Below program illustrates how to check if given Strings are anagram or not in Java:

public class AnagramStrings {
 
	public static void main(String[] args) {
		String s1 = "Army";
		String s2 = "Mary";
		System.out.println("Strings are anagram? " + checkAnagrams(s1, s2));
		System.out.println("Strings are anagram? " + checkAnagrams2(s1, s2));
 
	}
	
	private static boolean checkAnagrams(String s1, String s2) {
		if(s1.length() != s2.length()) {
			return false;
		}
		
		s1 = s1.toLowerCase();
		s2 = s2.toLowerCase();
		
		char[] s1Arr = s1.toCharArray();
		char[] s2Arr = s2.toCharArray();
		
		Arrays.sort(s1Arr);
		Arrays.sort(s2Arr);
		
		return Arrays.equals(s1Arr, s2Arr);
	}
	
	private static boolean checkAnagrams2(String s1, String s2) {
		if(s1.length() != s2.length()) {
			return false;
		}
		
		s1 = s1.toLowerCase();
		s2 = s2.toLowerCase();
		
		char[] s1Arr = s1.toCharArray();
		
		for(char ch : s1Arr) {
			int index = s2.indexOf(ch);
			if(index == -1) {
				return false;
			} else {
				s2 = s2.substring(0, index) + s2.substring(index+1, s2.length());
			}
		}
		return s2.isEmpty();
	}
}