java Java中formfeed和backspace转义字符串有什么用？
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What is the use of formfeed and backspace escape strings in Java?
提问by GrowinMan
Is there any practical usage for \rand \bin Java? Could someone give an example where it's used?
在 Java 中\r和\b在 Java 中是否有任何实际用途？有人可以举一个例子吗？
采纳答案by aioobe
I usually use \rtogether with System.out.printwhen printing some progress percentage.
我通常在打印一些进度百分比时\r一起使用System.out.print。
Try running this in your terminal:
尝试在您的终端中运行它：
class Test {
public static void main(String[] args) throws InterruptedException {
for (int i = 0; i < 100; i++) {
System.out.print("Progress: " + i + " %\r");
Thread.sleep(100);
}
}
}
回答by squidge
Formfeed escape is \f, not \r. The former is useful for clearing the screen in a console, whilst the second is useful for progress displays (as stated by aioobe).
换页转义是\f，不是\r。前者对于清除控制台中的屏幕很有用，而第二个对于进度显示很有用（如 aioobe 所述）。
\bcan be used in progress displays also, for example, on a ICMP Ping, you could display a dot when a ping is sent and a \bwhen it is received to indicate the amount of packet loss.
\b也可以在进度显示中使用，例如，在 ICMP Ping 上，您可以在发送 ping 和\b接收到ping 时显示一个点，以指示数据包丢失量。
回答by Rohan Gupta
Form feed is \fand \ris carriage return.
\fis used for printing characters after it from new line starting just below previous character.
换页是\f和\r是回车。
\f用于从前一个字符下方的新行开始打印其后的字符。
System.out.println("This is before\fNow new line");
System.out.println("TEXTBEFORE\rOverlap");
System.out.println("12\b3");
Output:
输出：
This is before
Now new line
OverlapORE
13
