Java中另一个接口中的接口数据

Question

I have two interfaces Interface1 and Interface2 as below:

public interface Interface1 {
  int x = 10 ;
}

public interface Interface2 {
  int y = 20
}

I want to call the Interface2 value of y in Interface1 . Is it possible? if yes can you tell me the way.

Answer 1

Fields in interfaces are implicitly public static and final .

Just reference Interface2.y .

Answer 2

I think you're asking how to add a y to Interface1 based on y from Interface2 . That might look like,

public interface Interface1 {
    int x = 10 ;
    int y = Interface2.y;
}

Alternatively, you could extend Interface2 like

public interface Interface1 extends Interface2 {
    int x = 10;
}

Answer 3

You can also nest interfaces like:

public interface A {
    int a = 0;
    interface B{
        int b = 0;
        int c = a;
    }  
}

Answer 4

Or simply do in this way,

public interface Interface2{
  int Y = 20
 }

public interface Interface1 extends Interface2 {
  int X = 10 ;
//The member 'Y' will be available here, you can simply make use of it you don't need to call like Interface2.Y.
 }

Answer 5

public interface Interface1 extends interface2 {

int x = 10;

}

public interface Interface2{

 int y = 20

}

public class temp {

public static void main(String[] args) 
{
    System.out.println(interface1.x);

}

}