Determine if there is/are escape character(s) in string

Question

Let say I have

String str="hello\" world\\";

when printing str, the output is

hello" world\

even when printing str.length() the output is

13

Is there any way to prove that str value has escape character(s)?

Answer 1

There is no such thing as escape characters at run time.

Escape characters appear only in String literals. For example,

String literal = "Some\nEscape\rSequence\\\"";

At compilation time, the compiler produces a String value with their actual binary representation (UTF-8 iirc). The JVM uses that String value directly.

You wrote

I am thinking that whenever we print a string and the output contains character such as " and \, then we can conclude that those character, " and \ was escaped?

This is not true, those characters might have been read from a file or some other InputStream. They were definitely not escaped in a text file.