java program to convert char array to String

package com.usr.strings;

public class ConvertCharArrayToString {

       public static void main(String[] args) {

              char[] charArr = { 'w', 'e', 'l', 'c', 'o', 'm', 'e', ' ', 't', 'o',

                           ' ', 'j', 'a', 'v', 'a', '1', '1', 's' };

              String str = new String(charArr);

              System.out.println("converted String is:" + str);

              String str1 = String.valueOf(charArr);

              System.out.println("covnverted String is:" + str1);

       }

}

OUTPUT
converted String is:welcome to java11s
covnverted String is:welcome to java11s

java program to convert String to char array

package com.usr.strings;

public class ConvertStringToCharArray {

       public static void main(String[] args) {

              String str="welcome to java11s.blogspot.in";

              char[] charArr=str.toCharArray();

              for(char temp:charArr){

                     System.out.println(temp);

              }

       }

}

OUTPUT

w

e

l

c

o

m

e

t

o

j

a

v

a

1

1

s

.

b

l

o

g

s

p

o

t

.

i

n

java program to separate alphabets and numbers from string

package com.usr.strings;

public class SeparateAlphabetsAndDigitsFromString {

       public static void main(String[] args) {

              String input = "1a2b3c4defgh567jkl";

              separateDigitsAndAlphabets(input);

       }

       public static void separateDigitsAndAlphabets(String str) {

              String number = "";

              String letter = "";

              for (int i = 0; i < str.length(); i++) {

                     char a = str.charAt(i);

                     if (Character.isDigit(a)) {

                           number = number + a;

                     } else {

                           letter = letter + a;

                     }

              }

              System.out.println("Alphates in string:"+letter);

              System.out.println("Numbers in String:"+number);

       }

}

output 

Alphates in string:abcdefghjkl
Numbers in String:1234567