How to print sequence of characters according to the number next to it?

Input: a2b4c3 Output: aabbbbccc Here is my code………which has wrong output: import java.lang.*; import java.util.ArrayList; class hi { public static void main(String[] args) { String a=”…

How to determine if a String has non-alphanumeric characters?

I need a method that can tell me if a String has non alphanumeric characters. For example if the String is “abcdef?” or “abcdefà”, the method must return true.

Creating Unicode character from its number

I want to display a Unicode character in Java. If I do this, it works just fine: String symbol = “u2202”; symbol is equal to “∂”. That’s what I want. The problem is that I know the Unicode …