java初学中，遭遇无法从静态上下文中引用非静态 变量 this

Question

import java.util.*;

public class ComicBooks {

public ComicBooks(){

}

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    // TODO code application logic here
    HashMap quality = new HashMap();
    float price1 = 3.00F;
    quality.put("mint",price1);
    float price2 = 2.00F;
    quality.put("near mint",price2);
    float price3 = 1.50F;
    quality.put("very fine",price3);
    float price4 = 1.00F;
    quality.put("fine",price4);
    float price5 = 0.50F;
    quality.put("good",price5);
    float price6 = 0.25F;
    quality.put("poor",price6);

    Comic[] comix = new Comic[3];       
    comix[0] = new Comic("AMAZING sPIDER-MAN","1a","very fine",5_000.00F);        
    comix[0].setPrice((Float)quality.get(comix[0].condition));
    comix[1] = new Comic("Incredible Hulk","181","near mint",240.00F);        
    comix[1].setPrice((Float)quality.get(comix[1].condition));
    comix[2] = new Comic("Cerebus","1A","good ",144.00F);        
    comix[2].setPrice((Float)quality.get(comix[0].condition));

    for (Comic comix1 : comix) {
        System.out.println("Title:" + comix1.title);
        System.out.println("Issue:" + comix1.issueNumber);
        System.out.println("Condition" + comix1.condition);
        System.out.println("Price: $ " + comix1.price + "\n");
    }     

}

class Comic{
    String title;
    String issueNumber;
    String condition;
    float basePrice;
    float price;

    Comic(String inTitle,String inIssueNumber,String inCondition,
            float inBasePrice){
        title = inTitle;
        issueNumber = inIssueNumber;
        condition = inCondition;
        basePrice = inBasePrice;
    }

    void setPrice(float factor){
        price = basePrice*factor;
    }
}

}

在41行遇到无法从静态上下文中引用非静态 变量 this

Answer 1

  this变量是当前对象指针，只能在非静态方法中访问，非静态方法又叫实例对象方法，必须通过对象访问的方法,这是Java语法规定的。静态方法又叫类方法，不需要实例化而是通过类名称调用的方法，与实例无关，当然没有必要也不能访问this对象了啊。