package com.landtool.lanbase.UNUSED;

import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;

public class MethodHandle {
    @Override
    public String toString() {

        return super.toString() + "==MethodHandle";
    }

    public static void main(String[] args) throws Throwable {
        MethodHandle handle = new MethodHandle();
        MethodType methodType = MethodType.methodType(String.class);

        MethodHandles.Lookup lookup = MethodHandles.lookup();

        java.lang.invoke.MethodHandle methodHandle = lookup.findVirtual(MethodHandle.class, "toString", methodType);
        String toString = (String) methodHandle.invokeExact(handle);
        System.out.println(toString);// com.doctor.java7.MethodHandle@355da254==MethodHandle

        // or like this:
        java.lang.invoke.MethodHandle methodHandle2 = methodHandle.bindTo(handle);
        String toString2 = (String) methodHandle2.invokeWithArguments();
        System.out.println(toString2);// com.doctor.java7.MethodHandle@355da254==MethodHandle

        // 得到当前Class的不同表示方法，最后一个最好。一般我们在静态上下文用SLF4J得到logger用。
        System.out.println(MethodHandle.class);
        System.out.println(handle.getClass());
        System.out.println(MethodHandles.lookup().lookupClass()); // like getClass()
    }
}