Read/write are/is not used in case of applet.
A Java applet was a small application that is written in the Java programming language, or another programming language that compiles to Java byte code, and delivered to users in the form of Java byte code. The user launched the Java applet from a web page, and the applet was then executed within a java virtual machine (JVM) in process separate from the web browser itself.
An applet cannot ordinarily read or write files on the execution host.