String a = "123sdffff,,dddd,";
        String[] b = StringUtils.split(a, ",");
        System.out.println(Arrays.toString(b) + "-----------split");
        String[] c = StringUtils.splitByWholeSeparator(a, ",");
        System.out.println(Arrays.toString(c)+ "-----------splitByWholeSeparator");
        String[] g = StringUtils.splitByWholeSeparatorPreserveAllTokens(a, ",");
        System.out.println(Arrays.toString(g)+ "-----------splitByWholeSeparatorPreserveAllTokens");
        String[] d = StringUtils.splitPreserveAllTokens(a, ",");
        System.out.println(Arrays.toString(d)+ "-----------splitPreserveAllTokens");
        String[] e = StringUtils.splitByCharacterType(a);
        System.out.println(Arrays.toString(e)+ "-----------splitByCharacterType");
        String[] f = StringUtils.splitByCharacterTypeCamelCase(a);
        System.out.println(Arrays.toString(f)+ "-----------splitByCharacterTypeCamelCase");
        String[] h = StringUtils.splitPreserveAllTokens(a);
        System.out.println(Arrays.toString(h)+ "-----------splitPreserveAllTokens(a)");

运行结果：

[123sdffff, dddd]-----------split
[123sdffff, dddd, ]-----------splitByWholeSeparator
[123sdffff, , dddd, ]-----------splitByWholeSeparatorPreserveAllTokens
[123sdffff, , dddd, ]-----------splitPreserveAllTokens
[123, sdffff, ,,, dddd, ,]-----------splitByCharacterType
[123, sdffff, ,,, dddd, ,]-----------splitByCharacterTypeCamelCase
[123sdffff,,dddd,]-----------splitPreserveAllTokens(a)

结果显示：

split()方法： 分割字符串过程中会自动忽略所有的空项；

splitByWholeSeparator方法：分割字符串过程中会忽略中间的空项，保留末尾的空项；

splitByWholeSeparatorPreserveAllToKens方法及splitPreserveAllToKens方法作用相同：分割字符串过程中会按照每个分隔符进行分割，不忽略任何空白项；

splitByCharacterType方法及splitByCharacterTypeCamelCase方法：按照字符类型进行分割。