How many elements will be there in TreeSet after the last line and Why ?<br/><br/>TreeSet set = new TreeSet();<br/>set .add(new String("abc"));<br/>set .add(new String("abc"));

Interview Questions and Answers

Q1. How many elements will be there in TreeSet after the last line and Why ?

TreeSet set = new TreeSet();
set .add(new String("abc"));
set .add(new String("abc"));

Core Java

Ans. One.

As we haven't specified the type of TreeSet, it being evaluated with the first element insertion. Once it's identified that it's of type String and as no comparator has been defined, the comparison is done using the String compareTo method. String compareTo method compares the elements by the content / value.

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