使用另一个类的方法在主？ [英] Using methods from another class in the main?

问题描述

好吧，所以我没有搜索这个问题，一个体面的结果出现了。所有的人似乎有不同的情况，但解决方案是不同的每一个，所以我有点困惑。

Okay so I did search this question and a decent amount of results showed up. All of them seemed to have pretty different scenarios though and the solutions were different for each one so I'm a bit confused.

基本上，我有一个Driver类，它运行我的程序并包含main方法。我有一个第二类，有几个方法编辑一方（如游戏中的字符的党）。我想做的是这个（主要方法的一部分）

Basically, I have a Driver class that runs my program and contains the main method. I have a second class that has a few methods for editing a party (like party of characters in a game). What I wanted to do was this (part of main method)

System.out.println("Are you <ready> for your next battle? Or do you want to <edit> your party?");
Scanner readyScanner = new Scanner(System.in);
String readyString = readyScanner.next();
while(!readyString.equals("ready") && !readyString.equals("edit")) {
    System.out.println("Error: Please input <ready> if you are ready for your next battle, or <edit> to change your party.");
    readyScanner = new Scanner(System.in);
    readyString = readyScanner.next();
}
if(readyString.equals("edit")) {
    displayEditParty(playerParty, tempEnemy);
}

很多这只是一些背景代码，问题出在

A lot of this is just some background code, the problem lies with

displayEditParty(playerParty, tempEnemy);

我收到错误

Driver.java:283: cannot find symbol
symbol  : method  
displayEditParty(java.util.ArrayList<Character>,java.util.ArrayList<Character>)
location: class Driver
displayEditParty(playerParty, tempEnemy);

那么，我如何从另一个类中调用这个方法？在我的代码中，我使用其他类的方法几次，我有点困惑，因为这不工作。

So, how could I call this method from another class in my main? In my code I use methods from other classes a few times, I'm a bit confused as to this one doesn't work.

推荐答案

你应该使 displayEditParty 函数public static然后你可以使用它在其他类中 className.displayEditParty（？，？）; code>

You should make displayEditParty function public static and then you can use it in other class by className.displayEditParty(?,?);

类的方法只能由该类的对象访问。请检查下面的代码：

Methods of class can be accessible by that class's object only. Check below code:

class A{

    void methodA(){
        //Some logic
    }

    public static void methodB(){
        //Some logic
    }
}

public static void main(String args[]){

    A obj = new A();
    obj.methodA(); // You can use methodA using Object only.

    A.methodB();  // Whereas static method can be accessed by object as well as 
    obj.methodB(); // class name.
}

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