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:Â
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public static SortedMap checkedSortedMap(SortedMap m, Class keyType, Class valueType)
Parameters: This method takes the following argument as a parameterÂ
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- 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:Â
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Java
// Java program to demonstrate// checkedSortedMap() method// for <String, String> typeÂ
import java.util.*;Â
public class GFG1 {    public static void main(String[] argv)        throws Exception    {        try {Â
            // creating object of SortedMap<String, String>            SortedMap<String, String>                smap = new TreeMap<String, String>();Â
            // Adding element to smap            smap.put("Ram", "Gopal");            smap.put("Karan", "Arjun");            smap.put("Karn", "Veer");Â
            // printing the sorted map            System.out.println("Sorted map:\n"                               + smap);Â
            // create typesafe view of the specified map            SortedMap<String, String>                tsmap = Collections                            .checkedSortedMap(smap,Â
<strong>Output:</strong><pre>{Karan=39, Karn=40, Ram=20}</pre>                                              String.class,                                              String.class);Â
            // printing the typesafe view of specified sorted map            System.out.println("Typesafe view of sorted map:\n"                               + tsmap);        }Â
        catch (IllegalArgumentException e) {            System.out.println("Exception thrown : " + e);        }    }} |
Output:Â
Sorted map:
{Karan=Arjun, Karn=Veer, Ram=Gopal}
Typesafe view of sorted map:
{Karan=Arjun, Karn=Veer, Ram=Gopal}
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Example 2:Â
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Java
// Java program to demonstrate// checkedSortedMap() method// for <String, Integer> typeÂ
import java.util.*;Â
public class GFG1 {    public static void main(String[] argv) throws Exception    {        try {Â
            // creating object of SortedMap<String, Integer>            SortedMap<String, Integer> smap = new TreeMap<String, Integer>();Â
            // Adding element 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);Â
            // create typesafe view of the specified map            SortedMap<String, Integer>                tsmap = Collections                            .checkedSortedMap(smap,                                              String.class,                                              Integer.class);Â
            // printing the typesafe view of specified sorted map            System.out.println("Typesafe view of sorted map:\n"                               + tsmap);        }        catch (IllegalArgumentException e) {Â
            System.out.println("Exception thrown : " + e);        }    }} |
Output:Â
Sorted map:
{Karan=39, Karn=40, Ram=20}
Typesafe view of sorted map:
{Karan=39, Karn=40, Ram=20}
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