Java ArrayList toArray 方法 Java ArrayList toArray方法 Java ArrayList trimToSize方法 Java ArrayList toArray 方法 package com.codingdict; import java.util.ArrayList; public class ArrayListDemo { public static void main(String[] args) { // create an empty array list with an initial capacity ArrayList<Integer> arrlist = new ArrayList<Integer>(5); // use add() method to add values in the list arrlist.add(20); arrlist.add(40); arrlist.add(10); arrlist.add(15); arrlist.add(25); // let us print all the elements available in list for (Integer number : arrlist) { System.out.println("Number = " + number); } Object[] ob = arrlist.toArray(); System.out.println("Printing elements from first to last:"); for (Object value : ob) { System.out.println("Number = " + value); } } } Java ArrayList toArray方法 Java ArrayList trimToSize方法