Summarize the points to note about array union

The following example demonstrates how to use the union () method to determine whether arrays are equal: /* author by w3cschool.cc File name: Main.java */ import java.util.Arrays; import java.util.HashSet; import java.util.Set; public class Main { Public static void main(String[] args) throws Exception { &n

1. Java Example - Array Union

# #Introduction: The following example demonstrates how to use the union () method to determine whether arrays are equal:

2. Summary of php multiple array union, intersection and difference operation functions

Introduction: There are really many array functions in PHP. In actual work, knowing more about some functions of PHP itself will greatly improve the speed of work. How to process the union, intersection and difference functions of two or more arrays in PHP. (1) PHP calculates the union of two or more arrays. The union is the result set of combining two or more arrays into one array. In php, array_merge and + are generally used to merge arrays. (2) PHP calculates the intersection of two or more arrays. The intersection is the part of data that exists in two or more arrays

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