数组未打印-Arrays.ToString（nums）

Question

我不确定如何打印数组；我尝试使用arrays.toString（nums）,但它仍然不起作用。我需要做什么才能解决这个问题？

导入java.util.Arrays；

  int arr[] = {6, 3, 8, 89, 34, 89, 132, 76, 34, 89, 11, 9, 19} ; 
  
  System.out.println(Arrays.toString(nums));

int[] temp = new int[nums.length]; //create temporary array, temp, set the length of it equal to the original array
for(int i = 0; i < nums.length; i++) {
temp[i] = nums[i]; //set every value at temp equal to every number at i
}

int index = 0; //create integer index to keep track of index
for(int i = 0; i < temp.length; i++) {
    if(temp[i] % 2 ==0) { //if number at i divided by 2 yields remainder of 0
        nums[index] = temp[i]; //set number at index equal to temp at i, because temp at i is even
        index++; //Increment of index++ means index will increase by one each loop
                 //This is done because if this is not done, only the first number will be replaced 
    }
}

 for (int i = 0; index < temp.length; index++) {
     if (temp[i] % 2 != 0) { //if number at i divided by 2 does not yield remainder of 0
         nums[index] = temp[i]; //add the temp value to nums at index
         index++; //Increment of index++ means index will increase by one each loop
         
     }
 }
 

}

Answer 1

因为你没有命名你的数组编号。你把它改成arr[]了。按以下方式声明数组：

  int nums[] = {6, 3, 8, 89, 34, 89, 132, 76, 34, 89, 11, 9, 19} ; 
  
  System.out.println(Arrays.toString(nums));