“非静态变量，不能从静态上下文引用”？ [英] "non-static variable this cannot be referenced from a static context"?

问题描述

我是一名Java新手，我正试图通过递归函数部署斐波那契线，然后计算运行时间。
这里是我设法编写的代码：

I'm a Java newbie and I'm trying to deploy a fibonacci trail through recursive function and then calculate the run time. here is the code I have managed to write:

class nanoTime{
    int fib(int n){
        if(n==0) return 0;
        if(n==1) return 1;
        return this.fib(n-1)+this.fib(n-2);
    }
    public static void main(String[] args){
        double beginTime,endTime,runTime;
        int n=10;
        beginTime = System.nanoTime();
        n = this.fib(n);
        endTime = System.nanoTime();
        runTime = endTime-beginTime;
        System.out.println("Run Time:" + runTime);
    }
}

问题是当我试图把它转过来到字节码我得到以下错误：

The problem is when I'm trying to turn it into Byte-code I get the following error:

nanoTime.java:11: non-static variable this cannot be referenced from a static context

我想知道是什么问题？！

I'm wondering what is the problem?!

推荐答案

更改

n = this.fib(n);

到

n = fib(n);

并使方法 fib static。

and make the method fib static.

或者，更改

n = this.fib(n);

到

n = new nanoTime().fib(n);

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