Java AbstractCollection类的toArray()方法
在toArray()该班类AbstractCollection方法用来返回这个集合中的元素。元素以数组形式返回。
语法如下
public Object[] toArray()
要使用Java中的AbstractCollection类，请导入以下包
import java.util.AbstractCollection;
首先，声明AbstractCollection并添加一些元素
AbstractCollection<Object> absCollection = new ArrayList<Object>();
absCollection.add("Laptop");
absCollection.add("Tablet");
absCollection.add("Mobile");
absCollection.add("E-Book Reader");现在，使用该toArray()方法以数组形式返回元素
Object[] myArr = absCollection.toArray();
以下是toArray()在Java中实现AbstractCollection方法的示例
示例
import java.util.ArrayList;
import java.util.AbstractCollection;
public class Demo {
public static void main(String[] args) {
AbstractCollection<Object> absCollection = new ArrayList<Object>();
absCollection.add("Laptop");
absCollection.add("Tablet");
absCollection.add("Mobile");
absCollection.add("E-Book Reader");
absCollection.add("SSD");
absCollection.add("HDD");
System.out.println("AbstractCollection = " + absCollection);
System.out.println("Count of Elements in the AbstractCollection = " + absCollection.size());
Object[] myArr = absCollection.toArray();
System.out.println("Array returning the elements of this collection = ");
for (int i = 0; i < myArr.length; i++)
System.out.println(myArr[i]);
}
}输出结果
AbstractCollection = [Laptop, Tablet, Mobile, E-Book Reader, SSD, HDD] Count of Elements in the AbstractCollection = 6 Array returning the elements of this collection = Laptop Tablet Mobile E-Book Reader SSD HDD