JAVA split 方法的坑

1. System.out.println(":ab:cd:ef::".split(":").length);//末尾分隔符全部忽略    
2.   System.out.println(":ab:cd:ef::".split(":",-1).length);//不忽略任何一个分隔符    
3.   System.out.println(StringUtils.split(":ab:cd:ef::",":").length);//最前面的和末尾的分隔符全部都忽略,apache commons    
4.   System.out.println(StringUtils.splitPreserveAllTokens(":ab:cd:ef::",":").length);//不忽略任何一个分隔符 apache commons     
5. 输出：    
6. 4    
7. 6    
8. 3    
9. 6