The java.util.Vector.setSize() method can be used to set the size of a Vector in Java. If the new size that is set is greater than the old size of the Vector, then null values are added to the positions created. If the new size that is set is lesser than the old size of the Vector, then the elements at positions more than the new size are discarded.A program that demonstrates this is given as follows:Example Live Demoimport java.util.Vector; public class Demo { public static void main(String args[]) { Vector vec = ... Read More

All the elements of a vector can be replaced by a specific element using java.util.Collections.fill() method. This method requires two parameters i.e. the Vector and the element that replaces all the elements in the Vector. No value is returned by the Collections.fill() method.A program that demonstrates this is given as follows:Example Live Demoimport java.util.Collections; import java.util.Vector; public class Demo { public static void main(String args[]) { Vector vec = new Vector(5); vec.add(7); vec.add(4); vec.add(1); ... Read More

An element of a Vector can be searched using the method java.util.ArrayList.indexOf(). This method returns the index of the first occurrence of the element that is specified. If the element is not available in the Vector, then this method returns -1.A program that demonstrates this is given as follows:Example Live Demoimport java.util.Vector; public class Demo { public static void main(String args[]) { Vector vec = new Vector(5); vec.add(4); vec.add(1); vec.add(7); ... Read More

An element in a Vector can be replaced at a specified index using the java.util.Vector.set() method. This method has two parameters i.e the index at which the Vector element is to be replaced and the element that it should be replaced with. Vector.set() method returns the element that was at the position specified at the index previously.A program that demonstrates this is given as follows:Example Live Demoimport java.util.Vector; public class Demo { public static void main(String args[]) { Vector vec = new Vector(5); vec.add(7); ... Read More

A single element in the Vector can be removed using the java.util.Vector.remove() method. This method removes the element at the specified index in the Vector. It returns the element that was removed. Also after the element is removed from the specified index, the rest of the Vector elements are shifted to the left.A program that demonstrates this is given as follows:Example Live Demoimport java.util.Vector; public class Demo { public static void main(String args[]) { Vector vec = new Vector(5); vec.add(4); ... Read More

A Vector can be cleared in Java using the method java.util.Vector.clear(). This method removes all the elements in the Vector. There are no parameters required by the Vector.clear() method and it returns no value.A program that demonstrates this is given as follows −Example Live Demoimport java.util.Vector; public class Demo {    public static void main(String args[]) {       Vector vec = new Vector(5);       vec.add(4);       vec.add(1);       vec.add(3);       vec.add(9);       vec.add(6);       vec.add(2);       vec.add(8);       System.out.println("The Vector elements are: " ... Read More

A Vector can be printed in a comma-delimited list, in index order and surrounded by square brackets ([]) by simply using System.out.println() along with the Vector object.A program that demonstrates this is given as follows −Example Live Demoimport java.util.Vector; public class Demo {    public static void main(String args[]) {       Vector vec = new Vector(5);       vec.add(4);       vec.add(1);       vec.add(3);       vec.add(9);       vec.add(6);       System.out.println(vec);    } }The output of the above program is as follows −[4, 1, 3, 9, 6]Now let us understand ... Read More

The method java.time.Matcher.pattern() returns the pattern that is matched upon by the Matcher. This method accepts no parameters.A program that demonstrates the method Matcher.pattern() in Java regular expressions is given as follows −Example Live Demoimport java.util.regex.Matcher; import java.util.regex.Pattern; public class Demo {    public static void main(String args[]) {       String regex = "Apple";       Pattern p = Pattern.compile(regex);       Matcher m = p.matcher("AppleIsAFruit");       System.out.println("Pattern: " + m.pattern());    } }The output of the above program is as follows −Pattern: AppleNow let us understand the above program.The pattern that is matched upon ... Read More

A class contains a constructor to initialize instance variables in Java. This constructor is called when the class object is created.A program that demonstrates this is given as follows −Example Live Democlass Student {    private int rno;    private String name;    public Student(int r, String n) {       rno = r;       name = n;    }    public void display() {       System.out.println("Roll Number: " + rno);       System.out.println("Name: " + name);    } } public class Demo {    public static void main(String[] args) {       Student ... Read More

The elements of a Collection can be appended at the end of the Vector using the method java.util.Vector.addAll(). This method takes a single parameter i.e. the Collection whose elements are added to the Vector and it returns true if the Vector is changed.A program that demonstrates this is given as follows −Example Live Demoimport java.util.Vector; public class Demo {    public static void main(String args[]) {       Vector vec1 = new Vector();       vec1.add(7);       vec1.add(3);       vec1.add(5);       vec1.add(9);       vec1.add(2);       System.out.println("The Vector vec1 elements ... Read More