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String s1,s2,s3 = "abc", s4 ="abc" ;
s1 = new String("abc");
s2 = new String("abc");
é£ä¹ï¼s1==s2 æ¯ false //两个åéçå
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s1.equals(s2) æ¯ true //两个åéçæå
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å¦æï¼ StringBuffer s1 = new StringBuffer("a");
StringBuffer s2 = new StringBuffer("a");
ç»æï¼ s1.equals(s2) //æ¯false
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