Collections checkedSortedMap() method in Java with Examples

The checkedSortedMap() method of java.util.Collections class is used to return a dynamically typesafe view of the specified sorted map.

The returned map will be serializable if the specified map is serializable.

Since null is considered to be a value of any reference type, the returned map permits insertion of null keys or values whenever the backing map does.

Syntax:

public static  SortedMap
 checkedSortedMap(SortedMap m, Class keyType, Class valueType)

Parameters: This method takes the following argument as a parameter

m – the map for which a dynamically typesafe view is to be returned
keyType – the type of key that m is permitted to hold
valueType – the type of value that m is permitted to hold

Return Value: This method returns a dynamically typesafe view of the specified map.

Below are the examples to illustrate the checkedSortedMap() method

Example 1:

// Java program to demonstrate 
// checkedSortedMap() method 
// for <String, String> type 
  
import java.util.*; 
  
public class GFG1 { 
    public static void main(String[] argv) 
        throws Exception 
    { 
        try { 
  
            // creating object of SortedMap<String, String> 
            SortedMap<String, String> 
                smap = new TreeMap<String, String>(); 
  
            // Adding elemnet to smap 
            smap.put("Ram", "Gopal"); 
            smap.put("Karan", "Arjun"); 
            smap.put("Karn", "Veer"); 
  
            // printing the sorted map 
            System.out.println("Sorted map:\n"
                               + smap); 
  
            // create typesafe view of the specified map 
            SortedMap<String, String> 
                tsmap = Collections 
                            .checkedSortedMap(smap, 
  
<strong>Output:</strong> 
<pre>{Karan=39, Karn=40, Ram=20}</pre> 
                                              String.class, 
                                              String.class); 
  
            // printing the typesafe view of specified sorted map 
            System.out.println("Typesafe view of sorted map:\n"
                               + tsmap); 
        } 
  
        catch (IllegalArgumentException e) { 
            System.out.println("Exception thrown : " + e); 
        } 
    } 
} 

Output:

Sorted map:
{Karan=Arjun, Karn=Veer, Ram=Gopal}
Typesafe view of sorted map:
{Karan=Arjun, Karn=Veer, Ram=Gopal}

Example 2:

// Java program to demonstrate 
// checkedSortedMap() method 
// for <String, Integer> type 
  
import java.util.*; 
  
public class GFG1 { 
    public static void main(String[] argv) throws Exception 
    { 
        try { 
  
            // creating object of SortedMap<String, Integer> 
            SortedMap<String, Integer> smap = new TreeMap<String, Integer>(); 
  
            // Adding elemnet to smap 
            smap.put("Ram", 20); 
            smap.put("Karan", 39); 
            smap.put("Karn", 40); 
            // printing the sorted map 
            System.out.println("Sorted map:\n"
                               + smap); 
  
            // create typesafe view of the specified map 
            SortedMap<String, Integer> 
                tsmap = Collections 
                            .checkedSortedMap(smap, 
                                              String.class, 
                                              Integer.class); 
  
            // printing the typesafe view of specified sorted map 
            System.out.println("Typesafe view of sorted map:\n"
                               + tsmap); 
        } 
        catch (IllegalArgumentException e) { 
  
            System.out.println("Exception thrown : " + e); 
        } 
    } 
} 

Output:

Sorted map:
{Karan=39, Karn=40, Ram=20}
Typesafe view of sorted map:
{Karan=39, Karn=40, Ram=20}

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