IdentityHashMap類的put()方法 (IdentityHashMap 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 set the given value element (val_ele) with the given key element (key_ele) when no value element associated previously with the given key otherwise it replaces the old value element with the given new value element (val_ele) for the given key element (key_ele) when any value element associated with the given key previously.

  當(dāng)以前沒有與給定鍵相關(guān)聯(lián)的值元素時(shí)，使用put()方法將給定值元素(val_ele)設(shè)置為給定鍵元素(key_ele)，否則將舊值元素替換為給定新值元素(val_ele)當(dāng)先前與給定鍵關(guān)聯(lián)的任何值元素時(shí)，給定鍵元素(key_ele)。

• 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(gè)非靜態(tài)方法，只能通過類對(duì)象訪問，如果嘗試使用類名稱訪問該方法，則會(huì)收到錯(cuò)誤消息。

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

  put()方法在替換value元素(如果存在)時(shí)不會(huì)引發(fā)異常。

Syntax:

句法：

public Value put(Key key_ele, Value val_ele);

Parameter(s):

參數(shù)：

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

  Key key_ele –表示與給定值鏈接的鍵元素。

• Value val_ele – represents the value element to be linked with the given key element (key_ele).

  值val_ele –表示要與給定鍵元素(key_ele)鏈接的value元素。

Return value:

返回值：

The return type of the method is Value, it returns the old value element linked with the given key element (key_ele) 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(key_ele)鏈接的舊value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 IdentityHashMap import java.util.*;public class PutOfIdentityHashMap {public static void main(String[] args) {// Instantiates a IdentityHashMap objectMap < Integer, String > map = new IdentityHashMap < Integer, String > ();// By using put() method is to add// key-value pairs in a IdentityHashMapmap.put(10, "C");map.put(20, "C++");map.put(50, "JAVA");map.put(40, "PHP");map.put(30, "SFDC");// Display IdentityHashMapSystem.out.println("IdentityHashMap: " + 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 IdentityHashMapSystem.out.print("IdentityHashMap: " + map);} }

Output

輸出量

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

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

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