bidirbubblesortalgorithm.java

来自「几个java的程序」· Java 代码 · 共 48 行

/**
 * 双向气泡排序算法
 */
class BidirBubbleSortAlgorithm extends SortAlgorithm {
    void sort(int a[]) throws Exception {
	int j;
	int limit = a.length;
	int st = -1;
	while (st < limit) {
	    st++;
	    limit--;
	    boolean swapped = false;
	    for (j = st; j < limit; j++) {
		if (stopRequested) {
		    return;
		}
		if (a[j] > a[j + 1]) {
		    int T = a[j];
		    a[j] = a[j + 1];
		    a[j + 1] = T;
		    swapped = true;
		}
		pause(st, limit);
	    }
	    if (!swapped) {
		return;
	    }
	    else
		swapped = false;
	    for (j = limit; --j >= st;) {
		if (stopRequested) {
		    return;
		}
		if (a[j] > a[j + 1]) {
		    int T = a[j];
		    a[j] = a[j + 1];
		    a[j + 1] = T;
		    swapped = true;
		}
		pause(st, limit);
	    }
	    if (!swapped) {
		return;
	    }
	}
    }
}