hashmap put方法

HashMap類的put()方法 (HashMap Class put() method)

• put() method is available in java.util package.

  put()方法在java.util包中可用。

• put() method is used to link the given value element with the given key element in this HashMap.

  put()方法用于在此HashMap中鏈接給定值元素和給定鍵元素。

• put() 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.

  put()方法是一個非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• put() method does not throw an exception at the time of replacing the old element if exists.

  put()方法在替換舊元素(如果存在)時不會引發異常。

Syntax:

句法：

public Value put(Key key_ele, Value val_ele);

Parameter(s):

參數：

• Key key_ele – represents the key element with which the given value element is to be linked.

  Key key_ele –表示與給定值元素鏈接的鍵元素。

• Value val_ele – represents the value element with which the given key element is to be linked.

  值val_ele –表示將與給定鍵元素鏈接的value元素。

Return value:

返回值：

The return type of the method is Value, it returns the old element linked with the given key element when exists otherwise it returns null.

該方法的返回類型為Value ，如果存在則返回與給定鍵元素鏈接的舊元素，否則返回null。

Example:

例：

// Java program to demonstrate the example // of Value put(Key key_ele, Value val_ele) // method of HashMap import java.util.*;public class PutOfHashMap {public static void main(String[] args) {// Instantiates a HashMap objectMap < Integer, String > map = new HashMap < Integer, String > ();// By using put() method is to add// key-value pairs in a HashMapmap.put(10, "C");map.put(20, "C++");map.put(50, "JAVA");map.put(40, "PHP");map.put(30, "SFDC");// Display HashMapSystem.out.println("HashMap: " + map);// By using put() method is to// replace the existing value associated// for the given key element with the// new value elementmap.put(50, "Microservices");// Display Modified HashMapSystem.out.print("HashMap: " + map);} }

Output

輸出量

HashMap: {50=JAVA, 20=C++, 40=PHP, 10=C, 30=SFDC} HashMap: {50=Microservices, 20=C++, 40=PHP, 10=C, 30=SFDC}

翻譯自: https://www.includehelp.com/java/hashmap-put-method-with-example.aspx

hashmap put方法

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