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.

你可能感興趣的試題

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.

99色精品-9色在线-99色在线-99色视频 国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

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

你可能感興趣的試題

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； }

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

99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

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？（）