已知StringBuffer s=new StringBuffer("abcd"),则表达式“s.append("xyz")”的值是( ) A: "abcdxyz" B: "xyzabcd" C: "abcd+xyz" D: "xyz"
已知StringBuffer s=new StringBuffer("abcd"),则表达式“s.append("xyz")”的值是( ) A: "abcdxyz" B: "xyzabcd" C: "abcd+xyz" D: "xyz"
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