i） { this（）； } } class b extends a { public boolean b（String msg） { return false； } } class c extends b { private c（） { super（）； } public c（String msg） { this（）； } public c（int i） {} }
A.The code will fail to compile.
B.The constructor in a that takes an int as an argument will never be called as a result of constructing an object of class b or c.
C.Class c has three constructors.
D.Objects of class b cannot be constructed.
E.At most one of the constructors of each class is called as a result of constructing an object of class c.
