转换为实例方法

public class MyClass {
     ClassA classA = new ClassA();
     ClassB classB = new ClassB();

     static public void greatMethod(ClassA classA, ClassB classB){
         System.out.println("classA = " + classA);
         System.out.println("classB = " + classB);
     }
     public void myMethod(){
         MyClass.greatMethod(classA, classB);
     }
}

public class MyClass {
    ClassA classA = new ClassA();
    ClassB classB = new ClassB();

    public void myMethod(){
        classB.greatMethod(classA);
    }
}

public class ClassB {
    public void greatMethod(ClassA classA) {
        System.out.println("classA = " + classA);
        System.out.println("classB = " + this);
    }
}