public static void main(String[] args) {                // String(char a[]) 方法        char a[] = {'g','o','o','d'};        String str = new String(a);        System.out.println(str);                //String(char a[],int offset,int length) 方法        char b[] = {'s','t','u','d','e','n','t'};        String s = new String(b,2,4);        System.out.println(s);    }