How to sort arraylist in ascending order in java
test
package com.candidjava;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
public class ArrayListAscending {
public static void main(String[] args) {
ArrayList al = new ArrayList();
al.add("reena");
al.add("teena");
al.add("anu");
al.add("zahir");
al.add("sonu");
System.out.println("Unsorted ArrayList:");
System.out.println(al);
// Sorting Arraylist in ascending order
System.out.println("Arraylist in Ascending order:");
Collections.sort(al);
Iterator itr = al.iterator();
while (itr.hasNext()) {
String name = (String) itr.next();
System.out.println(name);
}
}
}
OutPut
Unsorted ArrayList: [reena, teena, anu, zahir, sonu] Arraylist in Ascending order: anu reena sonu teena zahir
How to sort arraylist in descending order in java
test
package com.candidjava;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
public class ArrayListDescending {
public static void main(String[] args) {
ArrayList al = new ArrayList();
al.add("reena");
al.add("teena");
al.add("anu");
al.add("zahir");
al.add("sonu");
System.out.println("Unsorted Arraylist:");
System.out.println(al);
// Sorting in descending order
System.out.println("Arraylist in descending order:");
Collections.sort(al, Collections.reverseOrder());
System.out.println(al);
Iterator itr = al.iterator();
while (itr.hasNext()) {
String name = (String) itr.next();
System.out.println(name);
}
}
}
Out Put
Unsorted Arraylist: [reena, teena, anu, zahir, sonu] Arraylist in descending order: [zahir, teena, sonu, reena, anu] zahir teena sonu reena anu
How to sort arraylist in java without using sort method
package com.candidjava;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
public class Arraylistsortwithoutsortmethod {
public static void main(String[] args) {
ArrayList al = new ArrayList();
al.add("reena");
al.add("teena");
al.add("anu");
al.add("zahir");
al.add("sonu");
System.out.println("Unsorted Arraylist:");
System.out.println(al);
int count = al.size();
String temp;
Object[] name = al.toArray();
for (int i = 0; i < count; i++) {
for (int j = i + 1; j < count; j++) {
if (((String) name[i]).compareTo((String) name[j]) > 0) {
temp = (String) name[i];
name[i] = name[j];
name[j] = temp;
}
}
}
System.out.println("Sorted Arraylist:");
for (int a = 0; a < name.length; a++) {
System.out.println(name[a]);
}
}
}
Out Put
Unsorted Arraylist: [reena, teena, anu, zahir, sonu] Arraylist in descending order: [zahir, teena, sonu, reena, anu] zahir teena sonu reena anu
How to Int sort arraylist in java without using sort method
package com.candidjava;
import java.util.ArrayList;
public class Intarraysortingwithoutsort {
public static void main(String[] args) {
ArrayList<Integer> al = new ArrayList<Integer>();
al.add(10);
al.add(60);
al.add(20);
al.add(70);
al.add(100);
System.out.println("unsorted arraylist:");
System.out.println(al);
for (int i = 0; i < al.size(); i++) {
for (int j = i + 1; j < al.size(); j++) {
if (al.get(i) > al.get(j)) {
int tmp = al.get(i);
al.set(i, al.get(j));
al.set(j, tmp);
}
}
}
System.out.println("Sorted Arraylist:");
for (int i : al) {
System.out.println(i);
}
}
}
Out Put
unsorted arraylist: [10, 60, 20, 70, 100] Sorted Arraylist: 10 20 60 70 100
Java sort arraylist of objects by field using comparable
package com.candidjava;
import java.util.ArrayList;
import java.util.Collections;
class Author implements Comparable<Author> {
String authorname;
String bookname;
int bookprice;
// constructor for author
Author(String authorname, String bookname, int bookprice) {
this.authorname = authorname;
this.bookname = bookname;
this.bookprice = bookprice;
}
// Printing Author in the main
public String toString() {
return this.authorname + " " + this.bookname + " " + this.bookprice;
}
public String getAuthorname() {
return authorname;
}
public void setAuthorname(String authorname) {
this.authorname = authorname;
}
@Override
public int compareTo(Author o) {
return this.getAuthorname().compareTo(o.getAuthorname());
}
}
public class Arraylistsortcomparable {
public static void main(String[] args) {
ArrayList<Author> al = new ArrayList<Author>();
al.add(new Author("Shakespeare", "The Tragedy of Macbeth", 300));
al.add(new Author("Shakespeare", "The Winters Tale", 350));
al.add(new Author("Vairamuthu", "Moondram ulaga por", 500));
al.add(new Author("Dr.A.P.J", "Agni siragugal", 200));
al.add(new Author("James Gosling", "JAVA Programming Language", 400));
System.out.println("Unsorted Arraylist");
for (int i = 0; i < al.size(); i++) {
System.out.println(al.get(i));
}
// Ascending Order
System.out.println("--------------------------------------------");
System.out.println("Sorted Array list");
System.out.println("--------------------------------------------");
Collections.sort(al);
for (int i = 0; i < al.size(); i++) {
System.out.println(al.get(i));
}
}
}Out Put
Unsorted Arraylist Shakespeare The Tragedy of Macbeth 300 Shakespeare The Winters Tale 350 Vairamuthu Moondram ulaga por 500 Dr.A.P.J Agni siragugal 200 James Gosling JAVA Programming Language 400 -------------------------------------------- Sorted Array list -------------------------------------------- Dr.A.P.J Agni siragugal 200 James Gosling JAVA Programming Language 400 Shakespeare The Tragedy of Macbeth 300 Shakespeare The Winters Tale 350 Vairamuthu Moondram ulaga por 500
Java arraylist sort comparator
package com.candidjava;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
class Studentdata {
int rno;
String name;
int age;
// Constructor for Studentdata
Studentdata(int rno, String name, int age) {
this.rno = rno;
this.name = name;
this.age = age;
}
// Used to print studentdetails in main method
public String toString() {
return this.rno + " " + this.name + " " + this.age;
}
}
// This class is for Student name sort
class Namesort implements Comparator<Studentdata> {
@Override
public int compare(Studentdata o1, Studentdata o2) {
return o1.name.compareTo(o2.name);
}
}
// This class id for Student Roll number sort
class Rollnosort implements Comparator<Studentdata> {
@Override
public int compare(Studentdata o1, Studentdata o2) {
return o1.rno - o2.rno;
}
}
public class Arraylistsortcomparator {
public static void main(String[] args) {
ArrayList<Studentdata> al = new ArrayList<Studentdata>();
al.add(new Studentdata(15, "reena", 12));
al.add(new Studentdata(30, "teena", 24));
al.add(new Studentdata(21, "meena", 20));
al.add(new Studentdata(21, "seetha", 20));
System.out.println("Unsorted Arraylist");
for (int i = 0; i < al.size(); i++) {
System.out.println(al.get(i));
}
// Ascending Order
System.out.println("Sorted by Name in Ascending order:");
Collections.sort(al, new Namesort());
for (int i = 0; i < al.size(); i++) {
System.out.println(al.get(i));
}
System.out.println("Sorted by Rollno in Ascending order:");
Collections.sort(al, new Rollnosort());
for (int i = 0; i < al.size(); i++) {
System.out.println(al.get(i));
}
// Descending order
System.out.println("Sorted by Name in Descending order:");
Collections.sort(al, Collections.reverseOrder(new Namesort()));
for (int i = 0; i < al.size(); i++) {
System.out.println(al.get(i));
}
System.out.println("Sorted by Rollno in Descending order:");
Collections.sort(al, Collections.reverseOrder(new Rollnosort()));
for (int i = 0; i < al.size(); i++) {
System.out.println(al.get(i));
}
}
}
Out Put
Unsorted Arraylist 15 reena 12 30 teena 24 21 meena 20 21 seetha 20 Sorted by Name in Ascending order: 21 meena 20 15 reena 12 21 seetha 20 30 teena 24 Sorted by Rollno in Ascending order: 15 reena 12 21 meena 20 21 seetha 20 30 teena 24 Sorted by Name in Descending order: 30 teena 24 21 seetha 20 15 reena 12 21 meena 20 Sorted by Rollno in Descending order: 30 teena 24 21 seetha 20 21 meena 20 15 reena 12
