Java: printf is not applicable for the arguments (String, double)

Question

I'm trying to compile code that I know to be working on other peoples' machines but is throwing a particular error on my system. Specifically the error relates to the printf() method

The method printf(String, Object[]) in the type PrintStream is not applicable for the arguments (String, double)

For instance

public static void main(String[] args) {

        double rate =10.5;
        System.out.printf("%.3f",  rate);
    }

Does anyone know why this error is cropping up? There are alternatives to using printf(), but this is very annoying!

Answer 1

您是否可能拥有Java编译器遵从级别1.4？

Answer 2

The funny thing is that it compiles without problem on Java 7, and prints out

10.500

It probably uses autoboxing . But omitting the issue of autoboxing - as your method accepts only Objects , and not primitives , you need to use a wrapper Double .