append

abstract fun append(csq: CharSequence?): Appendable

abstract fun append(
    csq: CharSequence?, 
    start: Int, 
    end: Int
): Appendable

abstract fun append(c: Char): Appendable

equals

open operator fun equals(other: Any?): Boolean

Indicates whether some other object is "equal to" this one. Implementations must fulfil the following requirements:

hashCode

open fun hashCode(): Int

Returns a hash code value for the object. The general contract of hashCode is:

toString

open fun toString(): String

Returns a string representation of the object.

StringBuilder

class StringBuilder : Appendable, CharSequence