###How can I... in java###

Turn an number/integer into a String? String.valueOf(number);

Turn a String into a number/integer? Integer.parseInt(string);

Cast an int to float => No need to that explicitly, this is widening primitive conversion http://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html#jls-5.1.2 Cast a float to double => Same here.

Cast a float to int? float f = 3.14f int three = (int) f

Cast a float to int, but round it to the nearest int? float f = 3.54; int four = Math.round(f); equivalent to int four = (int) (f + 0.5f)

Get the character elements from a String? char chAtIndex2 = string.charAt(2)

Get a String as char[], e.g. so I can sort it? char[] asCharArray = string.toCharArray()

Sort an array in java? Arrays.sort(array);

Convert a String to StringBuilder? StringBuilder builder = new StringBuilder(myString);

Reverse a String in Java? new StringBuilder(string).reverse().toString();

Copy the first n elements of an array to another array? System.arraycopy(sourceArray, 0, destArray, 0, n);

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