Java Overloading Method
Java Tutorial » Java Overloading Method
Method overloading allows multiple methods that can have the same name with different signatures where the signature can differ by the number of input parameters:
Example:
int my_Method(int a)
float my_Method(float a)
double my_Method(double a, double b)
float my_Method(float a)
double my_Method(double a, double b)
Java program that can demonstrate how is working overloading method
Example: have two methods that add numbers of different type:
int: 27
double: 12.559999999999999
int: 71
public class Main {
// Overloaded sum(). This sum takes two int parameters
static int plus_MethodInt(int a, int b)
{
return a + b;
}
// Overloaded sum(). This sum takes two double parameters
static double plus_MethodDouble(double a, double b)
{
return a + b;
}
// Overloaded sum(). This sum takes three int parameters
static int sum(int a, int b, int c) {
return (a + b + c);
}
public static void main(String[] args)
{
int my_Num1 = plus_MethodInt(12, 15);
double my_Num2 = plus_MethodDouble(5.3, 7.26);
int my_Num3 = sum(4, 26, 41);
System.out.println("int: " + my_Num1);
System.out.println("double: " + my_Num2);
System.out.println("int: " + my_Num3);
}
}
Output:// Overloaded sum(). This sum takes two int parameters
static int plus_MethodInt(int a, int b)
{
return a + b;
}
// Overloaded sum(). This sum takes two double parameters
static double plus_MethodDouble(double a, double b)
{
return a + b;
}
// Overloaded sum(). This sum takes three int parameters
static int sum(int a, int b, int c) {
return (a + b + c);
}
public static void main(String[] args)
{
int my_Num1 = plus_MethodInt(12, 15);
double my_Num2 = plus_MethodDouble(5.3, 7.26);
int my_Num3 = sum(4, 26, 41);
System.out.println("int: " + my_Num1);
System.out.println("double: " + my_Num2);
System.out.println("int: " + my_Num3);
}
}
int: 27
double: 12.559999999999999
int: 71
Can we overload methods on return type? example
We cannot overload by return type. This behavior is same in C++. Refer this for details
Example
public class Main {
public int yaa() { return 24; }
// compiler error: yaa() is already defined
public char yaa() { return 'x'; }
public static void main(String args[])
{
}
}
public int yaa() { return 24; }
// compiler error: yaa() is already defined
public char yaa() { return 'x'; }
public static void main(String args[])
{
}
}
Overloading methods on return type are possible in cases where the data type of the function being called is explicitly specified
Example
24
x
// Java program to demonstrate the working of method
// overloading in static methods
public class Main {
public static int yaa(int x) { return 24; }
public static char yaa(int x, int y) { return 'x'; }
public static void main(String args[])
{
System.out.println(yaa(1));
System.out.println(yaa(1, 2));
}
}
Output:// overloading in static methods
public class Main {
public static int yaa(int x) { return 24; }
public static char yaa(int x, int y) { return 'x'; }
public static void main(String args[])
{
System.out.println(yaa(1));
System.out.println(yaa(1, 2));
}
}
24
x
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Java Overloading Methods - java
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