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/* package whatever; // don't place package name! */
 
import java.util.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static String Remove(String str, Map<Character , Integer> what){
 
        // Definimos la vqariable retornada y una estructura de datos (hash table)
        // que contendra el caracter y las veces que será borrado de la cadena
        StringBuilder result = null;
        what= new HashMap<Character, Integer>();
 
        // Bucle que recorre la cadena y va añadiendo las letras y sumando (borrando) las
        // coincidencias
        for ( int i = 0; i < str.length(); i++ ) {
            if ( what.containsKey ( str.charAt ( i ) ) ) {
                what.put ( str.charAt ( i ), what.remove ( str.charAt ( i ) ) + 1 );
            } else {
                what.put ( str.charAt ( i ), 1 );
            }
        }
 
        Set<Map.Entry<Character, Integer>> freq = what.entrySet();
 
        Iterator<Map.Entry<Character, Integer>> it = freq.iterator();
 
        // Mostramos el resultado en la pantalla
        while ( it.hasNext() ) {
            Map.Entry<Character, Integer> item = it.next();
            result.append(str);
 
            System.out.println(item.getValue());
        }
 
        return result.toString();
    }
 
	public static void main (String[] args) throws java.lang.Exception
	{
		Ideone.Remove("this is a string", new HashMap<Character, Integer>() { {'t', 1 }, {'i', 2 }}); // --> "hs s a string"
		Ideone.Remove("hello world", new HashMap<Character, Integer>() { { 'x',5 }, {'i',2 }}); // --> "hello world"
		Ideone.Remove("apples and bananas", new HashMap<Character, Integer>() { {'a', 50 }, {'n', 1 }}); // --> "pples d bnns"
	}
}

Main.java:42: error: not a statement
		Ideone.Remove("this is a string", new HashMap<Character, Integer>() { {'t', 1 }, {'i', 2 }}); // --> "hs s a string"
		                                                                       ^
Main.java:42: error: ';' expected
		Ideone.Remove("this is a string", new HashMap<Character, Integer>() { {'t', 1 }, {'i', 2 }}); // --> "hs s a string"
		                                                                          ^
Main.java:42: error: illegal start of type
		Ideone.Remove("this is a string", new HashMap<Character, Integer>() { {'t', 1 }, {'i', 2 }}); // --> "hs s a string"
		                                                                               ^
Main.java:42: error: ';' expected
		Ideone.Remove("this is a string", new HashMap<Character, Integer>() { {'t', 1 }, {'i', 2 }}); // --> "hs s a string"
		                                                                                ^
Main.java:42: error: illegal start of type
		Ideone.Remove("this is a string", new HashMap<Character, Integer>() { {'t', 1 }, {'i', 2 }}); // --> "hs s a string"
		                                                                                  ^
Main.java:42: error: <identifier> expected
		Ideone.Remove("this is a string", new HashMap<Character, Integer>() { {'t', 1 }, {'i', 2 }}); // --> "hs s a string"
		                                                                                     ^
Main.java:42: error: ';' expected
		Ideone.Remove("this is a string", new HashMap<Character, Integer>() { {'t', 1 }, {'i', 2 }}); // --> "hs s a string"
		                                                                                      ^
Main.java:42: error: ')' expected
		Ideone.Remove("this is a string", new HashMap<Character, Integer>() { {'t', 1 }, {'i', 2 }}); // --> "hs s a string"
		                                                                                          ^
Main.java:42: error: illegal start of expression
		Ideone.Remove("this is a string", new HashMap<Character, Integer>() { {'t', 1 }, {'i', 2 }}); // --> "hs s a string"
		                                                                                           ^
Main.java:43: error: not a statement
		Ideone.Remove("hello world", new HashMap<Character, Integer>() { { 'x',5 }, {'i',2 }}); // --> "hello world"
		                                                                   ^
Main.java:43: error: ';' expected
		Ideone.Remove("hello world", new HashMap<Character, Integer>() { { 'x',5 }, {'i',2 }}); // --> "hello world"
		                                                                      ^
Main.java:43: error: illegal start of type
		Ideone.Remove("hello world", new HashMap<Character, Integer>() { { 'x',5 }, {'i',2 }}); // --> "hello world"
		                                                                          ^
Main.java:43: error: ';' expected
		Ideone.Remove("hello world", new HashMap<Character, Integer>() { { 'x',5 }, {'i',2 }}); // --> "hello world"
		                                                                           ^
Main.java:43: error: illegal start of type
		Ideone.Remove("hello world", new HashMap<Character, Integer>() { { 'x',5 }, {'i',2 }}); // --> "hello world"
		                                                                             ^
Main.java:43: error: <identifier> expected
		Ideone.Remove("hello world", new HashMap<Character, Integer>() { { 'x',5 }, {'i',2 }}); // --> "hello world"
		                                                                                ^
Main.java:43: error: ';' expected
		Ideone.Remove("hello world", new HashMap<Character, Integer>() { { 'x',5 }, {'i',2 }}); // --> "hello world"
		                                                                                 ^
Main.java:43: error: ')' expected
		Ideone.Remove("hello world", new HashMap<Character, Integer>() { { 'x',5 }, {'i',2 }}); // --> "hello world"
		                                                                                    ^
Main.java:43: error: illegal start of expression
		Ideone.Remove("hello world", new HashMap<Character, Integer>() { { 'x',5 }, {'i',2 }}); // --> "hello world"
		                                                                                     ^
Main.java:44: error: not a statement
		Ideone.Remove("apples and bananas", new HashMap<Character, Integer>() { {'a', 50 }, {'n', 1 }}); // --> "pples d bnns"
		                                                                         ^
Main.java:44: error: ';' expected
		Ideone.Remove("apples and bananas", new HashMap<Character, Integer>() { {'a', 50 }, {'n', 1 }}); // --> "pples d bnns"
		                                                                            ^
Main.java:44: error: illegal start of type
		Ideone.Remove("apples and bananas", new HashMap<Character, Integer>() { {'a', 50 }, {'n', 1 }}); // --> "pples d bnns"
		                                                                                  ^
Main.java:44: error: ';' expected
		Ideone.Remove("apples and bananas", new HashMap<Character, Integer>() { {'a', 50 }, {'n', 1 }}); // --> "pples d bnns"
		                                                                                   ^
Main.java:44: error: illegal start of type
		Ideone.Remove("apples and bananas", new HashMap<Character, Integer>() { {'a', 50 }, {'n', 1 }}); // --> "pples d bnns"
		                                                                                     ^
Main.java:44: error: <identifier> expected
		Ideone.Remove("apples and bananas", new HashMap<Character, Integer>() { {'a', 50 }, {'n', 1 }}); // --> "pples d bnns"
		                                                                                        ^
Main.java:44: error: ';' expected
		Ideone.Remove("apples and bananas", new HashMap<Character, Integer>() { {'a', 50 }, {'n', 1 }}); // --> "pples d bnns"
		                                                                                         ^
Main.java:44: error: ')' expected
		Ideone.Remove("apples and bananas", new HashMap<Character, Integer>() { {'a', 50 }, {'n', 1 }}); // --> "pples d bnns"
		                                                                                             ^
Main.java:44: error: illegal start of expression
		Ideone.Remove("apples and bananas", new HashMap<Character, Integer>() { {'a', 50 }, {'n', 1 }}); // --> "pples d bnns"
		                                                                                              ^
27 errors

Standard output is empty