Java program to ignore duplicates in a string and print each character only once in ascending order

14/05/2018 Suryateja Pericherla Categories: Strings. 2 Comments

This is a Java program that accepts a string from the user, ignores any duplicate characters and prints each character only once in ascending order.

We use TreeSet class from collections framework for printing the characters in ascending order.

The program is as follows:

import java.util.*;
public class Sample 
{

	public static void main(String[] args) 
	{
		TreeSet<Character> list = new TreeSet<Character>();
		Scanner input = new Scanner(System.in);
		String s = input.next();
		for(char ch : s.toCharArray())
			list.add(ch);
		for(char ch : list)
			System.out.println(ch);
	}
}

Input:
asaabebys

Output:
a
b
e
s
y

import java.util.*;

public class Sample

{

public static void main(String[] args)

{

TreeSet<Character> list = new TreeSet<Character>();

Scanner input = new Scanner(System.in);

String s = input.next();

for(char ch : s.toCharArray())

list.add(ch);

for(char ch : list)

System.out.println(ch);

}

Input:

asaabebys

Output:

If you want to display in insertion order, you can use LinkedHashSet.

2 Comments

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led 20/05/2018

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Java program to ignore duplicates in a string and print each character only once in ascending order

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