package com.zc.manythread;
import java.util.Random;
/**
 * 雙向冒泡排序
 * @author 偶my耶
 *
 */
public class BBSort  {
    //雙向冒泡算法，極大的減少了循環(huán)排序的次數(shù)
    public int[] sort(int[] a)throws Exception{
        int j;
        int limit=a.length;
        int st=-1;
        while(st<limit){
             //必須要給st和limit賦值，否則若數(shù)組一開始就有序
            st++;
            limit--;
            boolean swapped=false;
            //第一次循環(huán)將最大的值放到末尾
            for (j = st    ; j < limit; j++) {
                 if (a[j]>a[j+1]) {
                    int T=a[j];
                    a[j]=a[j+1];
                    a[j+1]=T;
                    swapped=true;
                }
            }
            if (!swapped) {
                return a;
            }else {
                swapped=false;
                //第二次循環(huán)將最小的值放到了開頭
                for (j = limit; --j>=st;) {
                    if(a[j]>a[j+1]){
                        int T=a[j];
                        a[j]=a[j+1];
                        a[j+1]=T;
                        swapped=true;
                    }
                }
                if (!swapped) {
                    return a;
                }
            }
        }
        return a;
    }
    private static int[]  createDate(int count) {
        /**
         * 無重復數(shù)組
         */
        int[] data=new int[count];
          Random rand = new Random();
          boolean[] bool = new boolean[100];
          int num = 0;
          for (int i = 0; i < count; i++) {
           do {
            // 如果產(chǎn)生的數(shù)相同繼續(xù)循環(huán)
            num = rand.nextInt(100);
           } while (bool[num]);
           bool[num] = true;
        /*   list.add(num);*///list 列表
           data[i]=num;
          }
          return data;
    }
public static void main(String[] args) {
    final int count=10;
    int[] data=createDate(count);
    for(int n : data){
           System.out.print(n+"\t");
        }
    System.out.println();
    BSrot bsrot=new BSrot(data);
    try {
    int[] a=bsrot.sort(data);
    for(int n : a){
           System.out.print(n+"\t");
        }
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}
}