比较在Java 2列出 [英] compare 2 lists in java

问题描述

我是从两个不同的数据库获取数据，并将其存储在java.util.List中

I am getting data from the two different databases and storing them in the java.util.List

Elements of database:1 
column 1                   column 2
**Investment Number**     Investment Name
123                         abcwe
124                         agsdf
454                         lkjcv
784                         ojncv
478                         hfdgh
852                         qweyu
745                         mmkty
201                         pbckl
560                         jklfg
741                         nbvbn 

将它们存储在list1的

storing them in list1

数据库的要素：2

column 1                   column 2
Investment Number     Property Number
123                         548
980                         743
454                         200
350                         357
478                         698
852                         223
745                         795
784                         213
341                         022
741                         900

将它们存储在list2中

storing them in list2

根据需要投资数进行比较，如果在列表2可用list1的投资数目则需要保持并丢弃等。

need to compare according to the Investment Numbers if Investment Number of list1 available in list2 then need to keep and discard others.

谢谢，

推荐答案

如果您有两个列表，你可以做到以下几点：

If you have two list, you can do the following:

List<Integer> list1 = new ArrayList<>(Arrays.asList(1, 5, 6, 7));
List<Integer> list2 = new ArrayList<>(Arrays.asList(5, 6, 7, 8, 9));
list1.retainAll(list2);
System.out.println("list1 = " + list1);

和其结果将是：

list1 = [5, 6, 7]

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