Example to find maxmimum element in a Vector

Example to find maximum element in a Vector

This java example shows how to find a maximum element of Java Vector using max method of Collections class.To find maximum element of Java Vector use, static Object max(Collection c) method of Collections class.

This method returns the maximum element of Java Vector according to its natural ordering.

    import java.util.Vector;
    import java.util.Collections;

    public class FindMaximumOfVectorExample {
     public static void main(String[] args) {

     //create a Vector object
     Vector v = new Vector();
     //Add elements to Vector
 
     v.add(new Double("324.4324"));
     v.add(new Double("345.3532"));
     v.add(new Double("342.342"));
     v.add(new Double("357.349"));
      v.add(new Double("23.32453"));

      Object obj = Collections.max(v);
     System.out.println("Maximum Element of Java Vector is : " + obj);

     }
    }

The Output is:

Maximum Element of Java Vector is : 357.349

Reference Books:

• Core Java : Advanced Features (Volume - 2) 8 Edition
• Core JavaServer Faces 3 Edition
• SCJP Sun Certified Programmer for Java 6 Study Exam 310
• Core JAVA : An Integrated Approach 1 Edition

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Example to Find maxmimum element in ArrayList

Example to Find maxmimum element in ArrayList

This java example shows how to find a maximum element of Java ArrayList using max method of Collections class.

To find maximum element of Java ArrayList use, static Object max(Collection c) method of Collections class.
This method returns the maximum element of Java ArrayList according to its natural ordering.

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

    public class FindMaximumOfArrayListExample {

     public static void main(String[] args) {

     //create an ArrayList object
     ArrayList arrayList = new ArrayList();

     //Add elements to Arraylist
     arrayList.add(new Integer("327482"));
     arrayList.add(new Integer("13408"));
     arrayList.add(new Integer("802348"));
     arrayList.add(new Integer("345308"));
     arrayList.add(new Integer("509324"));

     Object obj = Collections.max(arrayList);
     System.out.println("Maximum Element of Java ArrayList is : " + obj);

     }
    }

The Output :

Maximum Element of Java ArrayList is : 802348

Reference Books: 

• Core Java : Advanced Features (Volume - 2) 8 Edition
• Core JavaServer Faces 3 Edition
• SCJP Sun Certified Programmer for Java 6 Study Exam 310
• Core JAVA : An Integrated Approach 1 Edition

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Create a List containing n Copies of Specified Object

Create a List containing n Copies of Specified Object This java example shows how to create a list consisting n copies of specified copies using nCopies method of Collections class.

To create a List containing n copies of specified Object use static List nCopies(int n, Object obj) method of Java Collection class.This method returns immutable List containing n copies of the specified Object.

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Enumerate Vector using java.util.Enumeration

Enumerate through a Vector using Java Enumeration Example.This Java Example shows how to enumerate through elements of a Vector using Java Enumeration.

Enumeration provides two methods to enumerate through the elements. It's hasMoreElements method returns true if there are more elements to enumerate through otherwise it returns false. Its nextElement method returns the next element in enumeration.

static ArrayList list(Enumeration e) method of Collections class. This method returns the ArrayList containing the elements returned by specified Enumeration object in order they are returned.

    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.Enumeration;
    import java.util.Vector;

   public class CreateArrayListFromEnumerationExample {
   public static void main(String[] args) {
   //create a Vector object
   Vector v = new Vector();
   //Add elements to Vector

   v.add("A");
   v.add("B");
   v.add("D");
   v.add("E");
   v.add("F");
   
   System.out.println("Vector contains : " + v);
   //Get Enumeration over Vector
   Enumeration e = v.elements();
   //Create ArrayList from Enumeration of Vector
   ArrayList aList = Collections.list(e);
   System.out.println("Arraylist contains : " + aList);

  }
 }

Output is:

Vector Contains : [A, B, D, E, F]
Arraylist contains : [A, B, D, E, F]

Reference Books:

• Core JAVA : An Integrated Approach 1 Edition
• Core Java : Advanced Features (Volume - 2) 8 Edition
• Core JavaServer Faces 3 Edition

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Copy Elements of Vector to Java ArrayList Example

/*
  Copy Elements of Vector to Java ArrayList Example
  This java example shows how to copy elements of Java Vector to Java ArrayList using
  copy method of Collections class.
*/
 
import java.util.ArrayList;
import java.util.Collections;
import java.util.Vector;
 
public class CopyElementsOfVectorToArrayListExample {
 
  public static void main(String[] args) {
 
    //create a Vector object
    Vector v = new Vector();
 
    //Add elements to Vector
    v.add("1");
    v.add("2");
    v.add("3");
 
    //create an ArrayList object
    ArrayList arrayList = new ArrayList();
 
    //Add elements to Arraylist
    arrayList.add("One");
    arrayList.add("Two");
    arrayList.add("Three");
    arrayList.add("Four");
    arrayList.add("Five");
 
    /*
      To copy elements of Java Vector to Java ArrayList use,
      static void copy(List dstList, List sourceList) method of Collections class.
     
      This method copies all elements of source list to destination list. After copy
      index of the elements in both source and destination lists would be identical.
     
      The destination list must be long enough to hold all copied elements. If it is
      longer than that, the rest of the destination list's elments would remain
      unaffected.       
    */ 
 
    System.out.println("Before copy ArrayList Contains : " + arrayList);
 
    //copy all elements of Vector to ArrayList using copy method of Collections class
    Collections.copy(arrayList,v);
 
    /*
      Please note that, If ArrayList is not long enough to hold all elements of
      Vector, it throws IndexOutOfBoundsException.
    */
 
    System.out.println("After Copy ArrayList Contains : " + arrayList);   
  }
}
 
/*
Output would be
Before copy ArrayList Contains : [One, Two, Three, Four, Five]
After Copy ArrayList Contains : [1, 2, 3, Four, Five]
*/

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Copy Objects from One Vector to Another Vector using Java

Copy Elements of One Java Vector to Another Java Vector Example

This java example shows how to copy all elements of one Java Vector object to
another Java Vector object using copy method of Collections class.

 

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