ArrayList_toArray

package com.day15.collection;

import java.util.ArrayList;
import java.util.Collection;

public class Array_toArray {

  public static void main(String[] args) {
    Collection c=new ArrayList();
    c.add(1);//支持自动装箱,事实上将1转换成了字符串对象
    c.add("k");
    c.add("o");
    Object[] arr=c.toArray();//将元素转成数组
    for (int i = 0; i < arr.length; i++) {
      if(i==arr.length-1) {System.out.println(arr[i]);}//o
      else {System.out.print(arr[i]+",");}//1,k,
    }
  }
}
//最后输出1,k,o

原文地址:https://www.cnblogs.com/zhujialei123/p/8998796.html

时间: 2024-10-21 12:46:49

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