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Sorting Employee based on Name of the Employee using collections in java

package CollectionsExamples;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Employee1 {
    private int id;
    private String name;
    private int age;
  
    public Employee1(int id,String name,int age) {
        this.age = age;
        this.id = id;
        this.name = name;
    }
    public int getId() {
        return id;
    }
    /*public void setId(int id) {
        this.id = id;
    }*/
    public String getName() {
        return name;
    }
    /*public void setName(String name) {
        this.name = name;
    }*/
    public int getAge() {
        return age;
    }
    /*public void setAge(int age) {
        this.age = age;
    }*/
    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return id+" "+name+" "+age;
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
List<Employee1> li=new ArrayList<Employee1>();
Employee1 e=new Employee1(9,"chaitu",26);
Employee1 e1=new Employee1(2,"mahesh",22);
Employee1 e2=new Employee1(8,"vinay",28);
Employee1 e3=new Employee1(6,"ravi",16);
li.add(e);
li.add(e1);
li.add(e2);
li.add(e3);
li.add(new Employee1(7,"Ajay",24));
li.add(new Employee1(7,"bala",24));
System.out.println(li);
Collections.sort(li, new MyComparator1());
System.out.println(li);

    }
  
}

________________________

package CollectionsExamples;

import java.util.Comparator;


public class MyComparator1 implements Comparator<Employee1> {

    public int compare(Employee1 o1, Employee1 o2) {
       
        String name1=o1.getName();
        String name2=o2.getName();
        return name1.compareTo(name2);
    }

}

Sorting List with collection of Strings in Java

Sorting String List using Collections Sort Behaviour

package collections;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class CollectionSortExample {

    public static void main(String[] args) {

    List<String> li=new ArrayList<String>();
    li.add("pavan");
    li.add("ravi");
    li.add("chaitu");
    li.add("basha");
    li.add("vasu");
    li.add("shami");
    System.out.println("Before Sorting List:    "+li);
    Collections.sort(li);
    System.out.println("\nAfter Sorting the List:"+li);
   
    }
}
O/P:
Before Sorting List:    [pavan, ravi, chaitu, basha, vasu, shami]

After Sorting the List:[basha, chaitu, pavan, ravi, shami, vasu]

Converting a number into single Digit

public class SingleNumber  {
public void m1()
{
System.out.println("hai");
}
    public static void main(String[] args) {
        int num=99998,sum=0;
        while(num>9)
        {
             sum=0;
            while(num!=0)
            {
            int r=num%10;
            sum=sum+r;
            num=num/10;
            }
               num=sum;
        }   
        System.out.println(sum);
        }
    }

Save and run this program u will get out put as shown below:
8

Sorting an Array in java

package collections;

import java.util.Arrays;

public class ArraySortExample {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] i={10,6,8,25,99,100};
        System.out.println("Before Sorting:");
        for(int j:i)
            System.out.print(j+" ");
        Arrays.sort(i);
        System.out.println("\n After Sorting:");
        for(int k=0;k<i.length;k++)
            System.out.print(i[k]+" ");
    }

}

O/P:
Before Sorting:
10 6 8 25 99 100
 After Sorting:
6 8 10 25 99 100

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Sorting Element of list using Comparable interface

  Here is an Example to sort list of added objects to an array list using Comparable  interface.
  import java.util.ArrayList;
    import java.util.Collections;

    public class Sort1 implements Comparable<Object>
    {
    int age;
    String name;
    Sort1(int age,String name)
    {
        this.age=age;
        this.name=name;
    }
    public String toString()
    {
        return "age:" +age+" "+ "name:" +name;
    }
    public int compareTo(Object o)
    {
        return ((Sort1)o).age-age;
    }
    public static void main(String[] args)
    {
        ArrayList<Sort1> list=new ArrayList<Sort1>();
        list.add(new Sort1(60,"byz"));
        list.add(new Sort1(10,"xbc"));
        list.add(new Sort1(20,"ahaitu"));
        Collections.sort(list);
        System.out.println(list);
      
      
    }
    }

Comparing Objects Added to list

Hi Friends



Here we are comparing added objects to list using  Comparator Interface.For this First declare the Employee class as shown below:



import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Employee1 {
    private int id;
    private String name;
    private int age;
 
    public Employee1(int id,String name,int age) {
        //super();
        this.age = age;
        this.id = id;
        this.name = name;
    }
    public int getId() {
        return id;
    }
    /*public void setId(int id) {
        this.id = id;
    }*/
    public String getName() {
        return name;
    }
    /*public void setName(String name) {
        this.name = name;
    }*/
    public int getAge() {
        return age;
    }
    /*public void setAge(int age) {
        this.age = age;
    }*/
    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return id+" "+name+" "+age;
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
List<Employee1> li=new ArrayList<Employee1>();
Employee1 e=new Employee1(9,"chaitu",26);
Employee1 e1=new Employee1(2,"mahesh",22);
Employee1 e2=new Employee1(8,"vinay",28);
Employee1 e3=new Employee1(6,"ravi",16);
li.add(e);
li.add(e1);
li.add(e2);
li.add(e3);
Collections.sort(li, new MyComparator1());
System.out.println(li);

    }
 
}

Then write the MyComparator1 Class  as shown below

import java.util.Comparator;


public class MyComparator1 implements Comparator<Employee1> {

    @Override
    public int compare(Employee1 o1, Employee1 o2) {
        // TODO Auto-generated method stub
        if(o1.getAge()>o2.getAge())
        return -1;
        else if(o1.getAge()<o2.getAge())
         
            return 1;
        else
        return 0;
        /*if(o1.getId()>o2.getId())
            return 1;
            else if(o1.getId()<o2.getId())
                return -1;
            else
            return 0;*/
    }

}

Now see this results your requirement.

Here it return results based on age in ascending order.

Singleton Example in java

public class Singleton {

    /**
     * @param args
     */
    private  static Singleton instance;
    private Singleton()
    {
       
    }
    public static Singleton createInstance()
    {
        if(instance==null)
        {
            instance=new Singleton();
        }
        return instance;
    }
    public static void main(String[] args) {
       
// TODO Auto-generated method stub
Singleton s1=Singleton.createInstance();
Singleton s2=Singleton.createInstance();
Singleton s3=Singleton.createInstance();
System.out.println(s1+ " "+s2+" "+s3);
    }

}

Adding 2 Arrays

public class ArrayAddition {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
int[] a={1,2,3};
int[] b={2,3,4};
int[] c=new int[a.length];
    for (int i = 0; i < a.length; i++)
    {
        for (int j = 0; j < b.length; j++)
        {
            if(i==j)
            {
                c[i]=a[i]+b[j];
                System.out.print(c[i]+" ");
            }
        }
    }
 }
}