guava Splitter 与java 内置的string的split 方法的区别

/* @param  regex
*         the delimiting regular expression
*
* @return  the array of strings computed by splitting this string
*          around matches of the given regular expression
*
* @throws  PatternSyntaxException
*          if the regular expression's syntax is invalid
*
* @see java.util.regex.Pattern
*
* @since 1.4
* @spec JSR-51
*/
public String[] split(String regex) {
  return split(regex, 0);
}

public static Splitter on(char separator);
public static Splitter on(final CharMatcher separatorMatcher);
public static Splitter on(final String separator);
@GwtIncompatible("java.util.regex")
public static Splitter on(final Pattern separatorPattern);

@Test
public void test_string_split() {
    String[] split = "a,b,,".split(","); // java内置的会忽略空内容
    assertThat(split, equalTo(Lists.newArrayList("a", "b").toArray()));
}

@Test
public void test_guava_Splitter() {
    List<String> splitToList = Splitter.on(",").splitToList("a,b,,");//guava不会忽略

    assertThat(splitToList, equalTo(Lists.newArrayList("a", "b", "", "")));
}
 
@Test
public void test_guava_Splitter_omitEmptyStrings() {
    // 或者可以自由选择的忽略&emsp;，像java一样，忽略空字符串
    List<String> splitToList = Splitter.on(",").omitEmptyStrings().trimResults().splitToList("a,b,,");

    assertThat(splitToList, equalTo(Lists.newArrayList("a", "b")));
}