write a program to implement the above interface using Lambda Expression to accept “ Hello World” and print it 10 times. write a program to implement the above interface using Inner Class to accept “ Hello World” and print it 10 times

write a program to implement the above interface using Lambda Expression to accept “ Hello World” and print it 10 times. 

 write a program to implement the above interface using Inner Class to accept “ Hello World” and print it 10 times

This is my code 

interface interf1 { 

publicvoidrepeat(Strings1); 

}

 public class Main { 

 public static void main(String[] args) { 

   interf1 obj = (s1)-> { //using lambda expression 

     for(int i=0;i<10;i++) {

             System.out.println(s1);

     }         

     };

          obj.repeat("Hello World");

 }

}

public class Assignment { 

 public static void main(String[] args) {

  interf1 obj = new interf1() {  //inner class

            public void repeat(String s1){

           for(int i=0;i<10;i++){

             System.out.println(s1);             

            }

         }        

     };

     obj.repeat("Hello World");  //function call

 }

}

But i keep getting this error 

Exception in thread "main" java.lang.NoClassDefFoundError: interf1at Main.main(Main.java:17)Caused by: java.lang.ClassNotFoundException: interf1at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)... 1 more