Remover acentuação

public String trata (String passa){
    char[] array = passa.toCharArray();
    for (int i = 0; i< array.length; i++) {
        switch (array[i]) {
            case 'Â' :
            case 'À' :
            case 'Á' :
            case 'Ä' :
            case 'Ã' :
                array[i] = 'A';
                continue;
            //
            // Mais os outros case's...
            //
        }
    }
    return new String(array);
}

package org.javabb.infra;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class CharFilter {

	public static String[] REPLACES = { "a", "e", "i", "o", "u", "c" };

	public static Pattern[] PATTERNS = null;
	
	public static void compilePatterns() {
		PATTERNS = new Pattern[REPLACES.length];
		PATTERNS[0] = Pattern.compile("[âãáàä]", Pattern.CASE_INSENSITIVE);
		PATTERNS[1] = Pattern.compile("[éèêë]", Pattern.CASE_INSENSITIVE);
		PATTERNS[2] = Pattern.compile("[íìîï]", Pattern.CASE_INSENSITIVE);
		PATTERNS[3] = Pattern.compile("[óòôõö]", Pattern.CASE_INSENSITIVE);
		PATTERNS[4] = Pattern.compile("[úùûü]", Pattern.CASE_INSENSITIVE);
		PATTERNS[5] = Pattern.compile("[ç]", Pattern.CASE_INSENSITIVE);
	}

	public static String replaceSpecial(String text) {
		if(PATTERNS == null){
			compilePatterns();
		}

		String result = text;
		for (int i = 0; i < PATTERNS.length; i++) {
			Matcher matcher = PATTERNS[i].matcher(result);
			result = matcher.replaceAll(REPLACES[i]);
		}
		return result;
	}

}

package br.com.liquigas.utils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringUtils {

	public static String[] REPLACES = { "a", "e", "i", "o", "u", "c", "A", "E", "I", "O", "U", "C" };

	public static Pattern[] PATTERNS = null;

	public static void compilePatterns() {
		PATTERNS = new Pattern[REPLACES.length];
		PATTERNS[0]  = Pattern.compile("[âãáàä]");
		PATTERNS[1]  = Pattern.compile("[éèêë]");
		PATTERNS[2]  = Pattern.compile("[íìîï]");
		PATTERNS[3]  = Pattern.compile("[óòôõö]");
		PATTERNS[4]  = Pattern.compile("[úùûü]");
		PATTERNS[5]  = Pattern.compile("[ç]");
		PATTERNS[6]  = Pattern.compile("[ÂÃÁÀÄ]");
		PATTERNS[7]  = Pattern.compile("[ÉÈÊË]");
		PATTERNS[8]  = Pattern.compile("[ÍÌÎÏ]");
		PATTERNS[9]  = Pattern.compile("[ÓÒÔÕÖ]");
		PATTERNS[10] = Pattern.compile("[ÚÙÛÜ]");
		PATTERNS[11] = Pattern.compile("[Ç]");
	}

	private StringUtils() {
	}

	/**
	 * Substitui os caracteres acentuados por nao acentuados.
	 * 
	 * @param text
	 * @return
	 */
	public static String replaceSpecial(String text) {
		if (PATTERNS == null) {
			compilePatterns();
		}

		String result = text;
		for (int i = 0; i < PATTERNS.length; i++) {
			Matcher matcher = PATTERNS[i].matcher(result);
			result = matcher.replaceAll(REPLACES[i]);
		}
		return result;
	}
}

String input = "çaláda";
input = Normalizer.normalize(input, Normalizer.Form.NFD);
input = input.replaceAll("[^\\p]", "");
System.out.println(input);

public static String removeAccents(String str) {

    str = Normalizer.normalize(str, Normalizer.Form.NFD);

    str = str.replaceAll("[^\\p]", "");

    return str;

}