Examples of java.lang.invoke.MethodHandle.invokeExact()

java.lang.invoke.MethodHandle.invokeExact()
Invokes the method handle, allowing any caller type descriptor, but requiring an exact type match. The symbolic type descriptor at the call site of {@code invokeExact} mustexactly match this method handle's {@link #type type}. No conversions are allowed on arguments or return values.
When this method is observed via the Core Reflection API, it will appear as a single native method, taking an object array and returning an object. If this native method is invoked directly via {@link java.lang.reflect.Method#invoke java.lang.reflect.Method.invoke}, via JNI, or indirectly via {@link java.lang.invoke.MethodHandles.Lookup#unreflect Lookup.unreflect}, it will throw an {@code UnsupportedOperationException}. @param args the signature-polymorphic parameter list, statically represented using varargs @return the signature-polymorphic result, statically represented using {@code Object} @throws WrongMethodTypeException if the target's type is not identical with the caller's symbolic type descriptor @throws Throwable anything thrown by the underlying method propagates unchanged through the method handle call

        MethodHandle handle = Binder
                .from(String.class, String.class, String.class)
                .invokeStaticQuiet(LOOKUP, Subjects.class, "concatStatic");


        assertEquals(MethodType.methodType(String.class, String.class, String.class), handle.type());
        assertEquals("Hello, world", (String) handle.invokeExact("Hello, ", "world"));
    }


    @Test
    public void testInvokeVirtual() throws Throwable {
        MethodHandle handle = Binder

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        MethodHandle handle = Binder
                .from(String.class, BinderTest.class, String.class, String.class)
                .invokeVirtual(LOOKUP, "concatVirtual");


        assertEquals(MethodType.methodType(String.class, BinderTest.class, String.class, String.class), handle.type());
        assertEquals("Hello, world", (String) handle.invokeExact(this, "Hello, ", "world"));
    }


    @Test
    public void testInvokeVirtual2() throws Throwable {
        MethodHandle handle = Binder

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        MethodHandle handle = Binder
                .from(String.class, BinderTest.class, String.class, String.class)
                .invokeVirtualQuiet(LOOKUP, "concatVirtual");


        assertEquals(MethodType.methodType(String.class, BinderTest.class, String.class, String.class), handle.type());
        assertEquals("Hello, world", (String) handle.invokeExact(this, "Hello, ", "world"));
    }


    @Test
    public void testInvokeConstructor() throws Throwable {
        MethodHandle handle = Binder

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        MethodHandle handle = Binder
                .from(Constructable.class, String.class, String.class)
                .invokeConstructor(LOOKUP, Constructable.class);


        assertEquals(MethodType.methodType(Constructable.class, String.class, String.class), handle.type());
        assertEquals(new Constructable("foo", "bar"), (Constructable) handle.invokeExact("foo", "bar"));
    }


    @Test
    public void testInvokeConstructor2() throws Throwable {
        MethodHandle handle = Binder

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        MethodHandle handle = Binder
                .from(Constructable.class, String.class, String.class)
                .invokeConstructorQuiet(LOOKUP, Constructable.class);


        assertEquals(MethodType.methodType(Constructable.class, String.class, String.class), handle.type());
        assertEquals(new Constructable("foo", "bar"), (Constructable) handle.invokeExact("foo", "bar"));
    }


    @Test
    public void testGetField() throws Throwable {
        Fields fields = new Fields();

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        MethodHandle handle = Binder
                .from(String.class, Fields.class)
                .getField(LOOKUP, "instanceField");
        
        assertEquals(MethodType.methodType(String.class, Fields.class), handle.type());
        assertEquals("initial", (String)handle.invokeExact(fields));
    }


    @Test
    public void testGetField2() throws Throwable {
        Fields fields = new Fields();

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        MethodHandle handle = Binder
                .from(String.class, Fields.class)
                .getFieldQuiet(LOOKUP, "instanceField");


        assertEquals(MethodType.methodType(String.class, Fields.class), handle.type());
        assertEquals("initial", (String)handle.invokeExact(fields));
    }


    @Test
    public void testGetStatic() throws Throwable {
        MethodHandle handle = Binder

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        MethodHandle handle = Binder
                .from(String.class)
                .getStatic(LOOKUP, Fields.class, "staticField");


        assertEquals(MethodType.methodType(String.class), handle.type());
        assertEquals("initial", (String)handle.invokeExact());
    }


    @Test
    public void testGetStatic2() throws Throwable {
        MethodHandle handle = Binder

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        MethodHandle handle = Binder
                .from(String.class)
                .getStaticQuiet(LOOKUP, Fields.class, "staticField");


        assertEquals(MethodType.methodType(String.class), handle.type());
        assertEquals("initial", (String)handle.invokeExact());
    }


    @Test
    public void testSetField() throws Throwable {
        Fields fields = new Fields();

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        MethodHandle handle = Binder
                .from(void.class, Fields.class, String.class)
                .setField(LOOKUP, "instanceField");


        assertEquals(MethodType.methodType(void.class, Fields.class, String.class), handle.type());
        handle.invokeExact(fields, "modified");
        assertEquals("modified", fields.instanceField);
    }


    @Test
    public void testSetField2() throws Throwable {

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