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Java TreeSet last() Method

The Java TreeSet last() method is used to return the last (highest) element currently in this set.

Following is the declaration for java.util.TreeSet.last() method.

public E last()

NA

The method call returns the last (highest) element currently in this set.

NoSuchElementException − This exception is thrown if this set is empty.

The following example shows the usage of Java TreeSet last() method to get the last (highest) element currently in this set. We've created a TreeSet object of Integer. Few entries are added using add() method and last/highest element is retrieved using last() method and printed.

package com.tutorialspoint;

import java.util.TreeSet;

public class TreeSetDemo {
   public static void main(String[] args) {

      // creating a TreeSet 
      TreeSet<Integer> treeset = new TreeSet<>();

      // adding in the tree set
      treeset.add(1);
      treeset.add(13);
      treeset.add(17);
      treeset.add(2);

      // displaying the last highest element
      System.out.println("Last highest element: "+treeset.last());    
   }    
}

Let us compile and run the above program, this will produce the following result.

Last highest element: 17 

The following example shows the usage of Java TreeSet last() method to get the last (highest) element currently in this set. We've created a TreeSet object of String. Few entries are added using add() method and last/highest element is retrieved using last() method and printed.

package com.tutorialspoint;

import java.util.TreeSet;

public class TreeSetDemo {
   public static void main(String[] args) {

      // creating a TreeSet 
      TreeSet<String> treeset = new TreeSet<>();

      // adding in the tree set
      treeset.add("A");
      treeset.add("D");
      treeset.add("C");
      treeset.add("B");

      // displaying the last highest element
      System.out.println("Last highest element: "+treeset.last());    
   }    
}

Let us compile and run the above program, this will produce the following result.

Last highest element: D 

The following example shows the usage of Java TreeSet last() method to get the last (highest) element currently in this set. We've created a TreeSet object of Student. Few entries are added using add() method and last/highest element is retrieved using last() method and printed.

package com.tutorialspoint;

import java.util.TreeSet;

public class TreeSetDemo {
   public static void main(String[] args) {

      // creating a TreeSet 
      TreeSet<Student> treeset = new TreeSet<>();

      // adding in the tree set
      treeset.add(new Student(1, "Robert"));
      treeset.add(new Student(2, "Julie"));
      treeset.add(new Student(3, "Adam"));
      treeset.add(new Student(4, "Julia"));

      // displaying the last highest element
      System.out.println("Last highest element: "+treeset.last());    
   }    
}
class Student implements Comparable<Student> {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }
   
   @Override
   public boolean equals(Object obj) {
      Student s = (Student)obj;
      return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name);
   }

   @Override
   public int compareTo(Student student) {
      return this.rollNo - student.rollNo;
   }
}

Let us compile and run the above program, this will produce the following result.

Last highest element: [ 4, Julia ]

java_util_treeset.htm

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