java好难

import java.util.ArrayList;
public class OddEvenNum {
    private int[] num = {12,45,32,78,54,9,37,89,43,67,10,50};
    private int[] oddNum; //奇数
    private int[] evenNum;
    
    public void separate(){
        ArrayList<Integer> odd = new ArrayList<Integer>();
        ArrayList<Integer> even = new ArrayList<Integer>();
        
        for(int i=0; i<num.length; i++){
            if((num[i]&1)==0){
                even.add(num[i]);
            }
            else odd.add(num[i]);
        }
        
        //转换成数组
        oddNum = new int[odd.size()];
        evenNum = new int[even.size()];
        for(int i=0; i<odd.size(); i++)
            oddNum[i]=odd.get(i);
        for(int i=0; i<even.size(); i++)
            evenNum[i]=even.get(i);
    }
    
    public void print(){
        System.out.println("奇数序列：");
        for(Object i:oddNum)
            System.out.print(i + " ");
        System.out.println("\n偶数序列：");
        for(Object i:evenNum)
            System.out.print(i + " ");
    }
    
    public static void main(String[] args) {
        OddEvenNum test = new OddEvenNum();
        test.separate();
        test.print();
    }
}