자바 8 의 새로운 문법 적 특성 도입 에 대한 간략 한 설명

package src;

import java.util.ArrayList;

interface MyLambdaFunc {
    public void call(int p);
}

class MyClass {
    
    public static void helloStaticMehtod(int a) {
        System.out.println("Static method value is: " + a);
    }
    
    public void memberMethod(int a) {
        System.out.println("Member method is: " + a);
    }
    
    public void method1(int a) {
        System.out.println("Method 1:" + (a + 1));
    }
    
    public void method2(int a) {
        System.out.println("Method 2: " + (a + 2));
    }
    
    public void method3(int a) {
        System.out.println("Method 3: " + (a + 3));
    }
}

public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("Hello, world");
        
        // Type inference
        ArrayList<String> arr = new ArrayList<>();
        arr.add("hello");
        
        // Lambda Expression test
        final int a = 10;
        
        MyLambdaFunc lambda = (p) -> {
            System.out.println("The value is: " + (a + p)); 
            };

        lambda.call(100);
// Method Reference test
        MyLambdaFunc methodRef = MyClass::helloStaticMehtod;
        methodRef.call(-100);
        
        MyClass mlc = new MyClass();
        methodRef = mlc::memberMethod;
        methodRef.call(-200);
        
        MyLambdaFunc methodList[] = { mlc::method1, mlc::method2, mlc::method3 };
        methodList[0].call(100);
        methodList[1].call(100);
        methodList[2].call(100);
    }
}