Java

To convert a date to a “dd/MM/yyyy” format in Java, use the “SimpleDateFormat()” constructor or the “ofPattern()” method of the “DateTimeFormatter” class.

To capitalize the first letter of a string in Java, use the “substring().toUpperCase()”, “Matcher.replaceFirst()”, or “StringUtils.capitalize()” method

To get the current year in Java, you can use different built-in classes as well as third-party libraries, such as Calendar, Year, CalendarUtils, Joda Time, etc.

To calculate percentage in Java, you can use the standard percentage formula (i.e., percentage = (parts/whole) * 100) or BigDecimal class.

To find the square root of a number in Java, use the methods like “sqrt()”, “pow()”, “binary search algorithm”, or “brute force”.

To initialize an array in Java, use the default value, “new” keyword, or call the built-in methods such as IntStream.range(), clone(), setAll(), etc.

The length() method of the Java String and StringUtils class or the length property for Arrays are used to get the string length as shown in this article.

To calculate the area of a triangle, use (base * height) / 2, implement Heron’s formula, or use the Math class methods, etc, as shown in this article.