我有一个名为'Items'的类,'Equips'从'Equips'扩展而'Helmet'从'Equips'扩展。我有一个名为'getStats'的方法,它从.txt文件加载项目的统计信息。如果我将'getStats'方法放在'Items'类中,那么无论我尝试使用'this'在'Helmet'对象中访问哪个字段。显示为空。当头盔在加载文本文件之前创建时,我试图在“头盔”中访问的字段被初始化。我可以很容易地将'getStats'方法放在'Equips'类中,并在'Items'类中放置一个空白的'getStats'方法,但我想知道是否有办法让它工作。提前致谢!在java中使用'this'关键字扩展类
Items.java:
package com.projects.aoa;
import static com.projects.aoa.Print.*;
import java.util.*;
import java.io.*;
class Items {
String name, type;
int id;
int hp, mp, str, def;
boolean vacent;
static void getAllStats(Items[] e){
for(Items i : e){
getItemStats(i);
}
}
static void getItemStats(Items i){
i.getStats();
}
void getStats(){
try {
//System.out.println(System.getProperty("user.dir"));
print(this.name); //THIS shows up as null as well as those \/below\/
FileInputStream fstream = new FileInputStream(System.getProperty("user.dir")
+ "/src/com/projects/aoa/" + this.type + this.name + ".txt");
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String line;
int counter = 0;
while ((line = br.readLine()) != null) {
if (line.length() == 0){
break;
}
switch (counter) {
case 0:
this.hp = Integer.parseInt(line);
counter++;
break;
case 1:
this.mp = Integer.parseInt(line);
counter++;
break;
case 2:
this.def = Integer.parseInt(line);
counter++;
break;
case 3:
this.str = Integer.parseInt(line);
counter++;
break;
}
}
in.close();
} catch (Exception e) {
e.printStackTrace();
}
}
Game.java:
Helmet headBand = new Helmet("HeadBand");
Helmet bronzeHelmet = new Helmet("BronzeHelmet");
Items[] equips = {
headBand, bronzeHelmet
};
getAllStats(equips);
Equips.java:
package com.projects.aoa;
import static com.projects.aoa.Print.print;
import static com.projects.aoa.Print.println;
import java.io.*;
class Equips extends Items{
String name, type;
int hp, mp, str, def;
void printStats(){
println("[" + name + "]");
println("Type: " + type);
println("HP: " + hp);
println("MP: " + mp);
println("Def: " + def);
println("Str: " + str);
}
}
class Helmet extends Equips {
Helmet(String name){
this.name = name;
this.type = "h_";
}
}
你能向我们展示一些'Helmet'的代码吗?我怀疑'Helmet'类也有'name'参数,否则你只是忘了设置'name'。 – Bringer128