来自另一个类中对象的引用变量

debugcn 发表于 Dev

vess

我有两个类，一个叫做“ Territory”的类，它使用以下变量构造一个对象：“ posX”和“ posY”，如下所示：

public Territory(int column, int row)
{
    posX = column;
    posY = row;
}

然后在另一个类“世界”中，我执行以下操作：

Territory territory1 = new Territory(0, 0);

但是，当我尝试从该对象引用某些变量时，即像这样：

System.out.println("Coordinates: " + territory1.posX);

我得到了错误：

cannot find symbol - variable territory1

有什么帮助吗？

编辑：

以下是完整的课程：

领土：

public class Territory
{
    public int posX;
    public int posY;
    public int armies;
    public String owner;

    public Territory(int column, int row)
    {
        posX = column;
        posY = row;
        armies = 0;
        owner = null;
    }
}

世界：

public class World
{
    public World()
    {
       Player player1 = new Player();
       Player player2 = new Player();

       Territory territory1 = new Territory(0, 0);
       Territory territory2 = new Territory(1, 0);
       Territory territory3 = new Territory(0, 1);
       Territory territory4 = new Territory(1, 1);     
    }

    public java.lang.String toString()
    {
        System.out.println(territory1.getposX);
    }
}

DnR

您的toString()方法无法识别“ territory1”，因为它是在其他方法中声明的

这应该工作

public class World
{
     Territory territory1, territory2, territory3, territory4;

    public World()
    {
       Player player1 = new Player();
       Player player2 = new Player();

       territory1 = new Territory(0, 0);
       territory2 = new Territory(1, 0);
       territory3 = new Territory(0, 1);
       territory4 = new Territory(1, 1);     
    }

    public toString()
    {
        if( territory1 != null)
            System.out.println(territory1.posX);
    }
}