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Giventwocollectionobjectsreferencedbycol1andcol2,whichofthesestatementsaretrue?()
A.Theoperationcol1.retainAll（col2）willnotmodifythecol1object.
B.Theoperationcol1.removeAll（col2）willnotmodifythecol2object.
C.Theoperationcol1.addAll（col2）willreturnanewcollectionobject，containingelementsfrombothcol1 andcol2.
D.Theoperationcol1.containsAll（Col2）willnotmodifythecol1object.
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更多 “ Giventwocollectionobjectsreferencedbycol1andcol2,whichofthesestatementsaretrue?() A.Theoperationcol1.retainAll（col2）willnotmodifythecol1object.B.Theoperationcol1.removeAll（col2）willnotmodifythecol2object.C.Theoperationcol1.addAll（col2）willreturnanewcollectionobject，containingelementsfrombothcol1 andcol2.D.Theoperationcol1.containsAll（Col2）willnotmodifythecol1object. ” 相关考题
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