Java Collections checkedSortedMap() Method

The checkedSortedMap() is an inbuilt method of Java Collections class. This method is used to get a dynamically typesafe view of the specified sorted map.

Syntax

Following is the declaration of checkedSortedMap() method:

public static <K,V> SortedMap<K,V> checkedSortedMap(SortedMap<K,V> m, Class<K> keyType, Class<V> valueType)

Parameter

Parameter	Description	Required/Optional
m	It is the map for which a dynamically typesafe view is to be returned.	Required
keyType	It is the type of key that map m is permitted to hold.	Required
valueType	It is the type of value that map m is permitted to hold.	Required

Returns

The checkedSortedMap() method returns a dynamically typesafe view of the specified Sorted Map.

Exceptions

ClassCastException

Compatibility Version

Java 1.5 and above

Example 1

import java.util.*;
public class CollectionsCheckedSortedMapExample1 {
	public static void main(String[] args) {
		//create map     
	      SortedMap<String, Integer> smap = new TreeMap<String, Integer>();
	      //Insert values in the Map
	      smap.put("JavaTpoint", 1100);
	      smap.put("Hindi100", 500);
	      smap.put("SSSIT", 1300);
	      smap.put("ABCD", 1200);
	      //Get type safe view of the sorted Map         
	      System.out.println("Type safe view of the Sorted Map is: "+Collections.checkedSortedMap(smap,String.class,Integer.class));
	      }
}

Test it Now

Output:

Type safe view of the Sorted Map is: {ABCD=1200, Hindi100=500, JavaTpoint=1100, SSSIT=1300}

Example 2

import java.util.*;
public class CollectionsCheckedSortedMapExample2 {
	public static void main(String[] args) {
		//create map     
	      SortedMap<Integer, String> smap = new TreeMap<Integer, String>();
	      //Insert values in the Map
	      smap.put(1100, "JavaTpoint");
	      smap.put(500, "Hindi100");
	      smap.put(1800, "SSSIT");
	      smap.put(900, "ABCD");
	      //Get type safe view of the sorted Map         
	      System.out.println("Type safe view of the Sorted Map is: "+Collections.checkedSortedMap(smap,Integer.class,String.class));
	      }
}

Test it Now

Output:

Type safe view of the Sorted Map is: {500=Hindi100, 900=ABCD, 1100=JavaTpoint, 1800=SSSIT}

Example 3

import java.util.*;
public class CollectionsCheckedSortedMapExample3 {
	public static void main(String[] args) {
		//create map     
	      SortedMap<Integer, String> map = new TreeMap<>();
	      map = Collections.checkedSortedMap(map,Integer.class, String.class);
	      map.put(1100, "JavaTpoint");
	      map.put(500, "Hindi100");
	      map.put(1800, "SSSIT");
	      map.put(900, "ABCD");
            //Get type safe view of sorted map
            System.out.println("Map content: "+map);
            SortedMap map2 = map;
            map2.put(5,500);        
            map2.put(6,200); //throws ClassCastException
	      }
}

Test it Now

Output:

Map content: {500=Hindi100, 900=ABCD, 1100=JavaTpoint, 1800=SSSIT}
Exception in thread "main" java.lang.ClassCastException: Attempt to insert class java.lang.Integer value into map with value type class java.lang.String
	at java.base/java.util.Collections$CheckedMap.typeCheck(Collections.java:3578)
	at java.base/java.util.Collections$CheckedMap.put(Collections.java:3621)
	at myPackage.CollectionCheckedSortedMapExample3.main(CollectionCheckedSortedMapExample3.java:15)

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