String类的toCharArray()方法将此字符串转换为字符数组。
import java.lang.*;
public class StringDemo {
   public static void main(String[] args) {
      //将字符串值转换为字符数组类型值
      String str = " Java was developed by James Gosling";
      char retval[] = str.toCharArray();
      //显示转换后的值
      System.out.println("Converted value to character array = ");
      System.out.println(retval);
   }
}输出结果
Converted value to character array = Java was developed by James Gosling