Java - สอบถามรูปแบบการเขียน Interface Class หน่อยคับ ขอบคุณคับ

public class MyWord {
	final static String[] MY_WORD = { "It's could only be Heineken","Hello,I have to go to somewhere","Someday, I will find my way","Life is not beautiful" };
public static void main(String args[]){
	int count,pos;
	String[] str = MyWord.MY_WORD;
	for(int i=0;i<str.length;i++) {
		count = 0;
		System.out.println("Find 'e' in this sentence "+str[i]);
		System.out.print("Found 'e' at index :");
		for(int j=0;j<str[i].length();j++) {
			if (str[i].charAt(j)=='e') {
				count++;
				System.out.print(" "+j);
				}
			}
System.out.println("\nTotal 'e' : "+count);
System.out.println("**********************************");
		}
	}
}