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java Method Overloading

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omkar bhagat
omkar bhagat

The document discusses method overloading in Java. It defines method overloading as allowing methods within the same class to have the same name but different signatures. The signature includes the number, order, and types of parameters. To overload a method, its signature must be changed but not the return type. An example demonstrates overloading the Addition method to take 2 or 3 integer parameters. When called, the correct overloaded method is invoked based on the number of arguments passed.

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Omkar M. Bhagat
Method Method Overloading
A collection of statements that are grouped together to perform an operation A method has the following syntax modifier return_Value_Type Method Name(list of parameters) { // Method body; } A method definition consists of a method header and a method body
1. Modifiers: Optional Tells the compiler how to call the method. Defines the access type of the method. 2. Return Types The data type of the value the method returns. the return type is the keyword void when no value is returned
Method Name The actual name of the method. Method name and the parameter list together constitute the method signature. Parameters Act as a placeholder. When a method is invoked, a value is passed to parameter. This value is referred to as actual parameter or argument. The parameter list refers to the type, order, and number of the parameters of a method. Parameters are optional; that is,
Method Body The method body contains a collection of statements that define what the method does.
A concept in Java which allows programmer to declare method with same name but different behavior. Method with same name co-exists in same class but they must have different method signature When you overload a method in Java its method signature gets changed
If you have two methods with same name in one Java class with different method signature than its called overloaded method in Java Generally overloaded method in Java has different set of arguments to perform something based on different number of input To overload a Java method just changes its signature.
To change signature, either change number of argument, type of argument or order of argument Since return type is not part of method signature changing return type will result in duplicate method and you will get compile time error in Java
public class MethodOverLoading { // Method 1 public static int Addition(int a, int b) { System.out.println(Method 1 is called); return a + b; } // Method 2 public static int Addition(int a, int b, int c) { System.out.println(Method 2 is called); return a + b + c; } }
public static void main(String[] args) { int Answer1 = Addition(5, 6); // In this case Method 1 will be called System.out.println(Answer 1 = + Answer1); System.out.println(----------------------------); int Answer2 = Addition(5, 6, 7); // In this case Method 2 will be called System.out.println(Answer 2 = + Answer2); }
Output of the code Method 1 is called Answer 1 = 11 ---------------------------- Method 2 is called Answer 2 = 18

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java Method Overloading

  • 3. A collection of statements that are grouped together to perform an operation A method has the following syntax modifier return_Value_Type Method Name(list of parameters) { // Method body; } A method definition consists of a method header and a method body
  • 4. 1. Modifiers: Optional Tells the compiler how to call the method. Defines the access type of the method. 2. Return Types The data type of the value the method returns. the return type is the keyword void when no value is returned
  • 5. Method Name The actual name of the method. Method name and the parameter list together constitute the method signature. Parameters Act as a placeholder. When a method is invoked, a value is passed to parameter. This value is referred to as actual parameter or argument. The parameter list refers to the type, order, and number of the parameters of a method. Parameters are optional; that is,
  • 6. Method Body The method body contains a collection of statements that define what the method does.
  • 7. A concept in Java which allows programmer to declare method with same name but different behavior. Method with same name co-exists in same class but they must have different method signature When you overload a method in Java its method signature gets changed
  • 8. If you have two methods with same name in one Java class with different method signature than its called overloaded method in Java Generally overloaded method in Java has different set of arguments to perform something based on different number of input To overload a Java method just changes its signature.
  • 9. To change signature, either change number of argument, type of argument or order of argument Since return type is not part of method signature changing return type will result in duplicate method and you will get compile time error in Java
  • 10. public class MethodOverLoading { // Method 1 public static int Addition(int a, int b) { System.out.println(Method 1 is called); return a + b; } // Method 2 public static int Addition(int a, int b, int c) { System.out.println(Method 2 is called); return a + b + c; } }
  • 11. public static void main(String[] args) { int Answer1 = Addition(5, 6); // In this case Method 1 will be called System.out.println(Answer 1 = + Answer1); System.out.println(----------------------------); int Answer2 = Addition(5, 6, 7); // In this case Method 2 will be called System.out.println(Answer 2 = + Answer2); }
  • 12. Output of the code Method 1 is called Answer 1 = 11 ---------------------------- Method 2 is called Answer 2 = 18