多項(xiàng)選擇題

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.

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多項(xiàng)選擇題

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.

多項(xiàng)選擇題

Given two collection objects referenced by col1 and col2，which of these statements are true？（）

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.

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Which statements concerning the value of a member variable are true， when no explicit assignments have been made？（）

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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； }

Given two collection objects referenced by col1 and col2，which of these statements are true？（）

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Which statements concerning the value of a member variable are true， when no explicit assignments have been made？（）

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；
}

Given two collection objects referenced by col1 and col2，which of these statements are true？（）