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The TestC2.java Java example source code
/*
* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4891872
* @summary Some tests for the generic core reflection api.
* @author Gilad Bracha
* @compile TestC2.java
* @run main/othervm -ea TestC2
*/
import java.lang.reflect.*;
abstract class C0<T> {
public T ft;
public C0<T> fc1t;
public C0 fc1;
public C0(){}
public C0(T t) {}
public abstract C0<T> mc1t(T t, C0 c1t, C0 c1);
public abstract C0 mc1();
public abstract T mt(T t);
}
interface I1<X1, X2> extends I3 {
X1 foo(X2 x2);
}
interface I2<E1, E2 extends Throwable, E3> {
E1 bar(E3 e3) throws E2;
}
interface I3 {
}
abstract class C2<T1 extends C2,
T3 extends Throwable>
extends C0<T1>
implements I1<T1, T2>, I2, I3
{
public T1 ft;
public C0<String> fc1t;
public C0 fc1;
public int fi;
public C2(T2 t2) {}
public <T> C2(T t) {}
public <T1, T2, T3, T4> C2(T1 t1, T2 t2, T4 t4) {}
public C2() throws T3 {}
public abstract <T> C0 mc1t(T3 t3, C0 c1t, C0 c1);
public abstract <E, R> C0 mc1(E e);
public abstract T1 mt(T2 t);
}
public class TestC2 {
static Class<C2> cls = C2.class;
public static void main(String[] args) throws Throwable {
testSuperclass();
testSuperInterfaces();
testTypeParameters();
testMethods();
testConstructors();
testFields();
}
static void testSuperclass() {
System.out.println("testing superclass");
Type sc = cls.getGenericSuperclass();
assert
sc instanceof ParameterizedType :
"Superclass of C2 should be a parameterized type";
ParameterizedType psc = (ParameterizedType) sc;
assert
((psc.getRawType() == C0.class) ) :
"The raw generic superclass of C2 should be C0";
Type[] tas = psc.getActualTypeArguments();
assert
tas.length == 1 :
"Superclass of C2 should have one type argument";
Type t = tas[0];
assert
t instanceof TypeVariable :
"Type argument to superclass of C2 should be a type variable";
TypeVariable tv = (TypeVariable) t;
assert
tv.getName().equals("T1") :
"Name of type argument to superclass of C2 should be T1";
Type[] bs = tv.getBounds();
assert
bs.length == 1 :
"T1 has one bound (superclass)";
t = bs[0];
assert
t instanceof ParameterizedType :
"Bound of C0 should be a parameterized type";
ParameterizedType pt = (ParameterizedType) t;
assert
((pt.getRawType() == C2.class) ) :
"The raw bound of T1 should be C2";
tas = pt.getActualTypeArguments();
assert
tas.length == 3 :
"Bound of T1 should have three type arguments";
assert
tas[0] instanceof TypeVariable :
"First argument to bound of T1 is a type variable";
assert
tas[1] instanceof TypeVariable :
"Second argument to bound of T1 is a type variable";
assert
tas[2] instanceof TypeVariable :
"Third argument to bound of T1 is a type variable";
TypeVariable tv1 = (TypeVariable) tas[0];
TypeVariable tv2 = (TypeVariable) tas[1];
TypeVariable tv3 = (TypeVariable) tas[2];
assert
tv1.getName().equals("T1"):
"First type arg to bound of T1 is T1";
assert
tv2.getName().equals("T2"):
"Seconmd type arg to bound of T1 is T2";
assert
tv3.getName().equals("T3"):
"Third type arg to bound of T1 is T3";
}
static void testSuperInterfaces() {
System.out.println("testing superinterfaces");
Type[] sis = cls.getGenericInterfaces();
assert
((sis.length == 3)):
"C2 should have three generic superinterfaces";
Type t = sis[0];
assert
t instanceof ParameterizedType :
"First superinterface of C2 should be a parameterized type";
ParameterizedType pt = (ParameterizedType) t;
assert
pt.getRawType() == I1.class :
"First super interface of C2 is instantiation of I1";
Type[] tas = pt.getActualTypeArguments();
assert
tas.length == 2 :
"First super interface of C2 has 2 type arguments";
t = sis[1];
assert
t instanceof ParameterizedType :
"Second superinterface of C2 should be a parameterized type";
pt = (ParameterizedType) t;
assert
pt.getRawType() == I2.class :
"Second super interface of C2 is instantiation of I2";
tas = pt.getActualTypeArguments();
assert
tas.length == 3 :
"Second super interface of C2 has 3 type arguments";
t = sis[2];
assert
t == I3.class :
"Third superinterface of C2 is I3";
// Test interfaces themselves
TypeVariable[] tvs = I1.class.getTypeParameters();
assert
tvs.length == 2 :
"I3 has two formal type parameters";
assert
tvs[0].getName().equals("X1") :
"Name of first formal type arg of I1 is X1";
assert
tvs[1].getName().equals("X2") :
"Name of second formal type arg of I1 is X2";
assert
I1.class.getGenericSuperclass() == I1.class.getSuperclass() :
"The generic and non-generic superclasses of an interface must be the same";
sis = I1.class.getGenericInterfaces();
assert
sis.length == 1 :
"I1 has one generic superinterface";
assert
sis[0] == I3.class :
"Superinterface of I1 is I3";
tvs = I2.class.getTypeParameters();
assert
tvs.length == 3 :
"I3 has three formal type parameters";
assert
tvs[0].getName().equals("E1") :
"Name of first formal type arg of I2 is E1";
assert
tvs[1].getName().equals("E2") :
"Name of second formal type arg of I2 is E2";
assert
tvs[2].getName().equals("E3") :
"Name of third formal type arg of I2 is E3";
assert
I2.class.getGenericSuperclass() == I2.class.getSuperclass() :
"The generic and non-generic superclasses of an interface must be the same";
tvs = I3.class.getTypeParameters();
assert
tvs.length == 0 :
"I3 has no formal type parameters";
assert
I3.class.getGenericSuperclass() == I3.class.getSuperclass() :
"The generic and non-generic superclasses of an interface must be the same";
}
static void testTypeParameters() {
System.out.println("testing type parameters");
TypeVariable[] tvs = cls.getTypeParameters();
assert
tvs.length == 3 :
"C2 should have three type parameters";
TypeVariable tv = tvs[0];
Type[] bs = tv.getBounds();
assert
bs.length == 1 :
"T1 should have one bound";
assert
bs[0] instanceof ParameterizedType :
"The bound of T1 should be a parameterized type";
tv = tvs[1];
bs = tv.getBounds();
assert
bs.length == 1 :
"T2 should have one bound";
assert
bs[0] instanceof ParameterizedType :
"The bound of T2 should be a parameterized type";
tv = tvs[2];
bs = tv.getBounds();
assert
bs.length == 1 :
"T3 should have one bound";
assert
bs[0] == Throwable.class :
"The bound of T3 should be Throwable";
}
static void testMethods() throws NoSuchMethodException {
System.out.println("testing methods");
Class[] params1 = new Class[3];
params1[0] = Throwable.class;
params1[1] = C0.class;
params1[2] = C0.class;
Class[] params2 = new Class[1];
params2[0] = Object.class;
Class[] params3 = new Class[1];
params3[0] = C0.class;
Method mc1t = cls.getMethod("mc1t", params1);
Method mc1 = cls.getMethod("mc1", params2);
Method mt = cls.getMethod("mt", params3);
Type rt_mc1t = mc1t.getGenericReturnType();
assert
rt_mc1t instanceof ParameterizedType :
"The return type of mc1t should be a parameterized type";
ParameterizedType pt = (ParameterizedType) rt_mc1t;
assert
pt.getRawType() == C0.class :
"The raw return type of mc1t should be C0";
Type[] tas = pt.getActualTypeArguments();
assert
tas.length == 1 :
"Return type of mc1t should have one type argument";
assert
tas[0] instanceof TypeVariable :
"Type argument of return type of mc1t is a type variable";
Type rt_mc1 = mc1.getGenericReturnType();
assert
rt_mc1 == C0.class :
"Return type of mc1 is C0";
Type rt_mt = mt.getGenericReturnType();
assert
rt_mt instanceof TypeVariable :
"Return type of mt is a type variable";
Type[] pt_mc1t = mc1t.getGenericParameterTypes();
assert
pt_mc1t.length == 3 :
"C0.mc1t has three parameters";
Type p1_mc1t = pt_mc1t[0];
assert p1_mc1t != null;
assert
p1_mc1t instanceof TypeVariable :
"Generic type of the 1st parameter of mc1t(T) is a type variable";
TypeVariable tv = (TypeVariable) p1_mc1t;
assert
tv.getName().equals("T3") :
"Name of 1st type parameter of mc1t is T3, not " + tv.getName();
Type[] bs = tv.getBounds();
assert
bs.length == 1 :
"T3 should have one bound (mc1t)";
assert
bs[0] == Throwable.class :
"The bound of T3 should be Throwable(mc1t)";
Type p2_mc1t = pt_mc1t[1];
assert
p2_mc1t instanceof ParameterizedType :
"The type of parameter 2 of mc1t is a parameterized type";
pt = (ParameterizedType) p2_mc1t;
assert
pt.getRawType() == C0.class :
"Type of parameter 2 of mc1t is instantiation of C0";
assert
pt.getOwnerType() == null :
"Type of parameter 2 of mc1t is has null owner";
tas = pt.getActualTypeArguments();
assert
tas.length == 1 :
"The type of parameter 2 of mc1t has one type argument";
Type ta = tas[0];
assert
ta instanceof TypeVariable :
"The actual type arg of C0<T> is a type variable (mc1t)";
tv = (TypeVariable) ta;
assert
tv.getName().equals("T") :
"mc1t: Name of the type arg of C0<T> is T, not " + tv.getName();
bs = tv.getBounds();
assert
bs.length == 1 :
"mc1t: The type argument of C0<T> should have one bound";
assert
bs[0] == Object.class :
"mc1t: The bound of the type arg of C0<T> should be Object";
Type p3_mc1t = pt_mc1t[2];
assert
p3_mc1t == C0.class :
"Type of parameter 3 of mc1t is C0";
Type[] pt_mc1 = mc1.getGenericParameterTypes();
assert
pt_mc1.length == 1 :
"C2.mc1 has one parameter";
Type[] pt_mt = mt.getGenericParameterTypes();
assert
pt_mt.length == 1 :
"C2.mt has one parameter";
Type p_mt = pt_mt[0];
assert
p_mt instanceof TypeVariable :
"The generic type of the parameter of mt(T) is a type variable";
tv = (TypeVariable) p_mt;
assert
tv.getName().equals("T2") :
"The name of the type parameter of mt is T2, not " + tv.getName();
bs = tv.getBounds();
assert
bs.length == 1 :
"T2 should have one bound";
assert
bs[0] instanceof ParameterizedType:
"The bound of T2 should be parameterized type";
Type[] et_mc1t = mc1t.getGenericExceptionTypes();
assert
et_mc1t.length == 0 :
"Method C0.mc1t should have no generic exception types";
Type[] et_mc1 = mc1.getGenericExceptionTypes();
assert
et_mc1.length == 0 :
"Method C0.mc1 should have no generic exception types";
Type[] et_mt = mt.getGenericExceptionTypes();
assert
et_mt.length == 0 :
"Method C0.mt should have no generic exception types";
TypeVariable[] tv_mc1t = mc1t.getTypeParameters();
assert
tv_mc1t.length == 1 :
"Method C2.mc1t should have one type parameter";
TypeVariable[] tv_mc1 = mc1.getTypeParameters();
assert
tv_mc1.length == 2 :
"Method C2.mc1 should have two type parameters";
TypeVariable[] tv_mt = mt.getTypeParameters();
assert
tv_mt.length == 0 :
"Method C2.mt should have no type parameters";
}
static void testFields() throws NoSuchFieldException{
System.out.println("testing fields");
Field ft = cls. getField("ft");
Field fc1t = cls. getField("fc1t");
Field fc1 = cls. getField("fc1");
Field fi = cls. getField("fi");
Type gt_ft = ft.getGenericType();
assert
gt_ft instanceof TypeVariable :
"The generic type of C0.ft is a type variable";
TypeVariable tv = (TypeVariable) gt_ft;
assert
tv.getName().equals("T1") :
"The name of the type of ft is T1, not " + tv.getName();
Type[] bs = tv.getBounds();
assert
bs.length == 1 :
"The type of ft should have one bound";
Type gt_fc1t = fc1t.getGenericType();
assert
gt_fc1t instanceof ParameterizedType :
"The generic type of C0.fc1t is a parameterized type";
ParameterizedType pt = (ParameterizedType) gt_fc1t;
assert
pt.getRawType() == C0.class :
"Type of C2.fc1t is an instantiation of C0";
assert
pt.getOwnerType() == null :
"Type of C2.fc1t is has null owner";
Type[] tas = pt.getActualTypeArguments();
assert
tas.length == 1 :
"The type of fc1t has one type argument";
Type ta = tas[0];
assert
ta == String.class :
"The actual type arg of C0<String> is String";
Type gt_fc1 = fc1.getGenericType();
assert
gt_fc1 == C0.class :
" Type of C2.fc1 should be C0";
Type gt_fi = fi.getGenericType();
assert
gt_fi == int.class:
" Type of C2.fi should be int";
}
static void testConstructors() throws NoSuchMethodException {
System.out.println("testing constructors");
Class[] params1 = new Class[1];
params1[0] = C0.class;
Constructor<C2> con = cls.getDeclaredConstructor(params1);
Type[] pt_con = con.getGenericParameterTypes();
assert
pt_con.length == 1 :
"Constructor C0(T) should have one generic parameter type";
Type pt = pt_con[0];
assert
pt instanceof TypeVariable :
"The generic type of the parameter of C0(T2) is a type variable";
TypeVariable tv = (TypeVariable) pt;
assert
tv.getName().equals("T2") :
"The name of the type parameter of C2 is T2, not " + tv.getName();
Type[] bs = tv.getBounds();
assert
bs.length == 1 :
"T should have one bound";
Type[] et_con = con.getGenericExceptionTypes();
assert
et_con.length == 0 :
"Constructor C2(T2) should have no generic exception types";
TypeVariable[] tv_con = con.getTypeParameters();
assert
tv_con.length == 0 :
"Constructor C2(T2) should have no type parameters";
Class[] params2 = new Class[1];
params2[0] = Object.class;
con = cls.getDeclaredConstructor(params2);
pt_con = con.getGenericParameterTypes();
assert
pt_con.length == 1 :
"Constructor C0(T) should have one generic parameter type";
pt = pt_con[0];
assert
pt instanceof TypeVariable :
"The generic type of the parameter of C2(T) is a type variable";
tv = (TypeVariable) pt;
assert
tv.getName().equals("T") :
"The name of the type parameter of C2 is T, not " + tv.getName();
bs = tv.getBounds();
assert
bs.length == 1 :
"T should have one bound";
et_con = con.getGenericExceptionTypes();
assert
et_con.length == 0 :
"Constructor C2(T) should have no generic exception types";
tv_con = con.getTypeParameters();
assert
tv_con.length == 1 :
"Constructor C2(T) should have one type parameter";
Class[] params3 = new Class[3];
params3[0] = Object.class;
params3[1] = Object.class;
params3[2] = Object.class;
con = cls.getDeclaredConstructor(params3);
pt_con = con.getGenericParameterTypes();
assert
pt_con.length == 3 :
"Constructor C2(T1,T2,T4) should have three generic parameter types";
pt = pt_con[0];
assert
pt instanceof TypeVariable :
"The generic type of the first parameter of C2(T1,T2,T4) is a type variable";
tv = (TypeVariable) pt;
assert
tv.getName().equals("T1") :
"The name of the type parameter of C2(T1,T2,T4) is T1, not " + tv.getName();
bs = tv.getBounds();
assert
bs.length == 1 :
"T should have one bound";
et_con = con.getGenericExceptionTypes();
assert
et_con.length == 0 :
"Constructor C2(T1,T2,T4) should have no generic exception types";
tv_con = con.getTypeParameters();
assert
tv_con.length == 4 :
"Constructor C2(T1,T2,T4) should have four type parameters";
Class[] params4 = new Class[0];
con = cls.getDeclaredConstructor(params4);
pt_con = con.getGenericParameterTypes();
assert
pt_con.length == 0 :
"Constructor C2() should have no generic parameter types";
et_con = con.getGenericExceptionTypes();
assert
et_con.length == 1 :
"Constructor C2() should have one generic exception type";
tv_con = con.getTypeParameters();
assert
tv_con.length == 0 :
"Constructor C2() should have no type parameters";
}
}
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