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【单选题】
对于下述定义的变量，以下表达式的值为true的是________。String str1=new String("java");String str2=new String("java");StringBuffer str3=new StringBuffer("java");A.
str1==str2;
B.
str1.equals(str2);
C.
str1==str3;
D.
以上都不对
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