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When doing string concatenation for many times in a loop, which is the fastest way in terms of executing time:A) The concat() method of StringB) The + operator of StringC) The append() method of

题目There are 4 variables:        short v1 = 18;        Long v2 = new Long("18");        Long v3 = new Long(18);        Short v4 = new Short(v1);Which of the following statements are true: