插入排序

package cn.aust.zyw.demo;

/**
 * Created by zyw on 2016/2/9.
 * insert-sort
 */
public class Insertion {
    public static  void sort(int [] a){
        int N=a.length;
        for(int i=1;i<N;i++){
            for(int j=i;j>0&&less(a[j],a[j-1]);j--)
                exch(a,j,j-1);

        }
    }
    private static boolean less(int  v, int w){
        if(v<w) return true;
        return false;
    }
    private static void exch(int[] a,int i,int j){
        int t=a[i];a[i]=a[j];a[j]=t;
    }
    private static void show(int[] a){
        for(int i=0;i<a.length;i++){
            System.out.printf(a[i]+" ");
        }
    }
    public static boolean isSorted(int[] a){
        for(int i=1;i<a.length;i++)
            if(less(a[i],a[i-1])) return false;
        return true;
    }
    public static  void main(String args[]){
        int a[]={20,5,14,3,63,1,55,11,0};
        sort(a);
        show(a);
    }

}