我查看了所有答案，发现所有答案都是第三方许可或基于正则表达式的。

下面是我使用的一个很好的哑实现：

/**
 * Separates a string into pieces using
 * case-sensitive-non-regex-char-separators.
 * <p>
 * &nbsp;&nbsp;<code>separate("12-34", '-') = "12", "34"</code><br>
 * &nbsp;&nbsp;<code>separate("a-b-", '-') = "a", "b", ""</code>
 * <p>
 * When the separator is the first character in the string, the first result is
 * an empty string. When the separator is the last character in the string the
 * last element will be an empty string. One separator after another in the
 * string will create an empty.
 * <p>
 * If no separators are set the source is returned.
 * <p>
 * This method is very fast, but it does not focus on memory-efficiency. The memory
 * consumption is approximately double the size of the string. This method is
 * thread-safe but not synchronized.
 *
 * @param source    The string to split, never <code>null</code>.
 * @param separator The character to use as splitting.
 * @return The mutable array of pieces.
 * @throws NullPointerException When the source or separators are <code>null</code>.
 */
public final static String[] separate(String source, char... separator) throws NullPointerException {
    String[] resultArray = {};
    boolean multiSeparators = separator.length > 1;
    if (!multiSeparators) {
        if (separator.length == 0) {
            return new String[] { source };
        }
    }
    int charIndex = source.length();
    int lastSeparator = source.length();
    while (charIndex-- > -1) {
        if (charIndex < 0 || (multiSeparators ? Arrays.binarySearch(separator, source.charAt(charIndex)) >= 0 : source.charAt(charIndex) == separator[0])) {
            String piece = source.substring(charIndex + 1, lastSeparator);
            lastSeparator = charIndex;
            String[] tmp = new String[resultArray.length + 1];
            System.arraycopy(resultArray, 0, tmp, 1, resultArray.length);
            tmp[0] = piece;
            resultArray = tmp;
        }
    }
    return resultArray;
}

直接处理字符串的另一种方法是将正则表达式与捕获组一起使用。这样做的优点是，它可以直接暗示对输入的更复杂的约束。例如，以下命令将字符串拆分为两部分，并确保两者仅由数字组成：

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

class SplitExample
{
    private static Pattern twopart = Pattern.compile("(\\d+)-(\\d+)");

    public static void checkString(String s)
    {
        Matcher m = twopart.matcher(s);
        if (m.matches()) {
            System.out.println(s + " matches; first part is " + m.group(1) +
                               ", second part is " + m.group(2) + ".");
        } else {
            System.out.println(s + " does not match.");
        }
    }

    public static void main(String[] args) {
        checkString("123-4567");
        checkString("foo-bar");
        checkString("123-");
        checkString("-4567");
        checkString("123-4567-890");
    }
}

由于模式在本例中是固定的，因此可以预先编译并存储为静态成员（在示例中是在类加载时初始化的）。正则表达式为：

(\d+)-(\d+)

括号表示捕获组；可以通过Match.group（）方法访问与正则表达式的该部分匹配的字符串，如图所示。\d匹配一个十进制数字，+表示“匹配一个或多个前一个表达式）。-没有特殊含义，因此只匹配输入中的字符。请注意，当将其写成Java字符串时，需要对反斜杠进行双转义。其他一些示例：

([A-Z]+)-([A-Z]+)          // Each part consists of only capital letters 
([^-]+)-([^-]+)            // Each part consists of characters other than -
([A-Z]{2})-(\d+)           // The first part is exactly two capital letters,
                           // the second consists of digits

你也可以这样做

 String concatenated_String="hi^Hello";

 String split_string_array[]=concatenated_String.split("\\^");

对于简单的用例，String.split（）应该完成这项工作。如果您使用番石榴，还有一个Splitter类，它允许链接不同的字符串操作并支持CharMatcher：

Splitter.on('-')
       .trimResults()
       .omitEmptyStrings()
       .split(string);

使用org.apache.commons.lang.StringUtils的拆分方法，该方法可以根据要拆分的字符或字符串拆分字符串。

方法签名：

public static String[] split(String str, char separatorChar);

在您的情况下，当出现“-”时，您希望拆分字符串。

您可以简单地执行以下操作：

String str = "004-034556";

String split[] = StringUtils.split(str,"-");

输出：

004
034556

假设字符串中不存在-，则返回给定的字符串，并且不会出现任何异常。

// This leaves the regexes issue out of question
// But we must remember that each character in the Delimiter String is treated
// like a single delimiter        

public static String[] SplitUsingTokenizer(String subject, String delimiters) {
   StringTokenizer strTkn = new StringTokenizer(subject, delimiters);
   ArrayList<String> arrLis = new ArrayList<String>(subject.length());

   while(strTkn.hasMoreTokens())
      arrLis.add(strTkn.nextToken());

   return arrLis.toArray(new String[0]);
}