LinkedHashSet method in Java

* create
```
import java.util. * ;

public class Main {
    public static void main(String args[]){
        LinkedHashSet<String> s = new LinkedHashSet(); // create a default LinkedHashSet
        LinkedHashSet<String> s1 = new LinkedHashSet(s); // init with collection s
        LinkedHashSet<String> s2 = new LinkedHashSet(500); // int with the capacity
        LinkedHashSet<String> s3 = new LinkedHashSet(1000, 0.5f); // init with capacity and the load factor. When the number of elements exceeds the capacity multiplied with the load factor then expanding the capacity of the LinkedHashSet.

        s3.add("a");
        s3.add("c");
        s3.add("b");
        Iterator<String> it = s3.iterator();
        while(it.hasNext()) {
            System.out.println(it.next());
        }
    }
}
```
* iterator
```
import java.util. * ;

public class Main {
    public static void main(String args[]){
        LinkedHashSet<String> s = new LinkedHashSet(); 
        s.add("a");
        s.add("c");
        s.add("b");
        
        Iterator<String> it = s.iterator();
        while(it.hasNext()) {
            System.out.print(it.next()+",");
        }
        System.out.println("");
        for(String str: s) {
            System.out.print(str+",");
        }
        System.out.println("");
    }
}
```
* add
```
import java.util. * ;

public class Main {
    public static void main(String args[]){
        LinkedHashSet<String> s = new LinkedHashSet(); 
        s.add("a");
        s.add("c");
        s.add("b");
        
        System.out.println(s);
    }
}
```
* change (N/A)
* query
```
import java.util. * ;

public class Main {
    public static void main(String args[]){
        LinkedHashSet<String> s = new LinkedHashSet(); 
        s.add("a");
        s.add("c");
        s.add("b");
        
        System.out.println(s.isEmpty());
        System.out.println(s.size());
        System.out.println(s.contains("c"));
    }
}
```
* delete
```
import java.util. * ;

public class Main {
    public static void main(String args[]){
        LinkedHashSet<String> s = new LinkedHashSet(); 
        s.add("a");
        s.add("c");
        s.add("b");
        
        s.remove("b");
        s.remove("d");
        s.clear();
        System.out.println(s);
    }
}
```
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