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Code01_BitMap1.java
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61 lines (50 loc) · 1.25 KB
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package class05;
import java.util.HashSet;
// 这个类的实现是错误的
// 请问为什么？
public class Code01_BitMap1 {
public static class BitMap {
private long[] bits;
public BitMap(int max) {
bits = new long[(max + 64) >> 6];
}
public void add(int num) {
bits[num >> 6] |= (1 << (num & 63));
}
public void delete(int num) {
bits[num >> 6] &= ~(1 << (num & 63));
}
public boolean contains(int num) {
return (bits[num >> 6] & (1 << (num & 63))) != 0;
}
}
public static void main(String[] args) {
System.out.println("测试开始！");
int max = 10000;
BitMap bitMap = new BitMap(max);
HashSet<Integer> set = new HashSet<>();
int testTime = 10000000;
for (int i = 0; i < testTime; i++) {
int num = (int) (Math.random() * (max + 1));
double decide = Math.random();
if (decide < 0.333) {
bitMap.add(num);
set.add(num);
} else if (decide < 0.666) {
bitMap.delete(num);
set.remove(num);
} else {
if (bitMap.contains(num) != set.contains(num)) {
System.out.println("Oops!");
break;
}
}
}
for (int num = 0; num <= max; num++) {
if (bitMap.contains(num) != set.contains(num)) {
System.out.println("Oops!");
}
}
System.out.println("测试结束！");
}
}