// null c = "computerhope"; document.write("<p>'" + c + "' " + c.length + "</p>"); // computerhope without a null character c = "computerhope\0"; document.write("<p>'" + c + "' " + c.length + "</p>"); // computerhope with a null character </script> </body...
<tab>- matches a tab character. equivalent to regex\t <return>- matches a carriage return character. equivalent to regex\r <feed>- matches a form feed character. equivalent to regex\f <null>- matches a null characther. equivalent to regex\0 ...
When you see, that instead of"For input string:"and the input, there is anull(not"null") it means, that you tried to pass the null reference to a number. If you actually want to treat is as 0 or any other number, you might be interested in my another post on StackOverflow. It...
The Unicode character to evaluate. Returns Boolean true if c is white space; otherwise, false. Remarks White space characters are the following Unicode characters: Members of the UnicodeCategory.SpaceSeparator category, which includes the characters SPACE (U+0020), NO-BREAK SPACE (U+00A0), OG...
*@since3.0 Changed signature from isEmpty(String) to isEmpty(CharSequence)*/publicstaticbooleanisEmpty(finalCharSequence cs) {returncs ==null|| cs.length() == 0; } 可以看到 " " 空格是会绕过这种空判断,因为是一个空格,并不是严格的空值,会导致isEmpty(" ")=false ...
<properties> <seata.version>2.2.0</seata.version> </properties> <dependencies><!--dependencies for non-SpringBoot application framework--><dependency> <groupId>org.apache.seata</groupId> <artifactId>seata-all</artifactId> <version>${seata.version}</version> </dependency><!--If your project...
The Unicode character to evaluate. Returns Boolean trueifcis a control character; otherwise,false. Examples The following example lists the Unicode code point of each of the control characters. C# usingSystem;publicclassControlChars{publicstaticvoidMain(){intcharsWritten =0;for(intctr =0x00; ctr ...
=null 今天在查询数据时,查到包含一条某个时间startTime(该字段默认为null ) 为null的记录,想把它过滤,加了startTime!= null 的条件,结果记录都没了,应该用条件 is not null。 转自: MySQL null与not null和null与空值''的区别https://segmentfault.com/a/1190000009540449...
return Character.isLowerCase(firstChar.toCharArray()[0]) && Character.isUpperCase(setGetName.substring(1, 2).toCharArray()[0]) ? firstChar.toLowerCase() + setGetName.substring(1) : firstChar.toUpperCase() + setGetName.substring(1);
returncs == null || cs.length() == 0; } StringUtils.isNotEmpty() 相当于不为空 ,= !isEmpty()。 public static boolean isNotEmpty(final CharSequence cs) { return!isEmpty(cs); } StringUtils.isAnyEmpty() 是否有一个为空,只...