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Program to Convert a Vector to List in Java

Last Updated : 11 Dec, 2018

Given a Vector, the task is to Convert Vector to List in Java

Input: Vector: [1, 2, 3, 4, 5]
Output: List: [1, 2, 3, 4, 5]

Input : Vector = [a, b, c, d, e, f]
Output : List  = [a, b, c, d, e, f]

• Using Collections.list() method Syntax:

  List list = Collections.list(vec.elements());
  

  Approach:
  1. Get the Vector
  2. Convert into list using Collections.list(vector.elements()) method, which returns a List of objects.
  3. Print the List
  Below is the implementation of the above approach: Java

  // Java program to
  // convert vector to List
  
  import java.util.*;
  
  public class GFG {
      public static void main(String[] args)
      {
  
          // Create a Vector of String elements
          Vector<String> vec = new Vector<String>();
  
          // Adding values of Vector
          vec.add("1");
          vec.add("2");
          vec.add("3");
          vec.add("4");
          vec.add("5");
  
          // print Vector elements
          System.out.println("Vector: " + vec);
  
          // Convert Vector to List
          List<String>
              list = Collections.list(vec.elements());
  
          // print List Elements
          System.out.println("List:" + list);
      }
  }
  

  Output:

  Vector: [1, 2, 3, 4, 5]
  List:[1, 2, 3, 4, 5]
  

• Using Collection.unmodifiableList() Syntax:

  List list = Collections.unmodifiableList(vector);
  

  Approach:
  1. Get the Vector
  2. Convert into list using Collections.unmodifiableList(vector) method, which returns an immutable List of objects.
  3. Print the List
  Below is the implementation of the above approach: Java

  // Java program to
  // convert vector to List
  
  import java.util.*;
  
  public class GFG {
      public static void main(String[] args)
      {
  
          // Create a Vector of String elements
          Vector<String> vec = new Vector<String>();
  
          // Adding values of Vector
          vec.add("1");
          vec.add("2");
          vec.add("3");
          vec.add("4");
          vec.add("5");
  
          // print Vector elements
          System.out.println("Vector: " + vec);
  
          // Convert Vector to List
          List<String>
              list = Collections.unmodifiableList(vec);
  
          // print List Elements
          System.out.println("List:" + list);
      }
  }
  

  Output:

  Vector: [1, 2, 3, 4, 5]
  List:[1, 2, 3, 4, 5]
  

• Using constructor Syntax:

  List list = new ArrayList(vector);
  

  Approach:
  1. Get the Vector
  2. Create a List from the Vector by passing the vector as the parameter.
  3. Print the List
  Below is the implementation of the above approach: Java

  // Java program to
  // convert vector to List
  
  import java.util.*;
  
  public class GFG {
      public static void main(String[] args)
      {
  
          // Create a Vector of String elements
          Vector<String> vec = new Vector<String>();
  
          // Adding values of Vector
          vec.add("1");
          vec.add("2");
          vec.add("3");
          vec.add("4");
          vec.add("5");
  
          // print Vector elements
          System.out.println("Vector: " + vec);
  
          // Convert Vector to List
          List<String>
              list = new ArrayList<String>(vec);
  
          // print List Elements
          System.out.println("List:" + list);
      }
  }
  

  Output:

  Vector: [1, 2, 3, 4, 5]
  List:[1, 2, 3, 4, 5]
  

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