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  String s1 = "abcd";
  String s2 = "ab";
  String s3 = s2+"cd";
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false
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s3 = s2 + "cd" s3ÔÚ¶ÑÖÐ
String s4 = "ab" + "cd" ;
System.out.println(s1==s4);

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ÕâÑùÎʰÉ,Èç¹û¿ÉÒÔ·ÃÎÊ.
ÄÇô:
  String s1 = "abcd";
  String s2 = "ab";
  String s3 = s2+"cd";
  System.out.println(s1==s3);
½á¹û:
false
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s3 = s2 + "cd" s3ÔÚ¶ÑÖÐ
String s4 = "ab" + "cd" ;
System.out.println(s1==s4)


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