Java Fundamentals-Interface 2

 1  package   Jiekou;  2   Public  interface   InterfaceA1 { Span style= "color: #008080;" >4  /*   (1) write an interface: Interfacea, containing only one method int Method (int n);  5   (4) write Test Class E, In the main method of test class E, use the form of an interface callback to test the implementation of  6   interface class.  */ 7   method (int   8 } 

1  PackageJiekou;2 3  Public classClassAImplementsInterfaceA1 {4     /*5 * (2) Write a class: ClassA to Implement Interface Interfacea,6 * When implementing an int method (int n) interface approach, a calculation of 1 to n is required;7      */8 @Override9      Public intMethodintN) {Ten         intSum=0; One          for(inti=0;i<=n;i++) A         { -sum+=i; -         } the         returnsum; -     } -  -}

1  PackageJiekou;2 3  Public classClassBImplementsInterfaceA1 {4     /*(3) write another class: ClassB to Implement Interface Interfacea,5 * When implementing the int method (int n) interface approach, it is required to calculate the factorial of n (n!);6      */7 @Override8      Public intMethodintN) {9         Ten         intS=1; One          for(inti=1;i<=n;i++) A         { -s=s*i; -              the         } -         returns; -     } -  +}

1  PackageJiekou;2 3  Public classE1 {4 5      Public Static voidMain (string[] args) {6         //TODO Auto-generated method stubs7 8ClassA a=NewClassA ();9System.out.println ("1-5 of the And for:" +a.method (5));TenClassB b=NewClassB (); OneSystem.out.println (The factorial of "5" is: "+b.method (5)); A     } -  -}

Java Fundamentals-Interface 2