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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		class A{
	public LinkedHashSet<Long> set = new HashSet<>();
 
	public long get(long index){
		return set.get(index);	
	}
 
	public void put(int value){
		set.put(value);
	}
 }
	}
}

Main.java:13: error: incompatible types: cannot infer type arguments for HashSet<>
	public LinkedHashSet<Long> set = new HashSet<>();
	                                            ^
    reason: no instance(s) of type variable(s) E exist so that HashSet<E> conforms to LinkedHashSet<Long>
  where E is a type-variable:
    E extends Object declared in class HashSet
Main.java:16: error: cannot find symbol
		return set.get(index);	
		          ^
  symbol:   method get(long)
  location: variable set of type LinkedHashSet<Long>
Main.java:20: error: cannot find symbol
		set.put(value);
		   ^
  symbol:   method put(int)
  location: variable set of type LinkedHashSet<Long>
3 errors

Standard output is empty