Java (eclipse)：如何从同一项目中的另一个类调用 int 或 string？

Java (eclipse): How to call a int or string from another class in same project?

提问by Cristobal Ruiz

How can I use an int or string from another class in same project, for example, here we go with a class called Estadisticas:

如何在同一个项目中使用另一个类中的 int 或 string，例如，这里我们使用一个名为 的类Estadisticas：

public class Estadisticas {

    public void stats() {

        final String c1 = "Tu personaje";
        final int Nivel = 1;
        final int Salud = 50;
        final int Ataque = 2;
        final int Defensa = 1;

        final String c2 = "Primer monstruo - Rata rabiosa";
        final int SaludM1 = 2;
        final int AtaqueM1 = 1; 

    }
}

And I want to know how to call for example the String c1 to println like this:

我想知道如何像这样调用 String c1 到 println：

public class Start extends Estadisticas {
    public static void main() {
        System.out.println(String c1);
    }

}

After reading some example codes and people with similar problem, I tried with extends Estadisticaswith no luck, and I'm putting this code as I don't know how to call that string from another class in same project.

在阅读了一些示例代码和有类似问题的人之后，我尝试了但extends Estadisticas没有运气，我把这段代码放在了，因为我不知道如何从同一个项目中的另一个类调用该字符串。

Thanks in advance! Cristobal.

提前致谢！克里斯托瓦尔。

回答by ElRoBe

If you're trying to call a variable from another class, you have several options:

如果您尝试从另一个类调用变量，则有多种选择：

1) Declare the variable in the other class as static:

1) 将另一个类中的变量声明为静态：

public class Estadisticas {

  public static String c1 = "Tu personaje";
  ...
}

So in the other class, you can just call the string like so:

所以在另一个类中，你可以像这样调用字符串：

public class Start extends Estadisticas {
  public static void main() {
    System.out.println(Estadisticas.c1);
  }
}

2) Have the stats method return the string:

2) 让 stats 方法返回字符串：

public String stats() {

  final String c1 = "Tu personaje";
  final int Nivel = 1;
  final int Salud = 50;
  final int Ataque = 2;
  final int Defensa = 1;

  final String c2 = "Primer monstruo - Rata rabiosa";
  final int SaludM1 = 2;
  final int AtaqueM1 = 1; 

  return c1;
}

So you can do this:

所以你可以这样做：

public class Start extends Estadisticas {
  public static void main() {
    Estadisticas es = new Estadisticas();
    System.out.println(es.stats());
  }
}

3) Use an accessor method and instance variables:

3）使用访问器方法和实例变量：

public class Estadisticas {
  private String c1, c2;
  private int nivel, salud, ataque, defensa, saludM1, ataqueM1;

  public void stats() {
    c1 = "Tu personaje";
    nivel = 1;
    salud = 50;
    ataque = 2;
    defensa = 1;

    c2 = "Primer monstruo - Rata rabiosa";
    saludM1 = 2;
    ataqueM1 = 1; 
  }

  //accessor method
  public String getc1() {
    return c1;
  }
}

So in the other class you can use:

所以在另一个类中你可以使用：

public class Start extends Estadisticas {
  public static void main() {
    Estadisticas es = new Estadisticas();
    System.out.println(es.getc1());
  }
}

回答by TheLostMind

Like this :

像这样 ：

public class Estadisticas {
    final String c1 = "Tu personaje";
    final int Nivel = 1;
    final int Salud = 50;
    final int Ataque = 2;
    final int Defensa = 1;

    final String c2 = "Primer monstruo - Rata rabiosa";
    final int SaludM1 = 2;
    final int AtaqueM1 = 1; 

    public void stats() {

    }
}

public class Start extends Estadisticas {
    public static void main() {
     Estadisticas  es = new Estadisticas (); // create instance here
        System.out.println(es.c1);  // print using the instance


    }

}

回答by hurricane

this is public example. In java you need to use them as private for security.

这是公开的例子。在 java 中，您需要将它们用作私有以确保安全。

public class Estadisticas {
                public String c1 = "Tu personaje";
                public int Nivel = 1;
    }

This is calling from another class.

这是来自另一个类的调用。

    public class Start {
        public static void main() {

            Estadisticas.Nivel;
            Estadisticas.c1 ;
        }
  }