Collections: unmodifiableMap(Map m) : Collections « java.util « Java by API

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Java by API » java.util » Collections

Collections: unmodifiableMap(Map m)


  



import java.util.Collections;

import java.util.Hashtable;

import java.util.Map;



public class Main {

  public static void main(String[] s) {

    Hashtable<String,String> table = new Hashtable<String,String>();

    table.put("key1", "value1");

    table.put("key2", "value2");

    table.put("key3", "value3");



    Map m = Collections.unmodifiableMap(table);



    m.put("key3", "value3");



    System.out.println(m);



  }

}

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35.	Collections: unmodifiableSet(Set s)

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