题目内容
(请给出正确答案)
[主观题]
StringBuffer sb = new StringBuffer("Hello,");String t = " WELCOME!"
StringBuffer sb = new StringBuffer("Hello,");String t = " WELCOME!"
StringBuffer sb = new StringBuffer("Hello,");
String t = " WELCOME!";
t = t + "my friend!";
sb.append(t);
System.out.println(sb.toString().toLowerCase());
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