Method Overloading

title: Method Overloading description: Java mein method overloading ka concept

Same class mein same naam ke multiple methods, lekin different parameters.

Rules

Parameter count alag ho, ya
Parameter types alag hoon, ya
Parameter order alag ho

java exampleWoHoTech

class Display {
    void show(int a) { System.out.println("int: " + a); }
    void show(double a) { System.out.println("double: " + a); }
    void show(String a) { System.out.println("String: " + a); }
    void show(int a, int b) { System.out.println("two ints: " + a + ", " + b); }
    void show(int a, double b) { System.out.println("int, double"); }
    void show(double a, int b) { System.out.println("double, int"); }
}

Overloading is NOT based on Return Type

java exampleWoHoTech

// Compile Error — sirf return type alag nahi kar sakte
int getValue() { return 1; }
double getValue() { return 1.0; } // ERROR

Type Promotion in Overloading

java exampleWoHoTech

class Test {
    void method(long a) { System.out.println("long"); }
}
Test t = new Test();
t.method(10); // int automatically long mein promote ho gaya

Real Example — println

System.out.println() bhi overloaded hai:

println(int)
println(double)
println(String)
println(boolean)
println(char[])

title: Method Overloading description: Java mein method overloading ka concept

Same class mein same naam ke multiple methods, lekin different parameters.

Rules

Parameter count alag ho, ya
Parameter types alag hoon, ya
Parameter order alag ho

java exampleWoHoTech

class Display {
    void show(int a) { System.out.println("int: " + a); }
    void show(double a) { System.out.println("double: " + a); }
    void show(String a) { System.out.println("String: " + a); }
    void show(int a, int b) { System.out.println("two ints: " + a + ", " + b); }
    void show(int a, double b) { System.out.println("int, double"); }
    void show(double a, int b) { System.out.println("double, int"); }
}

Overloading is NOT based on Return Type

java exampleWoHoTech

// Compile Error — sirf return type alag nahi kar sakte
int getValue() { return 1; }
double getValue() { return 1.0; } // ERROR

Type Promotion in Overloading

java exampleWoHoTech

class Test {
    void method(long a) { System.out.println("long"); }
}
Test t = new Test();
t.method(10); // int automatically long mein promote ho gaya

Real Example — println

System.out.println() bhi overloaded hai:

println(int)
println(double)
println(String)
println(boolean)
println(char[])

Method Overloading

Rules

Overloading is NOT based on Return Type

Type Promotion in Overloading

Real Example — println

Continue learning this concept

Method Overloading

Rules

Overloading is NOT based on Return Type

Type Promotion in Overloading

Real Example — println

Continue learning this concept