本文共 1930 字,大约阅读时间需要 6 分钟。
weakhashmap
entrySet() method is available in java.util package.
entrySet()方法在java.util包中可用。
entrySet() method is used to retrieve the mappings that exist in this map to be viewed in a collection.
entrySet()方法用于检索此映射中存在的映射,以在集合中进行查看。
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 viewing elements in a collection.
在查看集合中的元素时, 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 existing mappings in this map in a collection view.
方法的返回类型为Set ,它在集合视图中返回此映射中的现有映射。
Example:
例:
// Java program to demonstrate the example // of Set entrySet() method of WeakHashMap import java.util.*;public class EntrySetOfWeakHashMap { public static void main(String[] args) { // Instantiates a WeakHashMap object Map < Integer, String > map = new WeakHashMap < Integer, String > (); // By using put() method is to add // key-value pairs in a WeakHashMap map.put(10, "C"); map.put(20, "C++"); map.put(50, "JAVA"); map.put(40, "PHP"); map.put(30, "SFDC"); //Display WeakHashMap System.out.println("WeakHashMap: " + map); // By using entrySet() method is to // return the entry exists in this // WeakHashMap 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
WeakHashMap: {30=SFDC, 40=PHP, 10=C, 20=C++, 50=JAVA}map.entrySet(): [30=SFDC, 40=PHP, 10=C, 20=C++, 50=JAVA]
翻译自:
weakhashmap
转载地址:http://nytzd.baihongyu.com/