调整数组中数字的顺序，使得所有奇数位于数组的前半部分

public class Test03 {

    public static void main(String[] args) {
        int [] a = {1,2,3,4,5,6,7,8,9,10,11,12};
        int i,m;
        m = a.length-1;
        for(i = 0; i <= m;){
            if(a[i]%2 == 0){
                a[i] = a[i] + a[m];
                a[m] = a[i]- a[m];
                a[i] = a[i]-a[m];
                m--;
            }else
                i++;
        }
        for(int j : a){
            System.out.print(j+" ");
        }
    }
}