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Java8 Lambda Parameter Methods

Method Parameter Reflection: You can obtain the names of the formal parameters of any method or constructor with the method java.lang.reflect.Executable.getParameters. However, .class files do not store formal parameter names by default.
To store formal parameter names in a particular .class file, and thus enable the Reflection API to retrieve formal parameter names, compile the source file with the -parameters option of the javac compiler.

Creating Program in Java8(Lambda) for Parameter Methods

Follow the below steps to write program with java8(Lambda).
Step-1

Create a package com.javat.java8 under sources package. Then create the Interface java8parameter.java. Once you are ready then write the code as shown below.

Step-2

Create the Java class java8parametervalue.java. Once you are ready then write the code as shown below.

Step-3

Create the Java class LamdaParameterMethod.java. Once you are ready then write the code as shown below.

package com.javat.java8;

/**
 *
 * @author god
 */

interface java8parameter
{
    int test(int a);
    
}

class java8parametervalue
{
    void run(java8parameter t)
    {
        System.out.println("inplemented method execute....");
       int val= t.test(10);
       System.out.println("return value is "+val);
    }
}
public class LamdaParameterMethod {
    
     public static void main(String args[])
    {
        
        java8parametervalue obj=new java8parametervalue();
        
        // before lamda expression we do like wise code
        // Anonymous Inner Class
        obj.run(new java8parameter(){
            @Override
            public int test(int a)
            {
                System.out.println("without using java8 Lamda expression");
                System.out.println("before java 8 lamda expression need to write return type of method");
                return 1+a;
            }
            });
         
        obj.run((int a) -> { 
                 System.out.println("by using java8 lamda expression ");
                 System.out.println("in java 8 no need to write return type of method");        
                 return 2+a;});
}
}

Output

LamdaParameterMethod.java

Download example and run it on Netbeans IDE