In method overloading, the class can have multiple methods with the same name but the parameter list of the methods should not be the same. One way to make sure that the parameter list is different is to change the order of the arguments in the methods.A program that demonstrates this is given as follows −Example Live Democlass PrintValues {    public void print(int val1, char val2) {       System.out.println("The int value is: " + val1);       System.out.println("The char value is: " + val2);    }    public void print(char val1, int val2) {       ... Read More

Method overloading in a class contains multiple methods with the same name but the parameter list of the methods should not be the same. One of these methods can have a long parameter in their parameter list.A program that demonstrates this is given as follows −Example Live Democlass PrintValues {    public void print(int val) {       System.out.println("The int value is: " + val);    }    public void print(long val) {       System.out.println("The long value is: " + val);    } } public class Demo {    public static void main(String[] args) {       ... Read More

A class can have multiple methods with the same name but the parameter list of the methods should not be the same. This is known as method overloading. Method overloading is somewhat similar to constructor overloading.A program that demonstrates this is given as follows −Example Live Democlass PrintValues {    public void print(int val) {       System.out.println("The value is: " + val);    }    public void print(double val) {       System.out.println("The value is: " + val);    }    public void print(char val) {       System.out.println("The value is: " + val);    } } ... Read More

A copy constructor can be used to duplicate an object in Java. The copy constructor takes a single parameter i.e. the object of the same class that is to be copied. However, the copy constructor can only be explicitly created by the programmer as there is no default copy constructor provided by Java.A program that demonstrates this is given as follows −Example Live Democlass NumberValue {    private int num;    public NumberValue(int n) {       num = n;    }    public NumberValue(NumberValue obj) {       num = obj.num;    }    public void display() { ... Read More

There can be multiple constructors in a class. However, the parameter list of the constructors should not be same. This is known as constructor overloading.A program that demonstrates this is given as follows −Example Live Democlass NumberValue {    private int num;    public NumberValue() {       num = 6;    }    public NumberValue(int n) {       num = n;    }    public void display() {       System.out.println("The number is: " + num);    } } public class Demo {    public static void main(String[] args) {       NumberValue obj1 = ... Read More

The method java.time.Matcher.group() is used to find the subsequence in the input sequence string that is a match to the required pattern. This method returns the subsequence that is matched by the previous match which can even be empty.A program that demonstrates the method Matcher.group() 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[]) { Pattern p = Pattern.compile("\w\d"); Matcher m = p.matcher("This is gr8"); System.out.println("The input ... Read More

A class declaration can contain a method that has a parameter in Java. A program that demonstrates this is given as follows:Example Live Democlass Message {    public void messagePrint(String msg) {       System.out.println("The message is: " + msg);    } } public class Demo { public static void main(String args[]) { Message m = new Message(); m.messagePrint("Java is fun"); } }OutputThe message is: Java is funNow let us understand the above program.The Message class is created with a single member ... Read More

Method overriding can be prevented by using the final keyword with a method. In other words, a final method cannot be overridden.A program that demonstrates this is given as follows:Exampleclass A {    int a = 8;    final void print() {       System.out.println("Value of a: " + a);    } } class B extends A {    int b = 3;    void print() {       System.out.println("Value of b: " + b);    } } public class Demo { public static void main(String args[]) { B ... Read More

A variable cannot be modified after it is declared as final. In other words, a final variable is constant. So, a final variable must be initialized and an error occurs if there is any attempt to change the value.A program that demonstrates a final variable in Java is given as follows −Example Live Demopublic class Demo {    public static void main(String[] args) {       final double PI = 3.141592653589793;       System.out.println("The value of pi is: " + PI);    } }OutputThe value of pi is: 3.141592653589793Now let us understand the above program.In the main() method in ... Read More

The representation of the regular expressions are available in the java.util.regex.Pattern class. This class basically defines a pattern that is used by the regex engine.A program that demonstrates using the Pattern class to match in Java 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[]) {       Pattern p = Pattern.compile("p+");       Matcher m = p.matcher("apples and peaches are tasty");       System.out.println("The input string is: apples and peaches are tasty");       System.out.println("The Regex is: p+ ");       System.out.println();     ... Read More