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org.apache.commons.collections4.bag.HashBag Example
What is org.apache.commons.collections4.bag.HashBag class? How to use org.apache.commons.collections4.bag.HashBag class?
✍: FYIcenter.com
org.apache.commons.collections4.bag.HashBag class is a Java class
offered in commons-collections4.jar that
implements the org.apache.commons.collections4.Bag interface
using a HashMap to provide the data storage.
A bag is a special collection which allows the same object to be added multiple times. You can also query the number of copies of a given object in the bag. and reduce the number of copies of a given object in the bag.
Here is a simple example of using org.apache.commons.collections4.bag.HashBag class:
// Copyright (c) 2016-2018 FYIcenter.com // Supports commons-collections4-4.2 // Supports commons-collections4-4.1 import org.apache.commons.collections4.Bag; import org.apache.commons.collections4.bag.HashBag; // Example of using the HashBagExample class public class HashBagExample { public static void main(String[] args) throws Exception { // Create some objects String apple = "Apple"; String orange = "Orange"; String banana = "Banana"; // Create a HashBag bag Bag<String> bag = new HashBag<String>(); // Put some objects into the HashBag bag bag.add(apple); bag.add(apple); bag.add(apple); bag.add(orange); bag.add(orange); bag.add(banana); // Count apples, oranges and bananas System.out.println("# of apple: "+bag.getCount(apple)); System.out.println("# of orange: "+bag.getCount(orange)); System.out.println("# of banana: "+bag.getCount(banana)); // loop through the bag for (String obj : bag) { System.out.println("Element: " + obj); } } }
You can compile and run the above example in a command window as shown below:
C:\fyicenter>\fyicenter\jdk-1.8.0\bin\javac -cp C:\fyicenter\commons-collections4-4.2\commons-collections4-4.2.jar HashBagExample.java C:\fyicenter>\fyicenter\jdk-1.8.0\bin\java -cp .;C:\fyicenter\commons-collections4-4.2\commons-collections4-4.2.jar HashBagExample # of apple: 3 # of orange: 2 # of banana: 1 Element: Apple Element: Apple Element: Apple Element: Banana Element: Orange Element: Orange
⇒ org.apache.commons.collections4.set.ListOrderedSet Example
⇐ org.apache.commons.collections4.queue.CircularFifoQueue Example
2017-05-20, 1975👍, 0💬
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