Paul makes an offer to Lynn in a letter, saying nothing about how her acceptance should be sent. Lynn indicates her acceptance in a return letter. Lynn's acceptance is effectivec
【简答题】下列选项中,可以正确创建一个字符串的是( )A. String s1 = "itcast"; B. String s2 = new String("itcast"); C. String s3 = new String(new char[]{'i','t','c','s','t'}); D. int[] arr= {1,2,23,4,5};