Question

How to use TreeSet in Java

Answer 1

import java.util.*; 

public class MyClass {
    public static void main(String args[]) {
        TreeSet<String> ts = new TreeSet<String>(); 
  
        ts.add("java"); 
        ts.add("php"); 
        ts.add("c"); 
        ts.add("c++"); 
        ts.add("java"); 
  
        System.out.println(ts); 
    }
}


/*
run:

[c, c++, java, php]

*/

 

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Answer 2

import java.util.*; 

public class MyClass {
    public static void main(String args[]) {
        TreeSet<String> ts = new TreeSet<String>(); 
  
        ts.add("java"); 
        ts.add("php"); 
        ts.add("c"); 
        ts.add("c++"); 
        ts.add("java"); 
  
        System.out.println(ts.first()); 
        System.out.println(ts.last()); 
    }
}


/*
run:

c
php

*/

 

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Answer 3

import java.util.*; 

public class MyClass {
    public static void main(String args[]) {
        TreeSet<Integer> ts = new TreeSet<Integer>(); 
  
        ts.add(17); 
        ts.add(83); 
        ts.add(91); 
        ts.add(22); 
        ts.add(12); 
  
        System.out.println(ts); 
        System.out.println(ts.first()); 
        System.out.println(ts.last()); 
    }
}


/*
run:

[12, 17, 22, 83, 91]
12
91

*/

 

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