How to get Method Reference for all methods in a class (Java)?

Test.java

import java.lang.invoke.LambdaMetafactory;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.function.DoubleUnaryOperator;

class Test {
    public static double op0(double a) {
        return a;
    }

    public static double op1(double a) {
        return a;
    }

    public static double op2(double a) {
        return a;
    }

    public static double op3(double a) {
        return a;
    }

    public static double op4(double a) {
        return a;
    }

    static final Map<String, DoubleUnaryOperator> OPS;
    static {
        HashMap<String, DoubleUnaryOperator> map = new HashMap<>();
        MethodType type = MethodType.methodType(double.class, double.class);
        MethodType inT = MethodType.methodType(DoubleUnaryOperator.class);
        MethodHandles.Lookup l = MethodHandles.lookup();
        for (Method m : Test.class.getDeclaredMethods())
            try {
                if (!Modifier.isStatic(m.getModifiers()))
                    continue;
                MethodHandle mh = l.unreflect(m);
                if (!mh.type().equals(type))
                    continue;
                map.put(m.getName(), (DoubleUnaryOperator) LambdaMetafactory.metafactory(
                        l, "applyAsDouble", inT, type, mh, type).getTarget().invokeExact());
            } catch (Throwable ex) {
                throw new ExceptionInInitializerError(ex);
            }
        OPS = Collections.unmodifiableMap(map);
    }

    public static void main(String args[]) {
        OPS.forEach((name, op) -> System.out.println(name + '(' + 42 + ") => " + op.applyAsDouble(42)));

    }
}