How to append a newline to StringBuilder

Question

I have a StringBuilder object   StringBuilder result   new StringBuilder    result append someChar     Now I want to append a newline character to the StringBuilder  How can I do it   result append   n       Does not work  So  I was thinking about writing a newline using Unicode  Will this help  If so  how can I add one

User · Answer

I create original class that similar to StringBuidler and can append line by calling method appendLine(String str).

public class StringBuilderPlus {

    private StringBuilder sb;

    public StringBuilderPlus(){
         sb = new StringBuilder();
    }

    public void append(String str)
    {
        sb.append(str != null ? str : "");
    }

    public void appendLine(String str)
    {
        sb.append(str != null ? str : "").append(System.getProperty("line.separator"));
    }

    public String toString()
    {
        return sb.toString();
    }
}

Usage:

StringBuilderPlus sb = new StringBuilderPlus();
sb.appendLine("aaaaa");
sb.appendLine("bbbbb");
System.out.println(sb.toString());

Console:

aaaaa
bbbbb

User · Answer

Another option is to use Apache Commons StrBuilder  which has the functionality that s lacking in StringBuilder   StrBuilder appendLn    As of version 3 6 StrBuilder has been deprecated in favour of TextStringBuilder which has the same functionality

User · Answer

It should be   r append   n      But I recommend you to do as below   r append System getProperty  line separator       System getProperty  line separator   gives you system-dependent newline in java  Also from Java 7 there s a method that returns the value directly  System lineSeparator

User · Answer

In addition to K S s response of creating a StringBuilderPlus class and utilising ther  adapter pattern to extend a final class  if you make use of generics and return the StringBuilderPlus object in the new append and appendLine methods  you can make use of the StringBuilders many append methods for all different types  while regaining the ability to string string multiple append commands together  as shown below  public class StringBuilderPlus        private final StringBuilder stringBuilder       public StringBuilderPlus             this stringBuilder   new StringBuilder               public  lt T gt  StringBuilderPlus append T t            stringBuilder append t           return this             public  lt T gt  StringBuilderPlus appendLine T t            stringBuilder append t  append System lineSeparator             return this              Override     public String toString             return stringBuilder toString               public StringBuilder getStringBuilder             return stringBuilder            you can then use this exactly like the original StringBuilder class   StringBuilderPlus stringBuilder   new StringBuilderPlus    stringBuilder appendLine  test        appendLine  c        appendLine 1       appendLine 1 2       appendLine 1L    stringBuilder toString

User · Answer

For Kotlin  StringBuilder   appendLine  quot your text quot    Though this is a java question  this is also the first google result for Kotlin  might come in handy

User · Answer

you can use line seperator for appending new line in

User · Answer

Escape should be done with    not     So r append   n    or r append   n    will work  StringBuilder has overloaded methods for char and String type

User · Answer

You can also use the line separator character in String format  See java util Formatter   which is also platform agnostic     i e    result append String format   n           If you need to add more line spaces  just use   result append String format   n n           You can also use StringFormat to format your entire string  with a newline s  at the end   result append String format   10s n n    This is my string

[java] How to append a newline to StringBuilder

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