How to Efficiently Parse an Integer from a Character in Java?

Parsing Integer Values from Characters in Java

Question:

How can you efficiently parse an integer value from a character within a string? Consider that the character at a specific index is known to be a digit.

Initial Approach:

One common approach is to create a String from the character and then convert it to an integer using Integer.parseInt(), as demonstrated in the example:

String element = "el5";
String s = ""+element.charAt(2);
int x = Integer.parseInt(s);

Improved Solution:

However, there's a more concise and efficient method using Character.getNumericValue(char). This method accepts a character and returns its numeric value, if the character represents a digit:

String element = "el5";
int x = Character.getNumericValue(element.charAt(2));

This approach eliminates the need to create an intermediate String and results in the same outcome:

x=5

Unicode Support:

One significant advantage of Character.getNumericValue() is its support for Unicode characters representing digits. For instance, it correctly handles characters like "el٥" and "el५," representing the digit 5 in Eastern Arabic and Hindi/Sanskrit, respectively:

String element = "el٥";
int x = Character.getNumericValue(element.charAt(2));
System.out.println("x=" + x);

This example will produce:

x=5

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