[leetcode]Read N Characters Given Read4

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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 */ public int read(char[] buf, int n) { int sum = 0; char[] temp = new char[4]; int readNum = 4; while (sum < n && readNum == 4){ readNum = read4(temp); for (int i = 0; i < readNum && sum < n; i++){ buf[sum++] = temp[i]; } } return sum; } }