get first character of string java

1firstFourChars = input.substring(0, 4);

1var string = "freeCodecamp";
2
3string.charAt(0); // Returns "f"

1String words = "Hi There"; //creating a string var named 'words'
2char index = words.charAt(0); /* setting a variable 'index' to letter
3'0' of variable 'words'. In this case, index = 'H'.*/
4System.out.println(index); //print var 'index' which will print "H"

1String str = "Grepper";
2char ch = str.charAt(0);
3//ch is assigned the value of G

1char fourth = "Banana".charAt(3);