add LookupFactory and MethodHandleUtil

hutool-core/src/test/java/cn/hutool/core/lang/reflect/MethodHandleUtilTest.java

@@ -0,0 +1,61 @@
+package cn.hutool.core.lang.reflect;
+
+import cn.hutool.core.util.ClassLoaderUtil;
+import cn.hutool.core.util.ReflectUtil;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+
+public class MethodHandleUtilTest {
+
+	@Test
+	public void invokeDefaultTest(){
+		Duck duck = (Duck) Proxy.newProxyInstance(
+				ClassLoaderUtil.getClassLoader(),
+				new Class[] { Duck.class },
+				MethodHandleUtil::invoke);
+
+		Assert.assertEquals("Quack", duck.quack());
+
+		// 测试子类执行default方法
+		final Method quackMethod = ReflectUtil.getMethod(Duck.class, "quack");
+		String quack = MethodHandleUtil.invoke(new BigDuck(), quackMethod);
+		Assert.assertEquals("Quack", quack);
+
+		// 测试反射执行默认方法
+		quack = ReflectUtil.invoke(new Duck() {}, quackMethod);
+		Assert.assertEquals("Quack", quack);
+	}
+
+	@Test
+	public void invokeDefaultByReflectTest(){
+		Duck duck = (Duck) Proxy.newProxyInstance(
+				ClassLoaderUtil.getClassLoader(),
+				new Class[] { Duck.class },
+				ReflectUtil::invoke);
+
+		Assert.assertEquals("Quack", duck.quack());
+	}
+
+	@Test
+	public void invokeTest(){
+		// 测试执行普通方法
+		final int size = MethodHandleUtil.invoke(new BigDuck(),
+				ReflectUtil.getMethod(BigDuck.class, "getSize"));
+		Assert.assertEquals(36, size);
+	}
+
+	interface Duck {
+		default String quack() {
+			return "Quack";
+		}
+	}
+
+	static class BigDuck implements Duck{
+		public int getSize(){
+			return 36;
+		}
+	}
+}