Java Vector setSize() Method with Examples

by Online Tutorials Library July 22, 2022

Java Vector setSize() Method

The setSize() method of Java Vector class is used to set the size of a vector. If the new size is greater than the current size, null items are added to the end of the vector. Otherwise, all components at index newSize and greater are discarded.

Syntax

Following is the declaration of setSize() method:

Parameter

Parameter	Description	Required/Optional
newSize	It is the new size of the vector.	Required

Return

The setSize() method does not return anything. It only set the new size of the vector.

Exceptions

ArrayIndexOutOfBoundsException– This method has thrown an exception if the new size of the vector is negative i.e. newSize < 0.

Compatibility Version

Java 1.2 and above

Example 1

  import java.util.*;  public class VectorSetSizeExample1 {    public static void main(String arg[]) {      //Create an empty vector       Vector<Integer> vec = new Vector<>();      //Add elements in the vector      vec.add(1);      vec.add(2);      vec.add(3);      System.out.println(“Components of the vector: “+vec);                  //Set the new size of the vector            vec.setSize(6);            //Displaying the vector elements after setting new size            System.out.println(“Components of the vector after setting new size: “);                      for (Integer num : vec) {                        System.out.println(“Number = ” +num);      }                    }  }  

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Output:

Components of the vector: [1, 2, 3]  Components of the vector after setting new size:   Number = 1  Number = 2  Number = 3  Number = null  Number = null  Number = null

Example 2

  import java.util.*;  public class VectorSetSizeExample2 {    public static void main(String arg[]) {      //Create an empty vector      Vector < String > colors = new Vector < String > ();      //Add elements in the vector            colors.add(“White”);            colors.add(“Green”);            colors.add(“Black”);            //Displaying the vector elements            System.out.println(“Components of a vector: “+colors);            //Set the new size for the vector            colors.setSize(6);            //Displaying the vector elements after setting new size            System.out.print(“Components of a vector after setting new size: “+colors);          }              }  

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Output:

Components of a vector: [White, Green, Black]  Components of a vector after setting new size: [White, Green, Black, null, null, null]

Example 3

  import java.util.*;  public class VectorSetSizeExample3 {    public static void main(String arg[]) {      //Create an empty vector       Vector<Integer> vec = new Vector<>();      //Add elements in the vector      vec.add(10);      vec.add(20);      vec.add(30);          //Set the new size of the vector      vec.setSize(-15);      //Displaying the vector element      System.out.println(“Vector element after setSize(): ” +vec);      }              }  

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Output:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -15  at java.base/java.util.Vector.setSize(Vector.java:314)  at myPackage.VectorSetSizeExample3.main(VectorSetSizeExample3.java:12)

Next TopicJava Vector Size Method

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Java Vector setSize() Method with Examples

Java Vector setSize() Method

Syntax

Parameter

Return

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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