Java example source code file (TestN1.java)

This example Java source code file (TestN1.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

class, inner1, inner2, inner3, reflection, type, typevariable

The TestN1.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 TestN1.java
* @run main/othervm -ea TestN1
*/


import java.lang.reflect.*;


class N1<T1, T2> {

    public Inner1 i1;
    public Inner2 i2;
    public Inner2<? super Character> i2sc;

    public class Inner1 {

    }

    public class Inner2<T1> {
        public boolean x;
        public byte b;
        public short s;
        public char c;
        public int i;
        public long l;
        public float f;
        public double d;

        public boolean[] xa;
        public byte[] ba;
        public short[] sa;
        public char[] ca;
        public int[] ia;
        public long[] la;
        public float[] fa;
        public double[] da;
    }

    public class Inner3<X1, X2, X3> {
        X1 x1;

        Inner3(X1 x1, X2 x2, X3 x3, T1 t1, T2 t2) {}

        <T, R, S> Inner3(T t, R r, S s, X1 x1) {}

        int shazam(boolean b, short s, int[] ia, Object[] oa, Inner1 i1,
                   Inner1 i1a, InnerInner<String,
                   Inner3<Object, String, Object[]>> ii)
        { return 3;}

        public class InnerInner<T2, X2> {

            boolean b;
            Inner2<X2> i2x;

            void foo(X3 x3){}
            <X3> X3[] bar(X1 x1, X3[] x3, T1 t1) { return x3;}
            N1<X1, X2> baz(N1 n1) { return n1;}
            N1<?, ?> bam(N1 n1) { return n1;}
            N1<? extends T1, ?> boom(N1 n1) { return n1;}

        }

    }




}


public class TestN1 {

    static Class<N1> cls = N1.class;


    public static void main(String[] args) throws Throwable {
        testTypeParameters();
        testInner1();
        testInner2();
        testInner3();
    }


    static void testTypeParameters() {

        System.out.println("testing type parameters");
        TypeVariable[] tvs = cls.getTypeParameters();
        assert
            tvs.length == 2 :
            "N1 should have two type parameters";
    }


    static void testInner1() {
        System.out.println("testing non-generic inner class");
        Class in1 = N1.Inner1.class;

        TypeVariable[] tvs = in1.getTypeParameters();
        assert
            tvs.length == 0 :
            "N1.Inner2 should have no type parameters";

    }

    static void testInner2() throws NoSuchFieldException {
        System.out.println("testing generic inner class 1");
        Class in1 = N1.Inner2.class;

        TypeVariable[] tvs = in1.getTypeParameters();
        assert
            tvs.length == 1 :
            "N1.Inner2 should have one type parameter";


        assert
            in1.getField("x").getGenericType() == boolean.class :
            "Type of Inner2.x should be boolean";

        assert
            in1.getField("b").getGenericType() == byte.class :
            "Type of Inner2.b should be byte";
        assert
            in1.getField("s").getGenericType() == short.class :
            "Type of Inner2.s should be short";
        assert
            in1.getField("c").getGenericType() == char.class :
            "Type of Inner2.x should be char";
        assert
            in1.getField("i").getGenericType() == int.class :
            "Type of Inner2.i should be int";
        assert
            in1.getField("l").getGenericType() == long.class :
            "Type of Inner2.l should be long";
        assert
            in1.getField("f").getGenericType() == float.class :
            "Type of Inner2.f should be float";
        assert
            in1.getField("d").getGenericType() == double.class :
            "Type of Inner2.d should be double";

        assert
            in1.getField("xa").getGenericType() == boolean[].class :
            "Type of Inner2.xa should be boolean[]";

        assert
            in1.getField("ba").getGenericType() == byte[].class :
            "Type of Inner2.ba should be byte[]";
        assert
            in1.getField("sa").getGenericType() == short[].class :
            "Type of Inner2.sa should be short[]";
        assert
            in1.getField("ca").getGenericType() == char[].class :
            "Type of Inner2.xa should be char[]";
        assert
            in1.getField("ia").getGenericType() == int[].class :
            "Type of Inner2.ia should be int[]";
        assert
            in1.getField("la").getGenericType() == long[].class :
            "Type of Inner2.la should be long[]";
        assert
            in1.getField("fa").getGenericType() == float[].class :
            "Type of Inner2.fa should be float[]";
        assert
            in1.getField("da").getGenericType() == double[].class :
            "Type of Inner2.da should be double[]";
    }


    static void testInner3() {
        System.out.println("testing generic inner class 3");
        Class in1 = N1.Inner3.class;

        TypeVariable[] tvs = in1.getTypeParameters();
        assert
            tvs.length == 3 :
            "N1.Inner2 should have three type parameters";
    }
}