Issue on converting a string into individual chars

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Java

Please give me a solution for my question.

in java i am trying to convert a string into a individual chars.For example i have a string="ramesh";
Now i want to store this string into a string array.For example i take a string array like string[] str;
str[0]="r";
str[1]="a";
str[2]="m";
str[3]="e";
str[4]="s";
str[5]="h";
How to do this in java within servlet.