Startpunkten

Java_Database/List.java

@@ -0,0 +1,70 @@
+/**
+*  This class contains the linked list.
+*  It also contains the constructor, wich
+*  generates a new list called myList
+*  
+*       @author Christian Ohlsson, Karlstad university 1999
+*       @version 1.0.0
+*/
+public class  List { 
+  Element first, last;  
+ 
+/**
+*  This is the constructor of the list.
+*  What it basically do is to set
+*  the two Elements constructed before
+*  to null.
+*/
+  public List() { first = last = null; } 
+ 
+/**
+*  This function returns the first Element 
+*  in the list.
+*/
+  public Element first() { return first; } 
+ 
+/**
+*  This function returns the last Element 
+*  in the list.
+*/
+  public Element last() { return last; } 
+ 
+/**
+*  If the first element in the List is null, 
+*  it returns true, that is, there's no Elements 
+*  in the List.
+*/
+  public boolean empty() { return first==null; } 
+ 
+/**
+*  This function recives a number and it traverses
+*  though the List until that number is reached
+*  and then returns the Element on that location
+*/
+  public Element getElement(int number) {
+    Element e = first;
+    int antal = 0;
+    while (antal<number) { 
+      antal++; 
+      e = e.suc; 
+    } 
+    return e; 
+  }     
+ 
+/**
+*  This function initialize a number to zero
+*  and the traverses though the List until
+*  it reaches the end and than returns
+*  the number of elements.
+*/
+  public int cardinal() { 
+    int antal = 0; 
+    Element e = first; 
+    while (e!=null) { 
+      antal++; 
+      e = e.suc; 
+    } 
+    return antal; 
+  } 
+} 
+