Drop newline characters in a string (\ r \ n \ t) in Java

Let's take a look at a few examples:

Example 1:

public class Test {

public static void Main (string[] args) {

String s = "' SDS GDASDA" + "\ n" + "Edaeafd '";
System.out.println ("Before conversion:" +s);

s = S.replaceall ("\r|\n", "");

System.out.println ("After conversion:" +s);
}
}
Output results:

Before conversion: ' SDS GDASDA
EDAEAFD '
After conversion: ' SDS GDASDAEDAEAFD '

Looking at an example:

Example 2:

System.out.println ("\ R output:" + "abc" + "\ r" + "abc");
SYSTEM.OUT.PRINTLN ("\\n Output:" + "abc" + "\ n" + "abc");

The above two sentences are in the same format as the console output:

\ r output: ABC
Abc
\ r output: ABC
Abc

So does it mean that \ r is equal to \ n?

Example 3:

public class Test {

public static void Main (string[] args) {

String s = "' SDS GDASDA" + "\ n" + "Edaeafd '";
System.out.println ("Before conversion:" +s);

s = S.replaceall ("\ R", "");

System.out.println ("After conversion:" +s);
}
}

Before conversion: ' SDS GDASDA
EDAEAFD '
After conversion: ' SDS GDASDA
EDAEAFD '

The output shows that \ r is not equal to \ n. hi.

So what's the difference between them?

Example 4:

public class Test {

public static void Main (string[] args) {

String s = "' SDS GDASDA" + "\n\r" + "Edaeafd '";

System.out.println ("Before conversion:" +s);

s = S.replaceall ("\r|\n", "");

System.out.println ("After conversion:" +s);
}
}

Output results:

Before conversion: ' SDS GDASDA

EDAEAFD '
After conversion: ' SDS GDASDAEDAEAFD '

You can see that \ r represents a carriage return, \ n represents a second line (\ r) called carriage return Carriage return; \ n = new line \ ew Line)

We can do in one experiment:

Example 5:

public class Test {

public static void Main (string[] args) {

String s = "' SDS GDASDA" + "\ r \ n" + "Edaeafd '";

System.out.println ("Before conversion:" +s);

s = S.replaceall ("\r|\n", "");

System.out.println ("After conversion:" +s);
}
}

Output results:

Before conversion: ' SDS GDASDA
EDAEAFD '
After conversion: ' SDS GDASDAEDAEAFD ' in

In Example 4 to Example 5, we just changed the position of the \n\r of the string s to \ r \ n, but found that the example 4 output resulted in one more line of space.

As for why example 4 and example 5 output will have this difference is the difference between \ r \ n and \n\r, this is a better answer on the net:

Enter+newline with different platforms:

Windows:   \ r \ n

Mac:           \ r

Unix/linux:  \ n

In "abc" + "\n\rdef", \n\r don't   match any platform,so it is considered as \ r  (which match unix/linux  and Mac), so there are two new lines.

In  "abc" + "\r\ndef"   \ r \ n matches the Windows Platform,so it is considered as only one new line.

SCIM crushed, so just 中文版.

About \ t It is equivalent to pressing the TAB key.