Java: Remove and get a key-value mapping associated with the least key in a map
Java Collection, TreeMap Exercises: Exercise-19 with Solution
Write a Java program to remove and get a key-value mapping associated with the least key in a map.
Sample Solution:-
Java Code:
import java.util.*;
import java.util.Map.Entry;
public class Example19 {
public static void main(String args[]) {
// Create a tree map
TreeMap < Integer, String > tree_map = new TreeMap < Integer, String > ();
// Put elements to the map
tree_map.put(10, "Red");
tree_map.put(20, "Green");
tree_map.put(40, "Black");
tree_map.put(50, "White");
tree_map.put(60, "Pink");
// polling first entry
System.out.println("Value before poll: " + tree_map);
System.out.println("Value returned: " + tree_map.pollFirstEntry());
System.out.println("Value after poll: " + tree_map);
}
}
Sample Output:
Value before poll: {10=Red, 20=Green, 40=Black, 50=White, 60=Pink} Value returned: 10=Red Value after poll: {20=Green, 40=Black, 50=White, 60=Pink}
Java Code Editor:
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Java: Tips of the Day
Java Classes
A Java class is declared with the keywords public class along with a unique class name mirroring its file name. For example, in a file Hello.java in project helloworld:
package helloworld; import javax.swing.*; import java.awt.*; import java.awt.event.*; /** * @author seth * A GUI hello world. */ public class Hello { // this is an empty class }
You can declare variables and functions inside a class. In Java, variables within a class are called fields.
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