HashMap类entrySet()方法 (HashMap Class entrySet() method)
entrySet() method is available in java.util package. entrySet()方法在java.util包中可用。 entrySet() method is used to return an entry (key-value pairs) that exists in this HashMap to be viewed in a Set. entrySet()方法用于返回此HashMap中存在的条目(键值对)，以在Set中进行查看。 entrySet() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error. entrySet()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。 entrySet() method does not throw an exception at the time of returning entry set. 返回条目集时， entrySet()方法不会引发异常。
Syntax:
句法：
public Set entrySet();
Parameter(s):
参数：
It does not accept any parameter. 它不接受任何参数。
Return value:
返回值：
The return type of the method is Set, it returns mappings exist in this HashMap to be viewed in a Set.
方法的返回类型为Set ，它返回此HashMap中存在的映射以在Set中进行查看。
Example:
例：
// Java program to demonstrate the example
// of Set entrySet() method of HashMap
import java.util.*;
public class EntrySetOfHashMap {
public static void main(String[] args) {
// Instantiates a HashMap object
Map < Integer, String > map = new HashMap < Integer, String > ();
// By using put() method is to add
// key-value pairs in a HashMap
map.put(10, “C”);
map.put(20, “C++”);
map.put(50, “JAVA”);
map.put(40, “PHP”);
map.put(30, “SFDC”);
// Display HashMap
System.out.println(“HashMap: ” + map);
// By using entrySet() method is to
// return the entry exists in this
// HashMap to be viewed in a Set
Set s = map.entrySet();
// Display set view
System.out.print(“map.entrySet(): “);
System.out.println(s);
}
}
Output
输出量
HashMap: {50=JAVA, 20=C++, 40=PHP, 10=C, 30=SFDC}
map.entrySet(): [50=JAVA, 20=C++, 40=PHP, 10=C, 30=SFDC]
翻译自: https://www.includehelp.com/java/hashmap-entryset-method-with-example.aspx
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