📜  以下代码段的输出是什么?树集<String>设置 = 新树集<String>(); set.add(&quot;B&quot;); set.add(&quot;A&quot;); set.add(&quot;D&quot;); set.add(&quot;A&quot;); for(String s : set) { System.out.print(s + &quot; &quot;); } - 任何代码示例

What is the output of the following code snippet?
TreeSet set = new TreeSet();
set.add("B");
set.add("A");
set.add("D");
set.add("A");
for(String s : set) { System.out.print(s + " "); }