如何在Java中打印转义字符 [英] How do I print escape characters in Java

问题描述

当我有一个字符串如：

String x = "hello\nworld";

如何让Java打印实际的转义字符（而不是将其解释为转义字符）什么时候使用System.out？

How do I get Java to print the actual escape character (and not interpret it as an escape character) when using System.out?

例如，当调用时

System.out.print(x);

我希望看到：

hello\nworld

而不是：

hello
world

编辑：
我很抱歉，我应该澄清这个问题。我无法控制'x'是什么，它可能是我从文件中读取的字符串。我希望x在正常程序执行期间保留其转义字符，但出于调试目的，我希望看到实际的转义字符。

My apologies, I should clarify the question. I have no control over what 'x' is going to be, it may be a string I read from a file. I would like for x to retain its escape characters during normal program execution, but for debugging purposes I would like to see the actual escape characters.

编写一个方法而且每个逃脱角色都有点矫枉过正。是否有比PrintStream更好的打印库为我这样做？

Writing a method that subs each and every escape character seems overkill. Isn't there a better printing library other than PrintStream that does this for me?

如果您熟悉Ruby，请考虑x.inspect（）

If you're familiar with Ruby, think x.inspect()

推荐答案

一种方法是：

public static String unEscapeString(String s){
    StringBuilder sb = new StringBuilder();
    for (int i=0; i<s.length(); i++)
        switch (s.charAt(i)){
            case '\n': sb.append("\\n"); break;
            case '\t': sb.append("\\t"); break;
            // ... rest of escape characters
            default: sb.append(s.charAt(i));
        }
    return sb.toString();
}

你运行 System.out.print（unEscapeString （x））。

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