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82 lines (72 loc) · 2.41 KB
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package jiuzhang.java.elementary;
import java.util.ArrayList;
//ArrayList
//*Note: 常用API
public class ArrayListManager {
/**
* @param n: You should generate an array list of n elements.
* @return: The array list your just created.
*/
public static ArrayList<Integer> create(int n) {
// Write your code here
ArrayList<Integer> arrayList= new ArrayList<Integer>(n); //*Note: capacity is not size
// for (int i = 0; i < n; i++) {
// arrayList.add(i);
// }
return arrayList;
}
/**
* @param list: The list you need to clone
* @return: A deep copyed array list from the given list
*/
public static ArrayList<Integer> clone(ArrayList<Integer> list) {
// Write your code here
ArrayList<Integer> arrayList= new ArrayList<Integer>(list.size());
for (Integer i: list) {
arrayList.add(i);
}
return arrayList;
}
/**
* @param list: The array list to find the kth element
* @param k: Find the kth element
* @return: The kth element
*/
public static int get(ArrayList<Integer> list, int k) {
// Write your code here
return list.get(k);
}
/**
* @param list: The array list
* @param k: Find the kth element, set it to val
* @param val: Find the kth element, set it to val
*/
public static void set(ArrayList<Integer> list, int k, int val) {
// write your code here
list.set(k, val);
}
/**
* @param list: The array list to remove the kth element
* @param k: Remove the kth element
*/
public static void remove(ArrayList<Integer> list, int k) {
// write tour code here
list.remove(k);
}
/**
* @param list: The array list.
* @param val: Get the index of the first element that equals to val
* @return: Return the index of that element
*/
public static int indexOf(ArrayList<Integer> list, int val) {
if (list == null) {
return -1; //*Note: always think about corner case, look at the parameters
}
return list.indexOf(val); //*Note: return -1 if val is not found
}
public static void main(String[] args) {
//ArrayListManager am = new ArrayListManager();
ArrayList<Integer> a = ArrayListManager.create(5);
System.out.println(a.size());
}
}