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entrySet() method is available in java.util package.
entrySet()方法在java.util包中可用。
entrySet() method is used to returns the set of the entry (key-value pair) that exists in this LinkedHashMap to be viewed in a Set.
entrySet()方法用于返回此LinkedHashMap中存在的条目(键值对)的集合,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.
entrySet()方法在返回条目时不会引发异常。
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 Set view of all the entry exists in this LinkedHashMap.
该方法的返回类型为Set ,它返回此LinkedHashMap中存在的所有条目的Set视图。
Example:
例:
// Java program to demonstrate the example // of Set entrySet() method of LinkedHashMap import java.util.*;public class EntrySetOfLinkedHashMap { public static void main(String[] args) { // Instantiates a LinkedHashMap object Map < Integer, String > map = new LinkedHashMap < Integer, String > (); // By using put() method is to add // key-value pairs in a LinkedHashMap map.put(10, "C"); map.put(20, "C++"); map.put(50, "JAVA"); map.put(40, "PHP"); map.put(30, "SFDC"); // Display LinkedHashMap System.out.println("LinkedHashMap: " + map); // By using entrySet() method is to // return the entry exists in this // LinkedHashMap 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
LinkedHashMap: {10=C, 20=C++, 50=JAVA, 40=PHP, 30=SFDC}map.entrySet(): [10=C, 20=C++, 50=JAVA, 40=PHP, 30=SFDC]
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