查找ArrayList和显示重复的元素

问题描述

有人能帮助我吗？我需要编写一个程序，在那里我在的ArrayList 10个元素，我需要找到它有多少重复的值，并计算和WEL显示的值。

例如：说我有

 列表= {堆栈，溢出，堆栈，
        雅虎，谷歌，MSN，
        MSN，堆栈，溢出，用户}
 

结果应该是：

 堆栈= 3
溢出= 2
谷歌= 1
MSN = 2
雅虎= 1
用户= 1
 

解决方案

使用库的多集。它支持添加元素的整数倍，且多集包含每个元素的多少次计数。

 多重集＆LT;串GT; wordsMultiset = HashMultiset.create（）;
wordsMultiset.addAll（字）;
对于（Multiset.Entry＆LT;串GT;项：wordsMultiset.entrySet（））{
     的System.out.println（词：+ entry.getElement（）+伯爵 - ＆gt;中+ entry.getCount（））;
}
 

Can anybody help me? I need to write a program, where I have 10 elements in the arraylist and I need to find the how many duplicate values it has and count and display the values as wel.

Ex: say I have

list = {"stack", "overflow", "stack",
        "yahoo", "google", "msn",
        "MSN", "stack", "overflow", "user" }

Result should be:

stack = 3
overflow = 2
google = 1
msn = 2
yahoo =1
user = 1

解决方案

Use Google Guava library's MultiSet. It supports adding multiples of elements, and counting how many occurrences of each element the multiset contains.

Multiset<String> wordsMultiset = HashMultiset.create();
wordsMultiset.addAll(words);
for(Multiset.Entry<String> entry : wordsMultiset.entrySet() ){
     System.out.println("Word : "+entry.getElement()+" count -> "+entry.getCount());
}

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