检查java中的行是否为空?
问题描述:
可能重复:
如何检查Java String是不是所有的空格
Scanner kb = new Scanner(System.in);
String random;
System.out.print("Enter your word: ");
random = kb.nextLine();
if (random.isEmpty()) {
System.out.println("No input detected!");
} else {
System.out.println(random);
}
以上代码不考虑用户何时腾出空间。当用户腾出空格并按下回车键时,它仍然会打印空白行。
The above code doesn't account for when the user makes a space. It'll still print the blank line, when the user does a space and presses enter.
我该如何解决这个问题?
How do I fix this?
答
您可以使用 String#trim()
方法,然后进行测试: -
You can trim the whitespaces using String#trim()
method, and then do the test: -
if (random.trim().isEmpty())