如何将类的对象传递给另一个类的方法？

Question

How can I pass an object of a class to another class's method without interface or inheritance?

I need to pass an object of a class called Project to a method of class Developer . Can Java help me to do that?

Answer 1

Look on this sample code,

public class Project {

  public Project() {

   Developer developer = new Developer();
   developer.developerMethod(this);
  }
}

public class Developer {

public void developerMethod(Project project) {
 // do something
}
}

Answer 2

Yes, you can pass references to any reference type, no matter if it's a class, an interface, an array type, an enum, an annotation or if it's abstract , final or even strictfp :

public class Project {
}

public class Developer {
  public void myMethod(Project foo) {
    // do something with foo
  }
}

Answer 3

如果类Developer包含一个方法，该方法接受类型为Project的参数或Project继承的任何类型，包括Object ，那么您可以将Project类型的对象传递给Developer的方法

Answer 4

If you can choose the type of your method's parameter, it's quite simple:

class Project {
}

class Developer {
    public void complete(Project p) {
    }
}

class SoftwareHouse {
    public void perform() {
        Developer d = new Developer();
        Project p = new Project();
        d.complete(p);
    }
}

If the type of the argument is fixed and it isn't an interface or a super-class of Project you need to write an adapter class:

interface Assignment {
}

class Developer2 {
    public develop(Assignment a) {
    }
}

class ProjectAssignment implements Assignment {
    private Project p;

    public ProjectAssignment(Project p) {
        this.p = p;
    }
}

class SoftwareHouse2 {
    public void perform() {
        Developer2 d2 = new Developer2();
        Project p2 = new Project();
        Assignment a = new ProjectAssignment(p);
        d2.develop(a);
    }
}