选择排序

 

 

/**
 * 选择排序  时间复杂度O(n^2)
 * @author Administrator
 *
 */
public class SelectSort {
    
    public static void main(String[] args) {
    int [] arr = {1,-3,4,-2,5,67,32,-4};
    
    for (int i = 0; i < arr.length -1; i++) {
        int min = arr[i];
        int minIndex=i;
        for (int j = i+1; j < arr.length; j++) {
            if (min > arr[j]) {
                min=arr[j];
                minIndex=j;
            }
        }
        
        //将最小值放在arr[0]里面
        if (i!=minIndex) {
            arr[minIndex]=arr[i];
            arr[i]=min;
            
        }
    }
    System.out.println(Arrays.toString(arr));
    
    }

}