Java Collection, TreeMap Exercises: Sort keys in Tree Map by using comparator
Java Collection, TreeMap Exercises: Exercise-7 with Solution
Write a Java program to sort keys in Tree Map by using comparator.
Sample Solution:-
Java Code:
import java.util.*;
import java.util.Map.Entry;
public class Example7 {
public static void main(String args[]){
TreeMap<String,String> tree_map1 = new TreeMap<String,String>(new sort_key());
// Put elements to the map
tree_map1.put("C2", "Red");
tree_map1.put("C4", "Green");
tree_map1.put("C3", "Black");
tree_map1.put("C1", "White");
System.out.println(tree_map1);
}
}
class sort_key implements Comparator<String>{
@Override
public int compare(String str1, String str2) {
return str1.compareTo(str2);
}
}
Sample Output:
{C1=White, C2=Red, C3=Black, C4=Green}
Java Code Editor:
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