convert list to set java 8

1.Collection List Set Map differential memoryThese represent the collection in Java, where the main element is whether the elements are ordered, whether they can be repeated to distinguish between memory, in order to properly use, of course, there are synchronization differences, see the previous article related. Ordered No Allow element

[JAVA set] collections list, javalinkedlist The following content is based on the jdk1.7.0 _ 79 source code;What is shortlist? List interface implementation, and provides some queue, stack, double-end queue operations;Additional instructions on using list Compared with Array

1.Collection List Set Map differential memoryThese represent the collection in Java, where the main element is whether the elements are ordered, whether they can be repeated to distinguish between memory, in order to properly use, of course, there are synchronization differences, see the previous article related. Ordered No Allow element

Set, List, Map, and setmap in Multi-learning JavaFor a long time, the List of data that has been used in the Code is mainly List, and it is all ArrayList. This is enough. ArrayList is a packaging tool class used to implement dynamic arrays, so that code can be pulled in and pulled out during code writing, and iterative

JAVA basics-List, Set, and Map discussions, and javasetmap discussions Today, we will discuss the collection classes that we often use. Although they are commonly used, I believe there are still a lot of ape people who still abuse them. So today we will popularize them. First, take a look at the image: Start with Collection. Collection is an interface that conta

CollectionBytesList│ Invalid parameter list│ ├ Arraylist│ Vector│ Elastic StackSorted setMap├ Hashtable├ Hashmap└ Weakhashmap Collection Interface Collection is the most basic collection interface. A collection represents a group of objects, namely, elements of the collection ). Some collections allow the same elements while others do not. Some can be sorted, while others cannot. The Java SDK does not provi

List and set analysis for two Java container classes Author: Java research organization; Source: itworld Java article; Source: The container class can greatly improve the programming efficiency and programming capability. In Java2, all containers are re-designed by S

The list, set, and map interfaces are frequently used in Java to summarize the followingTheir inheritance and implementation relationships are as follows:Collection├list│├linkedlist│├arraylist│└vector│└stack└setMap├hashtable├hashmap└weakhashmapAn excerpt from an article, reproduced http://blog.csdn.net/dotnetdesigner/a

└weakhashmapCollection interfaceCollection is the most basic set interface, and a collection represents a set of object, the collection element (Elements). Some collection allow the same elements while others do not. Some can sort and others can't. The Java SDK does not provide classes that inherit directly from collection, and the

Java List,set, the conversion between arrays, mainly using the Apache Jakarta Commons collections, the specific method is as follows:Import Org.apache.commons.collections.CollectionUtils;String[] Strarray = {"AAA", "BBB", "CCC"};List strlist = new ArrayList ();Set strset = n

-xmx 1/2 size;4) Set the-xms between 1/10 and 1/4-xmx;5) Use the default settings.You need to determine the most appropriate parameter settings for your own running program based on the specific usage scenario. In addition to the two most important parameters of-XMS and-xmx, there are a number of parameters that are likely to be used, which are often strongly dependent on garbage collection algorithms, and may vary depending on the version of the JDK

-xmx 1/2 size;4) Set the-xms between 1/10 and 1/4-xmx;5) Use the default settings.You need to determine the most appropriate parameter settings for your own running program based on the specific usage scenario. In addition to the two most important parameters of-XMS and-xmx, there are a number of parameters that are likely to be used, which are often strongly dependent on garbage collection algorithms, and may vary depending on the version of the JDK

iterator () method. This method returns an iterator, and each element in the Collection can be accessed one by one using this iterator. The typical usage is as follows:[Java]Iterator it = collection. iterator (); // obtain an IteratorWhile (it. hasNext ()){Object obj = it. next (); // obtain the next element.} The two interfaces derived from the Collection interface are List and Set.List InterfaceList is a