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 characte

Answer 1

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  StringBuilderPlus append(T t) {
        stringBuilder.append(t);
        return this;
    }

    public  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();