如何将字符串转换为char以填充Java中的数组?

As the title states I am looking to create a char array and the user input should be stored as char. I am doing this to create buggy code which can fall prey to a buffer overflow. After I have this working I will truncate the input and not cause a buffer overflow. But I am having trouble figuring out how to store my strings as char in Java when I am directed to do such. Here's the code I have so far: As the title states I am looking to create a ch