java - java中无法引用类

Question

class MyClass {
   int value;
}
public MyClass test(){
   MyClass mc;
   myMethod(mc, 100);
   if (mc!=null) {
      mc = mc.value;
      return mc;
   }
   return mc;
}
public int myMethod(MyClass mc, int a) {
   mc.value = a + 10;
   return mc;
}

我想把mc作为引用。如果 Objective-c 与此类似:

public MyClass test(){
   MyClass *mc;
   myMethod(&mc, 100);

}

请帮助我。任何答案都很感激。提前谢谢您。

Answer 1

在java中我们使用引用变量而不是指针。请参阅this和this

class MyClass 
{
   int value;

/*All methods have to belong to a class*/

public MyClass test()
{
 /*MyClass mc; you don't need to pass this to assign value the value will be 
 assigned to the data members of the object(reference variable) which calls the
 function*/       

MyClass mc = myMethod(100);
return mc;
}

public MyClass myMethod(int a) 
{
   value = a + 10;
   return this; //This 'this' will return the current object
}
}