java - java中两个数组的并集没有得到想要的结果

Question

参数是函数的{1,2,3}和{2,3,4}。输出应该是{1,2,3,4}。我不明白我在这里做错了什么。我得到的输出是 {1,1,2,4,0,0}.. 请帮忙，谢谢

void test(int x[],int y[]){
        int i =0;
        int j= 0;
        int f =0;
        int total = x.length+ y.length;
        int a[];
        a = new int[total];
        while(i<x.length && j<y.length){
            if(x[i]<y[j]){
                a[f] = x[i];
                i++;
                f++;
            }else if(x[i]>y[j]){
                a[f] = y[j];
                j++;
                f++;
            }else{
                a[f] = x[j];
                i++;
                j++;
                f++;
            }
        }
        while(i<x.length){
            a[f] = x[i];
            i++;
            f++;
        }
        while(j<y.length){
            a[f] = y[j];
            j++;
            f++;
        }

        for(int w=0;w<a.length;w++){
            System.out.print(a[w]);
            System.out.print(" ");
        }



    }

Answer 1

引用此页面:https://www.geeksforgeeks.org/union-and-intersection-of-two-sorted-arrays-2/

// Java program to find union of 
// two sorted arrays 

class FindUnion 
{ 
    /* Function prints union of arr1[] and arr2[] 
    m is the number of elements in arr1[] 
    n is the number of elements in arr2[] */
    static int printUnion(int arr1[], int arr2[], int m, int n) 
    { 
    int i = 0, j = 0; 
    while (i < m && j < n) 
    { 
        if (arr1[i] < arr2[j]) 
        System.out.print(arr1[i++]+" "); 
        else if (arr2[j] < arr1[i]) 
        System.out.print(arr2[j++]+" "); 
        else
        { 
        System.out.print(arr2[j++]+" "); 
        i++; 
        } 
    } 

    /* Print remaining elements of 
        the larger array */
    while(i < m) 
    System.out.print(arr1[i++]+" "); 
    while(j < n) 
    System.out.print(arr2[j++]+" "); 

    return 0; 
    } 

    public static void main(String args[]) 
    { 
        int arr1[] = {1, 2, 4, 5, 6}; 
        int arr2[] = {2, 3, 5, 7}; 
        int m = arr1.length; 
        int n = arr2.length; 
        printUnion(arr1, arr2, m, n); 
    } 
}