Jdk1.4 和jdk1.5中的StringBuffer的不同

       return new String( value , 0, count );

}

跟踪进入 String

public String( char value[], int offset, int count) {

        if (offset < 0) {

            throw new StringIndexOutOfBoundsException(offset);

        }

        if (count < 0) {

            throw new StringIndexOutOfBoundsException(count);

        }