Medium - Java Formatter

StringFormat.java

System.out.printf("%s", object);
String.format("%S -> %1$s", object.getValue());
String.format("%i", object.getInteger());
String.format("%2.2f", object.getFloat());

ToUpperCase

String string = "this should start with a capital letter";
// first way
string = string.substring(0, 1).toUppercase() + string.substring(1);

// second way
char[] chars = string.toCharArray();
chars[0] = Character.toUpperCase(chars[0]);
string = new String chars;