Java Set<String> equality ignore case

Question

I want to check if all elements of two sets of String are equal by ignoring the letter's cases.

Set<String> set1 ; Set<String> set2 ; . . . if(set1.equals(set2)){ //all elements of set1 are equal to set2   //dosomething } else{  //do something else } 

However, this equality check doesn't ignore the cases of the string. Is there some other way of doing that?

Answer 1

Alternatively you can use TreeSet.

public static void main(String[] args){     Set<String> s1 = new TreeSet<String>(String.CASE_INSENSITIVE_ORDER);     s1.addAll(Arrays.asList(new String[] {"a", "b", "c"}));      Set<String> s2 = new TreeSet<String>(String.CASE_INSENSITIVE_ORDER);     s2.addAll(Arrays.asList(new String[] {"A", "B", "C"}));      System.out.println(s1.equals(s2)); }