将集合转换为 int 数组

Question

I want to display a graph and for displaying that i need integer values.I get this from my code

    Collection c = Sort.values();

Is there any way that i convert collection in such a way that i get integer values?i get this when i print the collection c

    [64770, 26529, 13028, 848, 752, 496]

Answer 1

Assuming the values are of type Integer , you can try this:

Collection c = Sort.values();
Integer[] a = (Integer[])(c.toArray(new Integer[c.size()]));

Answer 2

for (Integer value : c) {
    int i = value.intValue();
    //do something with either value or i
}

Answer 3

The question was: conversion to int array
Integer[] can not be assigned to int[] or vice versa

int[] array = c.stream().mapToInt( i -> i ).toArray();

Answer 4

Simply:

Integer[] yourArrayVar = yourCollectionVar.toArray(new Integer[0]);

java just needs to know what kind of array to produce.