Java Method getParameterCount() Method

The getParameterCount() method of Method class Returns the number of formal parameters (whether explicitly declared or implicitly declared or neither) for the executable represented by this object.

Syntax

Parameter

No parameter is passed.

Returns

The number of formal parameters for the executable this object represents

Throws

Does not throw an exception.

Example 1

//import statement
import java.lang.reflect.Method; //import Method class of lang package
public class ReflectMethodgetParameterCountExample1 {
    public static void proc(int i, String s, String... args) {}

    public static void main(String... args) throws NoSuchMethodException {  //main method
        Method mthd = ReflectMethodgetParameterCountExample1.class.getDeclaredMethod("proc", int.class, String.class, String[].class); 
        int paramCount = mthd.getParameterCount();//get the total no. of parameter
        System.out.println(paramCount);  //print statemet
    }
}

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Output:

Example 2

//import statements

import java.lang.reflect.Method;

public class ReflectMethodgetParameterCountExample2  {
    public static void method1(int x, int y, double z, String str) {}

    public static void main(String... args) throws NoSuchMethodException {
        Method mthd = ReflectMethodgetParameterCountExample2.class.getDeclaredMethod("method1", int.class, int.class, double.class , String.class);  //pass classes of types of parameter
        int paramCount = mthd.getParameterCount();  //get the total no. of parameter
        System.out.println("No of parameters in method1 :  "  +paramCount);
    }
}

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Output: