numberPresent && upperCasePresent && lowerCasePresent && specialCharacterPresent; } We should note a few things here. Basic idea is that we iterate through ourStringand check if its characters are of required types. By usingCharacterclass, we can easily check if a certain character is a digit,...
publicclassUpperCaseChecker{publicstaticbooleanstartsWithUpperCase(Stringinput){if(input==null||input.isEmpty()){returnfalse;// 如果字符串为空,返回 false}charfirstChar=input.charAt(0);// 获取字符串的第一个字符returnCharacter.isUpperCase(firstChar);// 判断是否为大写字母}publicstaticvoidmain(String[]...
Is Whitespace: true Is Uppercase: false Is Lowercase: false --- Character: # Is Letter: false Is Digit: false Is Whitespace: false Is Uppercase: false Is Lowercase: false --- 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23....
List upperCaseNames =newArrayList<>(); for(String name : names) { upperCaseNames.add(name.toUpperCase()); } 我们可以通过流和方法引用来简化它: List names = Arrays.asList("ross", "joey", "chandler"); List upperCaseNames = names .stream() .map(String::toUpperCase) .collect(Collectors.to...
)<10;Predicate<String>eq=pwd->pwd.equals("password");booleanresult=opt.map(String::toLowerCase...
default:default 关键字用于指定 switch 语句中除去 case 条件之外的默认代码块。 do:do 关键字通常和 while 关键字配合使用,do 后紧跟循环体。 double:double 关键字用于声明一个可以容纳 64 位浮点数的变量。 else:else 关键字用于指示 if 语句中的备用分支。
java.io.File类:文件和文件目录路径的抽象表示形式,与平台无关。 File能新建,删除,重命名文件和目录,但File不能访问文件内容本身。如果需要访问文件内容本身,则需要使用输入/输出流。 想要在Java程序中表示一个真实存在的文件或目录,那么必须有一个File对象,但是Java程序中的一个File对象,可能没有一个真实存在的文件...
A task can be represented as a list item where the first non-whitespace character is a left bracket[, then a single whitespace character or the letterxin lowercase or uppercase, then a right bracket]followed by at least one whitespace before any other content. ...
}//Unfortunately, conversion to uppercase does not work properly//for the Georgian alphabet, which has strange rules about case//conversion. So we need to make one last check before//exiting.if(Character.toLowerCase(u1) ==Character.toLowerCase(u2)) {continue; ...
@echo off rem This file generated by Jython installer rem JAVA_HOME=<java_home> rem rem collect all arguments into %ARGS% set ARGS= :loop if [%1] == [] goto end set ARGS=%ARGS% %1 shift goto loop :end %JAVA_HOME%\bin\java.exe -Dpython.home=C:\jython-2.1 -cp "C:\jython-...