为什么我不能只声明所有方法静态？ [英] Why can't I just declare all methods static?

问题描述

我被这个问题质疑，为什么我不能声明所有方法都是静态的？你能在这里给我一个解释吗？谢谢。

I was being questioned by this, why can't I declare all methods static? Can you give me a piece of explanation in here? Thanks.

我相信当你创建一个静态方法时，它无法访问非静态成员吗​​？

I believe that when you make a method static, it cannot access non-static members?

推荐答案

静态方法无法访问实例变量。 ：）

Static methods cannot access instance variables. :)

public class MyStaticExample{
  private String instanceVariable = "Hello";
  private static String STATIC_VARIABLE = "Hello too";

  public static void staticMethod(){
    System.out.println(this.instanceVariable); // this will result in a compilation error.
    System.out.println(STATIC_VARIABLE); // this is ok
  }

  public void instanceMethod(){
    System.out.println(this.instanceVariable); // this is ok
    System.out.println(STATIC_VARIABLE); // this is ok
  }
}

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