Sort ArrayList alphabetically java without Collections

To sort the ArrayList, you need to simply call the Collections. sort[] method passing the ArrayList object populated with country names. This method will sort the elements [country names] of the ArrayList using natural ordering [alphabetically in ascending order].

How do you sort an ArrayList element?

Approach: An ArrayList can be Sorted by using the sort[] method of the Collections Class in Java. This sort[] method takes the collection to be sorted as the parameter and returns a Collection sorted in the Ascending Order by default.

How do you sort a list alphabetically in Java?

We can use the following methods to sort the list:

1. Using stream. sorted[] method.
2. Using Comparator. reverseOrder[] method.
3. Using Comparator. naturalOrder[] method.
4. Using Collections. reverseOrder[] method.
5. Using Collections. sort[] method.

Can you sort an ArrayList?

An ArrayList can be sorted by using the sort[] method of the Collections class in Java. It accepts an object of ArrayList as a parameter to be sort and returns an ArrayList sorted in the ascending order according to the natural ordering of its elements.

How do you sort an array of objects alphabetically in Java?

Just like numeric arrays, you can also sort string array using the sort function. When you pass the string array, the array is sorted in ascending alphabetical order. To sort the array in descending alphabetical order, you should provide the Collections interface method reverseOrder [] as the second argument.

How do I change the order of an ArrayList in Java?

How to move specific item in array list to the first item in Java

1. Get the position [index] of the item using the indexOf[] method of the ArrayList class.
2. Remove it using the remove[] method of the ArrayList class.
3. Finally, add it to the index 0 using the add[] method of the ArrayList class.

How do you sort arrays in Java?

Take a look at this example:

1. import java. util. Arrays;
2. public class Sorting {
3. public static void main [String [] args] {
4. int [] array = {45,12,85,32,89,39,69,44,42,1,6,8};
5. Arrays. sort[array];
6. System. out. println[“Completely Sorted: ” + Arrays.
7. int index = Arrays. binarySearch[array, 42];
8. System. out.

How do I sort a list alphabetically?

Sort a list alphabetically in Word

1. Select the list you want to sort.
2. Go to Home > Sort.
3. Set Sort by to Paragraphs and Text.
4. Choose Ascending [A to Z] or Descending [Z to A].
5. Select OK.

Is list sorted in Java?

A list can be either sorted in the natural order or in a custom order. We’ll cover both these cases using Comparable and Comparator interfaces.

How do you sort a list in descending order in Java 8?

3. Using Java 8

1. Obtain a stream consisting of all elements of the list.
2. Sort the stream in reverse order using Stream. sorted[] method by passing Comparator. reverseOrder[] to it that imposes the reverse of the natural ordering.
3. Collect all elements of sorted stream in a list using Stream. collect[] with Collectors.

Does ArrayList maintain insertion order?

Yes, ArrayList is an ordered collection and it maintains the insertion order.

How do you flip an ArrayList?

To reverse an ArrayList in java, one can use Collections class reverse method i.e Collections. reverse[] method. Collections reverse method reverses the element of ArrayList in linear time i.e time complexity is O[n]. Collections reverse method accepts a List type as an argument.

How do I sort a List in comparator?

There are several ways to implement Comparators in Java:

1. Pass Comparator as argument to sort[] method. Comparators, if passed to a sort method [such as Collections.
2. Implement Comparator in a separate class.
3. Pass Comparator to List.sort[] method.

How do you sort an ArrayList of objects alphabetically in Java 8?

To sort the ArrayList, you need to simply call the Collections. sort[] method passing the ArrayList object populated with country names. This method will sort the elements [country names] of the ArrayList using natural ordering [alphabetically in ascending order].

How do you check if an array is in alphabetical order?

A simple approach: Store the string to a character array and sort the array. If the characters in the sorted array are in the same order as the string then print ‘In alphabetical order ‘.

How do you sort a character array in Java without using the sort method?

Sorting string without using string Methods?

1. package com.Instanceofjava;
2. public class SortString {
3. String original = “edcba”;
4. int j=0;
5. char temp=0;
6. char[] chars = original.toCharArray[];
7. for [int i = 0; i unit override this.Sort : unit -> unit Public Overridable Sub Sort []

   The following code example shows how to sort the values in an ArrayList.

   using namespace System; using namespace System::Collections; void PrintValues[ IEnumerable^ myList ]; int main[] { // Creates and initializes a new ArrayList. ArrayList^ myAL = gcnew ArrayList; myAL->Add[ "The" ]; myAL->Add[ "quick" ]; myAL->Add[ "brown" ]; myAL->Add[ "fox" ]; myAL->Add[ "jumps" ]; myAL->Add[ "over" ]; myAL->Add[ "the" ]; myAL->Add[ "lazy" ]; myAL->Add[ "dog" ]; // Displays the values of the ArrayList. Console::WriteLine[ "The ArrayList initially contains the following values:" ]; PrintValues[ myAL ]; // Sorts the values of the ArrayList. myAL->Sort[]; // Displays the values of the ArrayList. Console::WriteLine[ "After sorting:" ]; PrintValues[ myAL ]; } void PrintValues[ IEnumerable^ myList ] { IEnumerator^ myEnum = myList->GetEnumerator[]; while [ myEnum->MoveNext[] ] { Object^ obj = safe_cast[myEnum->Current]; Console::WriteLine[ " {0}", obj ]; } Console::WriteLine[]; } /* This code produces the following output. The ArrayList initially contains the following values: The quick brown fox jumps over the lazy dog After sorting: brown dog fox jumps lazy over quick the The */ using System; using System.Collections; public class SamplesArrayList1 { public static void Main[] { // Creates and initializes a new ArrayList. ArrayList myAL = new ArrayList[]; myAL.Add["The"]; myAL.Add["quick"]; myAL.Add["brown"]; myAL.Add["fox"]; myAL.Add["jumps"]; myAL.Add["over"]; myAL.Add["the"]; myAL.Add["lazy"]; myAL.Add["dog"]; // Displays the values of the ArrayList. Console.WriteLine["The ArrayList initially contains the following values:"]; PrintValues[myAL]; // Sorts the values of the ArrayList. myAL.Sort[]; // Displays the values of the ArrayList. Console.WriteLine["After sorting:"]; PrintValues[myAL]; } public static void PrintValues[IEnumerable myList] { foreach [Object obj in myList] Console.WriteLine[" {0}", obj]; Console.WriteLine[]; } } /* This code produces the following output. The ArrayList initially contains the following values: The quick brown fox jumps over the lazy dog After sorting: brown dog fox jumps lazy over quick the The */ Imports System.Collections Public Class SamplesArrayList Public Shared Sub Main[] ' Creates and initializes a new ArrayList. Dim myAL As New ArrayList[] myAL.Add["The"] myAL.Add["quick"] myAL.Add["brown"] myAL.Add["fox"] myAL.Add["jumps"] myAL.Add["over"] myAL.Add["the"] myAL.Add["lazy"] myAL.Add["dog"] ' Displays the values of the ArrayList. Console.WriteLine["The ArrayList initially contains the following values:"] PrintValues[myAL] ' Sorts the values of the ArrayList. myAL.Sort[] ' Displays the values of the ArrayList. Console.WriteLine["After sorting:"] PrintValues[myAL] End Sub Public Shared Sub PrintValues[myList As IEnumerable] Dim obj As [Object] For Each obj In myList Console.WriteLine[" {0}", obj] Next obj Console.WriteLine[] End Sub End Class ' This code produces the following output. ' ' The ArrayList initially contains the following values: ' The ' quick ' brown ' fox ' jumps ' over ' the ' lazy ' dog ' ' After sorting: ' brown ' dog ' fox ' jumps ' lazy ' over ' quick ' the ' The

   Remarks

   This method uses Array.Sort, which uses the QuickSort algorithm. The QuickSort algorithm is a comparison sort [also called an unstable sort], which means that a "less than or equal to" comparison operation determines which of two elements should occur first in the final sorted list. However, if two elements are equal, their original order might not be preserved. In contrast, a stable sort preserves the order of elements that are equal. To perform a stable sort, you must implement a custom IComparer interface to use with the other overloads of this method.

   On average, this method is an O[n log n] operation, where n is Count; in the worst case it is an O[n^2] operation.

   See also

   • Performing Culture-Insensitive String Operations in Collections

   Applies to

   Sort[IComparer]

   public: virtual void Sort[System::Collections::IComparer ^ comparer]; public virtual void Sort [System.Collections.IComparer comparer]; public virtual void Sort [System.Collections.IComparer? comparer]; abstract member Sort : System.Collections.IComparer -> unit override this.Sort : System.Collections.IComparer -> unit Public Overridable Sub Sort [comparer As IComparer]

   The following code example shows how to sort the values in an ArrayList using the default comparer and a custom comparer that reverses the sort order.

   using namespace System; using namespace System::Collections; void PrintIndexAndValues[ IEnumerable^ myList ]; ref class myReverserClass: public IComparer { private: // Calls CaseInsensitiveComparer.Compare with the parameters reversed. virtual int Compare[ Object^ x, Object^ y ] sealed = IComparer::Compare { return [[gcnew CaseInsensitiveComparer]->Compare[ y, x ]]; } }; int main[] { // Creates and initializes a new ArrayList. ArrayList^ myAL = gcnew ArrayList; myAL->Add[ "The" ]; myAL->Add[ "quick" ]; myAL->Add[ "brown" ]; myAL->Add[ "fox" ]; myAL->Add[ "jumps" ]; myAL->Add[ "over" ]; myAL->Add[ "the" ]; myAL->Add[ "lazy" ]; myAL->Add[ "dog" ]; // Displays the values of the ArrayList. Console::WriteLine[ "The ArrayList initially contains the following values:" ]; PrintIndexAndValues[ myAL ]; // Sorts the values of the ArrayList using the default comparer. myAL->Sort[]; Console::WriteLine[ "After sorting with the default comparer:" ]; PrintIndexAndValues[ myAL ]; // Sorts the values of the ArrayList using the reverse case-insensitive comparer. IComparer^ myComparer = gcnew myReverserClass; myAL->Sort[ myComparer ]; Console::WriteLine[ "After sorting with the reverse case-insensitive comparer:" ]; PrintIndexAndValues[ myAL ]; } void PrintIndexAndValues[ IEnumerable^ myList ] { int i = 0; IEnumerator^ myEnum = myList->GetEnumerator[]; while [ myEnum->MoveNext[] ] { Object^ obj = safe_cast[myEnum->Current]; Console::WriteLine[ "\t[{0}]:\t{1}", i++, obj ]; } Console::WriteLine[]; } /* This code produces the following output. The ArrayList initially contains the following values: [0]: The [1]: quick [2]: brown [3]: fox [4]: jumps [5]: over [6]: the [7]: lazy [8]: dog After sorting with the default comparer: [0]: brown [1]: dog [2]: fox [3]: jumps [4]: lazy [5]: over [6]: quick [7]: the [8]: The After sorting with the reverse case-insensitive comparer: [0]: the [1]: The [2]: quick [3]: over [4]: lazy [5]: jumps [6]: fox [7]: dog [8]: brown */ using System; using System.Collections; public class SamplesArrayList2 { public class myReverserClass : IComparer { // Calls CaseInsensitiveComparer.Compare with the parameters reversed. int IComparer.Compare[Object x, Object y] { return [[new CaseInsensitiveComparer[]].Compare[y, x]]; } } public static void Main[] { // Creates and initializes a new ArrayList. ArrayList myAL = new ArrayList[]; myAL.Add["The"]; myAL.Add["quick"]; myAL.Add["brown"]; myAL.Add["fox"]; myAL.Add["jumps"]; myAL.Add["over"]; myAL.Add["the"]; myAL.Add["lazy"]; myAL.Add["dog"]; // Displays the values of the ArrayList. Console.WriteLine["The ArrayList initially contains the following values:"]; PrintIndexAndValues[myAL]; // Sorts the values of the ArrayList using the default comparer. myAL.Sort[]; Console.WriteLine["After sorting with the default comparer:"]; PrintIndexAndValues[myAL]; // Sorts the values of the ArrayList using the reverse case-insensitive comparer. IComparer myComparer = new myReverserClass[]; myAL.Sort[myComparer]; Console.WriteLine["After sorting with the reverse case-insensitive comparer:"]; PrintIndexAndValues[myAL]; } public static void PrintIndexAndValues[IEnumerable myList] { int i = 0; foreach [Object obj in myList] Console.WriteLine["\t[{0}]:\t{1}", i++, obj]; Console.WriteLine[]; } } /* This code produces the following output. The ArrayList initially contains the following values: [0]: The [1]: quick [2]: brown [3]: fox [4]: jumps [5]: over [6]: the [7]: lazy [8]: dog After sorting with the default comparer: [0]: brown [1]: dog [2]: fox [3]: jumps [4]: lazy [5]: over [6]: quick [7]: the [8]: The After sorting with the reverse case-insensitive comparer: [0]: the [1]: The [2]: quick [3]: over [4]: lazy [5]: jumps [6]: fox [7]: dog [8]: brown */ Imports System.Collections Public Class SamplesArrayList Public Class myReverserClass Implements IComparer ' Calls CaseInsensitiveComparer.Compare with the parameters reversed. Public Function Compare[ ByVal x As Object, ByVal y As Object] As Integer _ Implements IComparer.Compare Return New CaseInsensitiveComparer[].Compare[y, x] End Function 'IComparer.Compare End Class Public Shared Sub Main[] ' Creates and initializes a new ArrayList. Dim myAL As New ArrayList[] myAL.Add["The"] myAL.Add["quick"] myAL.Add["brown"] myAL.Add["fox"] myAL.Add["jumps"] myAL.Add["over"] myAL.Add["the"] myAL.Add["lazy"] myAL.Add["dog"] ' Displays the values of the ArrayList. Console.WriteLine["The ArrayList initially contains the following values:"] PrintIndexAndValues[myAL] ' Sorts the values of the ArrayList using the default comparer. myAL.Sort[] Console.WriteLine["After sorting with the default comparer:"] PrintIndexAndValues[myAL] ' Sorts the values of the ArrayList using the reverse case-insensitive comparer. Dim myComparer = New myReverserClass[] myAL.Sort[myComparer] Console.WriteLine["After sorting with the reverse case-insensitive comparer:"] PrintIndexAndValues[myAL] End Sub Public Shared Sub PrintIndexAndValues[myList As IEnumerable] Dim i As Integer = 0 Dim obj As [Object] For Each obj In myList Console.WriteLine[vbTab + "[{0}]:" + vbTab + "{1}", i, obj] i = i + 1 Next obj Console.WriteLine[] End Sub End Class 'This code produces the following output. 'The ArrayList initially contains the following values: ' [0]: The ' [1]: quick ' [2]: brown ' [3]: fox ' [4]: jumps ' [5]: over ' [6]: the ' [7]: lazy ' [8]: dog ' 'After sorting with the default comparer: ' [0]: brown ' [1]: dog ' [2]: fox ' [3]: jumps ' [4]: lazy ' [5]: over ' [6]: quick ' [7]: the ' [8]: The ' 'After sorting with the reverse case-insensitive comparer: ' [0]: the ' [1]: The ' [2]: quick ' [3]: over ' [4]: lazy ' [5]: jumps ' [6]: fox ' [7]: dog ' [8]: brown

   Remarks

   Use the Sort method to sort a list of objects with a custom comparer that implements the IComparer interface. If you pass null for comparer, this method uses the IComparable implementation of each element. In this case, you must make sure that the objects contained in the list implement the IComparer interface or an exception will occur.

   In addition, using the IComparable implementation means the list performs a comparison sort [also called an unstable sort]; that is, if two elements are equal, their order might not be preserved. In contrast, a stable sort preserves the order of elements that are equal. To perform a stable sort, you must implement a custom IComparer interface.

   On average, this method is an O[n log n] operation, where n is Count; in the worst case it is an O[n^2] operation.

   See also

   • Performing Culture-Insensitive String Operations in Collections

   Applies to

   Sort[Int32, Int32, IComparer]

   public: virtual void Sort[int index, int count, System::Collections::IComparer ^ comparer]; public virtual void Sort [int index, int count, System.Collections.IComparer comparer]; public virtual void Sort [int index, int count, System.Collections.IComparer? comparer]; abstract member Sort : int * int * System.Collections.IComparer -> unit override this.Sort : int * int * System.Collections.IComparer -> unit Public Overridable Sub Sort [index As Integer, count As Integer, comparer As IComparer]

   The following code example shows how to sort the values in a range of elements in an ArrayList using the default comparer and a custom comparer that reverses the sort order.

   using namespace System; using namespace System::Collections; void PrintIndexAndValues[ IEnumerable^ myList ]; ref class myReverserClass: public IComparer { private: // Calls CaseInsensitiveComparer.Compare with the parameters reversed. virtual int Compare[ Object^ x, Object^ y ] = IComparer::Compare { return [[gcnew CaseInsensitiveComparer]->Compare[ y, x ]]; } }; int main[] { // Creates and initializes a new ArrayList. ArrayList^ myAL = gcnew ArrayList; myAL->Add[ "The" ]; myAL->Add[ "QUICK" ]; myAL->Add[ "BROWN" ]; myAL->Add[ "FOX" ]; myAL->Add[ "jumps" ]; myAL->Add[ "over" ]; myAL->Add[ "the" ]; myAL->Add[ "lazy" ]; myAL->Add[ "dog" ]; // Displays the values of the ArrayList. Console::WriteLine[ "The ArrayList initially contains the following values:" ]; PrintIndexAndValues[ myAL ]; // Sorts the values of the ArrayList using the default comparer. myAL->Sort[ 1, 3, nullptr ]; Console::WriteLine[ "After sorting from index 1 to index 3 with the default comparer:" ]; PrintIndexAndValues[ myAL ]; // Sorts the values of the ArrayList using the reverse case-insensitive comparer. IComparer^ myComparer = gcnew myReverserClass; myAL->Sort[ 1, 3, myComparer ]; Console::WriteLine[ "After sorting from index 1 to index 3 with the reverse case-insensitive comparer:" ]; PrintIndexAndValues[ myAL ]; } void PrintIndexAndValues[ IEnumerable^ myList ] { int i = 0; IEnumerator^ myEnum = myList->GetEnumerator[]; while [ myEnum->MoveNext[] ] { Object^ obj = safe_cast[myEnum->Current]; Console::WriteLine[ "\t[{0}]:\t{1}", i++, obj ]; } Console::WriteLine[]; } /* This code produces the following output. The ArrayList initially contains the following values: [0]: The [1]: QUICK [2]: BROWN [3]: FOX [4]: jumps [5]: over [6]: the [7]: lazy [8]: dog After sorting from index 1 to index 3 with the default comparer: [0]: The [1]: BROWN [2]: FOX [3]: QUICK [4]: jumps [5]: over [6]: the [7]: lazy [8]: dog After sorting from index 1 to index 3 with the reverse case-insensitive comparer: [0]: The [1]: QUICK [2]: FOX [3]: BROWN [4]: jumps [5]: over [6]: the [7]: lazy [8]: dog */ using System; using System.Collections; public class SamplesArrayList3 { public class myReverserClass : IComparer { // Calls CaseInsensitiveComparer.Compare with the parameters reversed. int IComparer.Compare[Object x, Object y] { return [[new CaseInsensitiveComparer[]].Compare[y, x]]; } } public static void Main[] { // Creates and initializes a new ArrayList. ArrayList myAL = new ArrayList[]; myAL.Add["The"]; myAL.Add["QUICK"]; myAL.Add["BROWN"]; myAL.Add["FOX"]; myAL.Add["jumps"]; myAL.Add["over"]; myAL.Add["the"]; myAL.Add["lazy"]; myAL.Add["dog"]; // Displays the values of the ArrayList. Console.WriteLine["The ArrayList initially contains the following values:"]; PrintIndexAndValues[myAL]; // Sorts the values of the ArrayList using the default comparer. myAL.Sort[1, 3, null]; Console.WriteLine["After sorting from index 1 to index 3 with the default comparer:"]; PrintIndexAndValues[myAL]; // Sorts the values of the ArrayList using the reverse case-insensitive comparer. IComparer myComparer = new myReverserClass[]; myAL.Sort[1, 3, myComparer]; Console.WriteLine["After sorting from index 1 to index 3 with the reverse case-insensitive comparer:"]; PrintIndexAndValues[myAL]; } public static void PrintIndexAndValues[IEnumerable myList] { int i = 0; foreach [Object obj in myList] Console.WriteLine["\t[{0}]:\t{1}", i++, obj]; Console.WriteLine[]; } } /* This code produces the following output. The ArrayList initially contains the following values: [0]: The [1]: QUICK [2]: BROWN [3]: FOX [4]: jumps [5]: over [6]: the [7]: lazy [8]: dog After sorting from index 1 to index 3 with the default comparer: [0]: The [1]: BROWN [2]: FOX [3]: QUICK [4]: jumps [5]: over [6]: the [7]: lazy [8]: dog After sorting from index 1 to index 3 with the reverse case-insensitive comparer: [0]: The [1]: QUICK [2]: FOX [3]: BROWN [4]: jumps [5]: over [6]: the [7]: lazy [8]: dog */ Imports System.Collections Public Class SamplesArrayList Public Class myReverserClass Implements IComparer ' Calls CaseInsensitiveComparer.Compare with the parameters reversed. Public Function Compare[ ByVal x As Object, ByVal y As Object] As Integer _ Implements IComparer.Compare Return New CaseInsensitiveComparer[].Compare[y, x] End Function 'IComparer.Compare End Class Public Shared Sub Main[] ' Creates and initializes a new ArrayList. Dim myAL As New ArrayList[] myAL.Add["The"] myAL.Add["QUICK"] myAL.Add["BROWN"] myAL.Add["FOX"] myAL.Add["jumps"] myAL.Add["over"] myAL.Add["the"] myAL.Add["lazy"] myAL.Add["dog"] ' Displays the values of the ArrayList. Console.WriteLine["The ArrayList initially contains the following values:"] PrintIndexAndValues[myAL] ' Sorts the values of the ArrayList using the default comparer. myAL.Sort[1, 3, Nothing] Console.WriteLine["After sorting from index 1 to index 3 with the default comparer:"] PrintIndexAndValues[myAL] ' Sorts the values of the ArrayList using the reverse case-insensitive comparer. Dim myComparer = New myReverserClass[] myAL.Sort[1, 3, myComparer] Console.WriteLine["After sorting from index 1 to index 3 with the reverse case-insensitive comparer:"] PrintIndexAndValues[myAL] End Sub Public Shared Sub PrintIndexAndValues[myList As IEnumerable] Dim i As Integer = 0 Dim obj As [Object] For Each obj In myList Console.WriteLine[vbTab + "[{0}]:" + vbTab + "{1}", i, obj] i = i + 1 Next obj Console.WriteLine[] End Sub End Class 'This code produces the following output. 'The ArrayList initially contains the following values: ' [0]: The ' [1]: QUICK ' [2]: BROWN ' [3]: FOX ' [4]: jumps ' [5]: over ' [6]: the ' [7]: lazy ' [8]: dog ' 'After sorting from index 1 to index 3 with the default comparer: ' [0]: The ' [1]: BROWN ' [2]: FOX ' [3]: QUICK ' [4]: jumps ' [5]: over ' [6]: the ' [7]: lazy ' [8]: dog ' 'After sorting from index 1 to index 3 with the reverse case-insensitive comparer: ' [0]: The ' [1]: QUICK ' [2]: FOX ' [3]: BROWN ' [4]: jumps ' [5]: over ' [6]: the ' [7]: lazy ' [8]: dog

   Remarks

   If comparer is set to null, this method performs a comparison sort [also called an unstable sort]; that is, if two elements are equal, their order might not be preserved. In contrast, a stable sort preserves the order of elements that are equal. To perform a stable sort, you must implement a custom IComparer interface.

   On average, this method is an O[n log n] operation, where n is count; in the worst case it is an O[n^2] operation.

   See also

   • Performing Culture-Insensitive String Operations in Collections

   Applies to

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