java中如何在一组数中取3个绝对值不等的数？

java中如何在一组数中取3个绝对值不等的数？

粗糙写了下

import java.util.Calendar;
import java.util.Random;

public class AbsInt {
private static int[] getAbs(int[] a) {
Random rnd = new Random(Calendar.getInstance().getTimeInMillis());
int[] num = new int[3];
int k = 0 ;
int f , n;
while( k < 3){
n = 0;
f = rnd.nextInt(a.length);
for (int i=0; i<k; i++){
if (Math.abs(a[f]) != Math.abs(num[i]))
n++;
}
if (n != k){
continue;
}else
num[k++] = a[f];
}
return num;
}

public static void main(String[] args){
int[] abs = {1,2,3,4,-1,-2,-3,-4};
int[] num;
num = getAbs(abs);
for (int i=0; i<3; i++)
p(num[i]);
}

private static void p(Object obj) {
System.out.println(obj);
}
}2010-05-03

循环+比较....2010-05-03