Question

我的字符串很长，一切都正确，但是我无法获得与教授相同的输出。他的输出更加统一。所以首先我尝试做一个system.out.println（），但是那没有用。

这是我的代码：

System.out.println("Password = " + password + "\t\t" + "Newline = " + ctnline + "\t" + "Single = " + ctlength + "\t" + "Equal = " + ctequal + "\t" + "Lenght = " + ctlength2 + "\t" + "Upper = " + ctupper + "\t" + "Lower = " + ctlower + "\t" + "Special = " + (ctspec2));

这是输出：

Password = bank,Rabbither               Newline = 0     Single = 2      Equal = 0       Lenght = 1      Upper = 2       Lower = 0       Special = 1
Password = acrossShemoment,             Newline = 0     Single = 3      Equal = 0       Lenght = 2      Upper = 9       Lower = 0       Special = 0
Password = her.theyOWN          Newline = 0     Single = 6      Equal = 0       Lenght = 3      Upper = 9       Lower = 0       Special = 1
Password = ALICEeyes.said               Newline = 0     Single = 0      Equal = 0       Lenght = 0      Upper = 0       Lower = 0       Special = 0
Password = thepackKing.         Newline = 0     Single = 1      Equal = 0       Lenght = 3      Upper = 4       Lower = 0       Special = 1
Password = thethatKing.         Newline = 0     Single = 1      Equal = 0       Lenght = 0      Upper = 2       Lower = 0       Special = 0
Password = AfterWhichdear!              Newline = 0     Single = 1      Equal = 0       Lenght = 1      Upper = 3       Lower = 0       Special = 0
Password = "Silencethecrown             Newline = 0     Single = 1      Equal = 1       Lenght = 6      Upper = 8       Lower = 0       Special = 0
Password = "Silencemuchme               Newline = 0     Single = 6      Equal = 0       Lenght = 1      Upper = 6       Lower = 0       Special = 2
Password = King.nopeeped                Newline = 0     Single = 5      Equal = 0       Lenght = 2      Upper = 9       Lower = 0       Special = 2
Password = eitherKing.Soon              Newline = 0     Single = 0      Equal = 0       Lenght = 0      Upper = 0       Lower = 0       Special = 0

那是行不通的，老师在输出中将“换行符”对齐。

我需要这样的输出（老师的输出）：

Password = bank,Rabbither       Newline = 0     Single = 2      Equal = 0       Lenght = 1      Upper = 2       Lower = 0       Special = 1
Password = acrossShemoment,     Newline = 0     Single = 3      Equal = 0       Lenght = 2      Upper = 9       Lower = 0       Special = 0
Password = her.theyOWN          Newline = 0     Single = 6      Equal = 0       Lenght = 3      Upper = 9       Lower = 0       Special = 1
Password = ALICEeyes.said       Newline = 0     Single = 0      Equal = 0       Lenght = 0      Upper = 0       Lower = 0       Special = 0
Password = thepackKing.         Newline = 0     Single = 1      Equal = 0       Lenght = 3      Upper = 4       Lower = 0       Special = 1
Password = thethatKing.         Newline = 0     Single = 1      Equal = 0       Lenght = 0      Upper = 2       Lower = 0       Special = 0
Password = AfterWhichdear!      Newline = 0     Single = 1      Equal = 0       Lenght = 1      Upper = 3       Lower = 0       Special = 0
Password = "Silencethecrown     Newline = 0     Single = 1      Equal = 1       Lenght = 6      Upper = 8       Lower = 0       Special = 0
Password = "Silencemuchme       Newline = 0     Single = 6      Equal = 0       Lenght = 1      Upper = 6       Lower = 0       Special = 2
Password = King.nopeeped        Newline = 0     Single = 5      Equal = 0       Lenght = 2      Upper = 9       Lower = 0       Special = 2
Password = eitherKing.Soon      Newline = 0     Single = 0      Equal = 0       Lenght = 0      Upper = 0       Lower = 0       Special = 0

我从未学习过如何使用printf，这就是他们在寻找解决方案时如何在线显示它。打印时还有其他格式化方法是否正确。我不确定我们是否可以使用printf，因为老师从未教过它。

编辑：允许使用String.format（）方法。

Answer 1

您可以使用System.out.printf（）。它使用与String.format（）相同的代码。

System.out.printf("Password = %20s Newline = %2d Single = %d Equal = %d Lenght = %d Upper = %d Lower = %d Special = %d\n",
    password, ctnline, ctlength, ctequal, ctlength2, ctupper, ctlower, ctspec2);

格式字符串采用您喜欢的任何文本以及以％s开头的代码。您最常使用的两个是％s（一个字符串）和％d（一个十进制数字）。您可以在Google上搜索printf格式的字符串，以进行更长的讨论。％f较少出现，但仍然很重要。我将在下面讨论。

％s或％d可以采用可选长度。您会看到我完成了％20s-这意味着即使输入的字符串为空，空格也会填充到20个字符。您可以对数字做同样的事情。如果您未指定长度，则将使用所需的长度。如果您指定的不够多，它将运行很长时间。

您可以将数字填充为％03d之类的数字。例如，您将获得004而不是4。

您可以使用-操纵左对齐和右对齐。例如，％-20s。

在这一点上，我会做实验。

对于浮点数（1.5），请执行％f。

System.out.printf("%3.1f\n", 1.5);

在此示例中，3是整个宽度，1是小数点后的位置。因此％10.2f将为您提供10个字符的宽度和小数点后2点。

Answer 2

您可以使用String.format统一输出。使用String.format，您可以将文本输出长度定义为一种格式。

作为一个例子；

String firstValue = "Password = bank,Rabbither";
String secondValue = "Newline = 0";
String thirdValue = "Single = 2";
String str = String.format("%1$-20s | %2$-30s | %3$-30s",fristValue, secondValue, thirdValue);

对于1$-20s：1$表示第一个变量，-20s表示字符串的固定长度。

有没有一种方法可以格式化输出，使其输出更加均匀？

2 个答案: