基于另一个数组的Java打印数组

Question

I am trying to print an Array, however, I am needing to print the right array, off of an integer from another array.

(ie) arrayInt contains 2,4,6,5,1 . I want to use a for loop to print the numbers. Then, I want to print the double that is corresponding to the int . arrayInt , that has been sorted, is 1,2,3,4,5 and arrayDouble, that hasn't been sorted, is 2.6,6.9,1.3,2.4,9.8 . After I print arrayInt[0] , which is 1 , I want to print the corresponding (in this case the 1 ^st ) value in arrayDouble .

The following code is what I came up with:

for (int k = 0; k < 7; k++)
    System.out.printf("%d %.2f\n", sortedNum[k], arrayWeight[(sortedNum[k])]);

Answer 1

I think you kinda answered your own question here, have you tried the code that you specified?

If I understood correctly you want to print something from an array based on the index that is stored in another array, if so, the following code should work (notice I removed the parenthesees from your code):

for (int k = 0; k < 7; k++) {
    System.out.printf("%d %.2f\n", sortedNum[k], arrayWeight[sortedNum[k]]);
}

This is assuming sortedNum is an array of ints and arrayWeight is an array of floats.

Answer 2

You have to check size of second array before trying to fetch value from it

for (int k = 0; k < 7; k++) { 
if (sortedNum[k] < arrayWeight.length)
System.out.printf("%d %.2f\n", sortedNum[k], arrayWeight[sortedNum[k]]); 
}