如何从 map 获取键和值，并使用 Java8 方法对每个键和值执行某些操作

Question

How to get the key and value from map and perform certain operation on each key and value using Java8 methods

I got some methods but it helps only to print the message(using System.out.println),but I want to perform some operations(finding duplicates in value,comparing values using casting etc.,) in each key/value pair

Map<String,String> l_map=new TreeMap<String,String>();

Thanks in advance!

Answer 1

You have to use for...each loop for iterate HashMap

Here down is example:

Map<String, String> map = new Map<String, String>;
// FILL DATA IN HASHMAP
 
for (Map.Entry<String, String> entry : map.entrySet()) {
    System.out.println(entry.getKey() + " " + entry.getValue());
}