Explanation of Solution
Method definition for “removeMin()”:
The method definition for “removeMin()” is given below:
/* Method definition for "removeMin()" */
String removeMin()
{
/* If the list head is null, then */
if (first == null)
//Returns null
return null;
/* Set minimum string to "first" node */
Node minimumString = first;
/* Set minimum string predecessor to list head*/
Node minimumPred = first;
/* Set reference node to next node of list head */
Node refNode = first.next;
/* Set the reference of predecessor node */
Node refPred = first;
/* If the reference node "refNode" is not "null", then */
while (refNode != null)
{
/* Check condition */
if (refNode.value.compareTo(minimumString.value) < 0)
{
/* Assign minimum string to "refNode" */
minimumString = refNode;
/* Set minimum predecessor to reference of predecessor */
minimumPred = refPred;
}
/* Set "refPred" to "refNode*/
refPred = refNode;
/* Set "refNode" to next reference node */
refNode = refNode.next;
}
// Compute If the first node is the minimum or not
String resultantString = minimumString.value;
/* If the minimum string is list head, then */
if (minimumString == first)
{
//Remove the first string
first = first.next;
/* If the list head is "null", then */
if (first == null)
/* Set "last" to "null" */
last = null;
}
//Otherwise
else
{
//Remove an element with a predecessor
minimumPred.next = minimumString.next;
// If the last item removed, then
if (minimumPred.next == null)
/* Assign "last" to "minimumPred" */
last = minimumPred;
}
/* Finally returns the resultant string elements */
return resultantString;
}
Explanation:
The above method definition is used to remove a minimum element from a list.
- If the list head is null, then returns null.
- Set minimum string and minimum predecessor to “first” node.
- Set reference node to next node of list head and also set the reference of predecessor node.
- Performs “while” loop. This loop will perform up to the “refNode” becomes “null”.
- Check condition using “if” loop.
- If the given condition is true, then assign minimum string to “refNode”.
- Set minimum predecessor to reference of predecessor.
- Set “refPred” to “refNode”.
- Set “refNode” to next reference node.
- Check condition using “if” loop.
- Compute if the first node is minimum or not.
- If the minimum string is list head, then
- Remove the first string.
- If the list head is “null”, then set “last” to “null”.
- Otherwise,
- Remove an element with a predecessor.
- If the last item removed, then assign “last” to “minimumPred”.
- Finally returns the resultant string elements.
Complete code:
The complete executable code for remove a minimum string element from a linked list is given below:
//Define "LinkedList1" class
class LinkedList1
{
/** The code for this part is same as the textbook of "LinkedList1" class */
/* Method definition for "removeMin()" */
String removeMin()
{
/* If the list head is null, then */
if (first == null)
//Returns null
return null;
/* Set minimum string to "first" node */
Node minimumString = first;
/* Set minimum string predecessor to list head*/
Node minimumPred = first;
/* Set reference node to next node of list head */
Node refNode = first...
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Chapter 20 Solutions
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EBK JAVA PROGRAMMINGComputer ScienceISBN:9781337671385Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENT