Java 不能使用另一个包中的公共方法 [英] Java can't use public method from one package in the another

问题描述

在同一个项目中，我有两个包，第一个包包含一个具有以下代码的类:

In the same project I have two packages, 1st package contains a class with this code:

package com.ginger;

public class SimplePrint 
{   

    public SimplePrint(){}

    public static void print(Object obj)
    {
        System.out.println(obj);
    }   
}

我想在另一个包的另一个类中使用 print() 方法，但在同一个项目中.

I would like use the method print() in another class in another package, but within the same project.

import com.ginger.*;

public class MainClass 
{

    public static void main(String[] args)
    {
        print("Some");
    }
}

但是编译器告诉我方法 print() 没有为第二个类定义.

But the compiler tells me that the method print() is undefined for the 2nd class.

同时，我可以在第二个类中创建对象 SimplePrint s = new SimplePrint().

In the same time, I am able to create the object SimplePrint s = new SimplePrint() in the 2nd class.

我是编程新手，如果我问的是简单的事情，请原谅.

I'm new to the programming, excuse me if i am asking about the simple thing.

推荐答案

有几种方法可以做到这一点:

There are a couple of ways to do this:

去掉print方法的static关键字，创建类的实例

Remove the static keyword of the method print and create an instance of the class

SimplePrint simplePrint = new SimplePrint();

就这样做

simplePrint.print("");

或者将上面的合并成一行:

Or combine the above into a single line:

new SimplePrint().print("");

静态

您保持 print 方法 static 并执行此操作

Static

You keep the print method static and just do this

SimplePrint.print("");

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