1.SubString返回的是這個(gè)字符串的子串例如：String s = abcdef；s.subString(a,b)； a是從第幾個(gè)下標(biāo)開始...
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1.SubString返回的是這個(gè)字符串的子串例如：String s = abcdef；s.subString(a,b)； a是從第幾個(gè)下標(biāo)開始...
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