Java Spliterator tryAdvance()用法及代码示例

tryAdvance() 是 Java Interface Spliterator 的一种方法，用于在对其执行指定操作时获取现有元素。

用法

以下是 tryAdvance() 方法的声明-

boolean tryAdvance(Consumer<? super T> action)

参数

参数	描述	必需/可选
action	它是检查元素的动作。	Required

如果在进入此方法时存在下一个元素，则 tryAdvance() 方法返回 true，否则返回 false。

异常

NullPointerException - 如果指定的操作为空，则此方法抛出异常。

兼容版本

Java 1.8 及以上

例子1

import java.util.*;
public class InterfaceSpliteratorTryAdvanceExample1 {  
     public static void main(String args[]){
    	 List<String> list = Arrays.asList("Jasmine", "Rose", "Lotus");
    	 Spliterator<String> splitr = list.spliterator();
       //Use tryAdvance() to display(action) elements of list.
    	 boolean b1 = splitr.tryAdvance(System.out::println);
    	 System.out.println("Element exists:"+b1);
    	 System.out.println(" --- bulk traversal");
    	 splitr.forEachRemaining(System.out::println);
    	 System.out.println(" --Attempting tryAdvance again--");
    	 boolean b2 = splitr.tryAdvance(System.out::println);
    	 System.out.println("Element exists:"+b2);
       }
}

输出：

Jasmine
Element exists:true
 --- bulk traversal
Rose
Lotus
 --Attempting tryAdvance again--
Element exists:false

例子2

import java.util.*;
public class InterfaceSpliteratorTryAdvanceExample2 {  
     public static void main(String args[]){
    	 List<String> nameList = Arrays.asList("Rahul", "Abhi", "Suresh", "Rani", "Nikki", "Rosy", "Prem");
    	 Spliterator<String> splitr = nameList.spliterator();
    	 while(splitr.tryAdvance((n) -> System.out.println("Name:" + n)));
       }
}

输出：

Name:Rahul
Name:Abhi
Name:Suresh
Name:Rani
Name:Nikki
Name:Rosy
Name:Prem

例子3

import java.util.*;
public class InterfaceSpliteratorTryAdvanceExample3 {  
     public static void main(String args[]){
    	 //Create an array list
         ArrayList<Integer> al1 = new ArrayList<>();             
         //Add values in the list.
         al1.add(1);
         al1.add(2);
         al1.add(3);
         al1.add(4);
         al1.add(5);                                               
         //Getting Spliterator object
         Spliterator<Integer> splitr = al1.spliterator();                      
         //Use tryAdvance() to display(action) elements of arraylist.              
         System.out.println("Elements of arraylist:");     
         while(splitr.tryAdvance((n) -> System.out.println(n)));
         }
}

输出：

Elements of arraylist:
1
2
3
4
5

相关用法

注：本文由纯净天空筛选整理自 Java Spliterator tryAdvance() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。