How do I implement a Linked List in Java?

class Link {
    public int data1;
    public double data2;
    public Link nextLink;

    //Link constructor
    public Link(int d1, double d2) {
	    data1 = d1;
	    data2 = d2;
    }

    //Print Link data
    public void printLink() {
	    System.out.print("{" + data1 + ", " + data2 + "} ");
    }
}

class LinkList {
    private Link first;

    //LinkList constructor
    public LinkList() {
	    first = null;
    }

    //Returns true if list is empty
    public boolean isEmpty() {
	    return first == null;
    }

    //Inserts a new Link at the first of the list
    public void insert(int d1, double d2) {
	    Link link = new Link(d1, d2);
	    link.nextLink = first;
	    first = link;
    }

    //Deletes the link at the first of the list
    public Link delete() {
	    Link temp = first;
	    first = first.nextLink;
	    return temp;
    }

    //Prints list data
    public void printList() {
	    Link currentLink = first;
	    System.out.print("List: ");
	    while(currentLink != null) {
		    currentLink.printLink();
		    currentLink = currentLink.nextLink;
	    }
	    System.out.println("");
    }
}

class LinkListTest {
    public static void main(String[] args) {
	    LinkList list = new LinkList();

	    list.insert(1, 1.01);
	    list.insert(2, 2.02);
	    list.insert(3, 3.03);
	    list.insert(4, 4.04);
	    list.insert(5, 5.05);

	    list.printList();

	    while(!list.isEmpty()) {
		    Link deletedLink = list.delete();
		    System.out.print("deleted: ");
		    deletedLink.printLink();
		    System.out.println("");
	    }
	    list.printList();
    }
}

list = new java.util.LinkedList()

public void insert(int d1, double d2) {
    Link link = new Link(d1, d2);

    if(first==null){
        link.nextLink = null;
        first = link;
        last=link;
    }
    else{
        last.nextLink=link;
        link.nextLink=null;
        last=link;
    }
}

//slightly improved code without using collection framework

package com.test;

public class TestClass {

    private static Link last;
    private static Link first;

    public static void main(String[] args) {

        //Inserting
        for(int i=0;i<5;i++){
            Link.insert(i+5);
        }
        Link.printList();

        //Deleting
        Link.deletefromFirst();
        Link.printList();
    }


    protected  static class Link {
        private int data;
        private Link nextlink;

        public Link(int d1) {
            this.data = d1;
        }

        public static void insert(int d1) {
            Link a = new Link(d1);
            a.nextlink = null;
            if (first != null) {
                last.nextlink = a;
                last = a;
            } else {
                first = a;
                last = a;
            }
            System.out.println("Inserted -:"+d1);
        }

        public static void deletefromFirst() {
            if(null!=first)
            {
                System.out.println("Deleting -:"+first.data);
                first = first.nextlink;
            }
            else{
                System.out.println("No elements in Linked List");
            }
        }

        public static void printList() {
            System.out.println("Elements in the list are");
            System.out.println("-------------------------");
            Link temp = first;
            while (temp != null) {
                System.out.println(temp.data);
                temp = temp.nextlink;
            }
        }
    }
}