Java LinkedHashMap forEach（）方法与示例

LinkedHashMap类的forEach()方法 (LinkedHashMap Class forEach() method)

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

  java.util包中提供了forEach()方法 。

• forEach() method is used to perform the specified action for every entry (key-value) pairs in the LinkedHashMap till all the entries have been executed.

  forEach()方法用于对LinkedHashMap中的每个条目(键值)对执行指定的操作，直到执行完所有条目为止。

• forEach() 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.

  forEach()方法是一种非静态方法，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。

• forEach() method does not throw an exception at the time of acting.

  forEach()方法在执行操作时不会引发异常。

Syntax:

句法：

    public void forEach(BiConsumer actions);

Parameter(s):

参数：

• BiConsumer actions – represents the action to be performed.

  BiConsumer操作 –表示要执行的操作。

Return value:

返回值：

The return type of the method is void, it returns nothing.

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example 
// of void forEach(BiConsumer actions)  method 
// of LinkedHashMap 

import java.util.*;

public class ForEachOfLinkedHashMap {
     
    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 forEach() method is to
        // iterate the objects exists
        // in this LinkedHashMap
        map.entrySet().stream().forEach((bi) -> {
     
            System.out.println(bi.getKey() + " " + bi.getValue());
        });
    }
}

Output

输出量

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

翻译自: https://www.includehelp.com/java/linkedhashmap-foreach-method-with-example.aspx