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| 9. 3. 18. 循环缓冲区 |
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public class TestCircularBuffer {
public static void main(String args[]) {
TestCircularBuffer t = new TestCircularBuffer();
}
public TestCircularBuffer() {
CircularBuffer c = new CircularBuffer(8);
System.out.println("Storing: 1");
c.store(1);
System.out.println("Reading: " + c.read());
System.out.println("Storing: 2");
c.store(2);
System.out.println("Storing: 3");
c.store(3);
System.out.println("Storing: 4");
c.store(4);
System.out.println("Reading: " + c.read());
System.out.println("Reading: " + c.read());
System.out.println("Storing: 8");
c.store(8);
System.out.println("Storing: 9");
c.store(9);
System.out.println("Storing: 10");
c.store(10);
System.out.println("Storing: 11");
c.store(11);
System.out.println("Storing: 12");
c.store(12);
System.out.println("Reading: " + c.read());
System.out.println("Reading: " + c.read());
System.out.println("Reading: " + c.read());
System.out.println("Reading: " + c.read());
System.out.println("Reading: " + c.read());
System.out.println("Reading: " + c.read());
System.out.println("Reading: " + c.read());
System.out.println("Reading: " + c.read());
}
}
class CircularBuffer {
private Integer data[];
private int head;
private int tail;
public CircularBuffer(Integer number) {
data = new Integer[number];
head = 0;
tail = 0;
}
public boolean store(Integer value) {
if (!bufferFull()) {
data[tail++] = value;
if (tail == data.length) {
tail = 0;
}
return true;
} else {
return false;
}
}
public Integer read() {
if (head != tail) {
int value = data[head++];
if (head == data.length) {
head = 0;
}
return value;
} else {
return null;
}
}
private boolean bufferFull() {
if (tail + 1 == head) {
return true;
}
if (tail == (data.length - 1) && head == 0) {
return true;
}
return false;
}
}
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