[leetcode]Read N Characters Given Read4 II - Call multiple times

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/* The read4 API is defined in the parent class Reader4. int read4(char[] buf); */ public class Solution extends Reader4 { /** * @param buf Destination buffer * @param n Maximum number of characters to read * @return The number of characters read */ List<Character> last = new LinkedList<Character>(); public int read(char[] buf, int n) { int total = 0; int fromFour = 4; char temp[] = new char[4]; while (total < n && fromFour == 4){ fromFour = read4(temp); for (int i = 0; i < fromFour; i++){ last.add(temp[i]); } total+= fromFour; } int size = last.size(); for (int i = 0; i < n && i < size; i++, count++){ buf[i] = last.remove(0); } return Math.min(n, size); } }