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T158_read4_2.java

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T158_read4_2.java

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/* The read4 API is defined in the parent class Reader4.
int read4(char[] buf); */
public class Solution extends Reader4 {
private int buffPtr = 0;
private int buffCnt = 0;
private char[] buff = new char[4];
public int read(char[] buf, int n) {
int ptr = 0;
while (ptr < n) {
if (buffPtr == 0) {
buffCnt = read4(buff);
}
if (buffCnt == 0) break;
while (ptr < n && buffPtr < buffCnt) {
buf[ptr++] = buff[buffPtr++];
}
if (buffPtr >= buffCnt) buffPtr = 0;
}
return ptr;
}
}
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