In Java, you can use String.toCharArray() to convert a String into a char array.

package com.mkyong.utils;

public class StringToCharArray {

 public static void main(String[] args) {

 String password = "password123";

 char[] passwordInCharArray = password.toCharArray();

 for (char temp : passwordInCharArray) {
 System.out.println(temp);
 }

 }

}

Output

p
a
s
s
w
o
r
d
1
2
3

Java 8 – Convert String to Stream Char

For Java 8, you can uses .chars() to get the IntStream, and convert it to Stream Char via .mapToObj

package com.mkyong.utils;
package com.mkyong.pageview;

public class Test {

 public static void main(String[] args) {

 String password = "password123";

 password.chars() //IntStream
 .mapToObj(x -> (char) x)//Stream<Character>
 .forEach(System.out::println);

 }

}

Output

p
a
s
s
w
o
r
d
1
2
3

References

1. JavaDoc – toCharArray
2. Why is String.chars() a stream of ints in Java 8?