[Java / Swift] Comparison of Java Interface and Swift Protocol

public class Main {
    
    interface sampleInterface{
        String sampleFunction(String a, String b);
    }
    
    
    public static void main(String[] args) throws Exception {
    
    /*When implementing an interface in a class, write implements*/    
    class A implements sampleInterface{
        public String sampleFunction(String a, String b){
            return "「" + a + ""When"" + b + "Is the argument of sampleFunction defined in classA";
        }
    }
    
    class B implements sampleInterface{
        public String sampleFunction(String a, String b){
            return "「" + a + ""When"" + b + "Is the argument of sampleFunction defined in classB";
        }
    }
    
    A a = new A();
    B b = new B();
    
    System.out.println(a.sampleFunction("c","d"));
    System.out.println(b.sampleFunction("e","f"));

    }
}

"C" and "d" are the arguments of sampleFunction defined in classA
"E" and "f" are the arguments of sampleFunction defined in classB

//protocol
protocol SampleProtocol{
    func sampleFunction(_ a:String, _ b:String) -> String
}

// class A
class A:SampleProtocol{
    func sampleFunction(_ a:String, _ b:String) -> String{
        return "「\(a)"When"\(b)Is the argument of sampleFunction defined in classA"
    }
}


// class B
class B:SampleProtocol{
    func sampleFunction(_ a:String, _ b:String) -> String{
        return "「\(a)"When"\(b)Is the argument of sampleFunction defined in classB"
    }
}


var a = A()
var b = B()

print(a.sampleFunction("c","d"))
print(b.sampleFunction("e","f"))

"C" and "d" are the arguments of sampleFunction defined in classA
"E" and "f" are the arguments of sampleFunction defined in classB

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