问题:
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.
● 参考解析
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