reduce() method to double characters string code example

Example 1: Write a program to input a word from the user and remove the duplicate characters present in it.

// Java program to remove duplicate/repeated characters from a string  www.getprogramcode.com
import java.util.*;
class RemoveDuplicate
{
    public static void main(String args[])
    {
	String s,ans="";
	char ch	;
	int l,i=0;
	Scanner sc=new Scanner(System.in);
        System.out.print("Enter any string: "); // Inputting the word
        s = sc.nextLine();
	l=s.length();
	s+=" ";			// *Adding extra space at the end because last character is compared with something else index out of bound error.
	ch=s.charAt(0);	// taking ch as first character
	while(i<l)
	{			 
		ans= ans+ ch;  // adding each individual character to the answer string or output string without repeated characters

		while(s.charAt(++i)==ch && i<l)
		{}
	ch=s.charAt(i);	// **to store the previously last character in ch
	}

	System.out.println("String after removing repeated characters : \n"+ans); // Printing the string without duplicate characters
	}
    }

Example 2: how to remove duplicate elements from char array in java

public static void main(String[] args) {
    Main main = new Main();
    char[] array = {'e','a','b','a','c','d','b','d','c','e'};
    main.getCharArray(array);
}

private char[] getCharArray(char[] array) {
    String _array = "";
    for(int i = 0; i < array.length; i++) {
        if(_array.indexOf(array[i]) == -1) // check if a char already exist, if not exist then return -1
            _array = _array+array[i];      // add new char
    }
    return _array.toCharArray();
}