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plz some one can explain this to me this if and the operators, why are they using and for what purpose? if (!('.equals(str.substring(0,1))) || !(.equals(str.substring(str.length()

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plz some one can explain this to me this if and the operators, why are they using and for what purpose?

if (!("'.equals(str.substring(0,1))) || !("".equals(str.substring(str.length() - 1)))) { for (int i = 0; i

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