通过变量声明包类 - java

I have created 2 packages with classes like

我创建了2个类包的类

pakage1.class.files
  |- ClassA;
  |- ClassB;

pakage2.class.files
  |- ClassC;

But i want to call the code as follows

但我想调用代码如下

public class ClassC
{
    public void method1()
    {
        pakage1.class.files.ClassA var1 = new pakage1.class.files.ClassA();
    }
}

But i want to pass "pakage1.class.files.ClassA" as variable like

但我想传递“pakage1.class.files.ClassA”作为变量

public class ClassC
{
    public string CL1 = "pakage1.class.files.ClassA";

    public void method1()
    {
        CL1 var1 = new CL1();
    }
}

Kindly Help me...

请帮助我......

2 个解决方案

#1

No, you can't do this. Variable types have to be known at compile time.

不，你不能这样做。必须在编译时知道变量类型。

You could use:

你可以使用：

Class<?> clazz = Class.forName(className);
Object object = clazz.newInstance();

... but then of course you'd have to use reflection to get at any of the members. You won't have a variable of that type.

...但当然你必须使用反射来获得任何成员。你不会有这种类型的变量。

EDIT: Of course you don't need to have the fully-qualified name everywhere in your code. You can use import statements for that:

编辑：当然，您不需要在代码中的任何位置拥有完全限定的名称。您可以使用import语句：

// Please don't include "class" as part of your package name...
import package1.class.files.ClassA;

public class ClassC {
    public void method1() {
        ClassA var1 = new ClassA();
    }
}

... which isn't really the same thing, of course... but it may help you anyway.

......当然，这不是一回事......但无论如何它可能对你有所帮助。

#2

CL1 var1 = new CL1();

this is an error in java. CL1 is the identifier for a variable, not a data type hence you cannot use CL1 as a type when creating variables.

这是java中的错误。 CL1是变量的标识符，而不是数据类型，因此在创建变量时不能将CL1用作类型。

#1