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ByteArrayInputStream -- °ÑÄÚ´æÖеÄÒ»¸ö»º³åÇø×÷Ϊ InputStream ʹÓà .
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StringBufferInputStream -- °ÑÒ»¸ö String ¶ÔÏó×÷Ϊ InputStream .
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1.3
FileInputStream -- °ÑÒ»¸öÎļþ×÷Ϊ InputStream £¬ÊµÏÖ¶ÔÎļþµÄ¶ÁÈ¡²Ù×÷
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1.4
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