Java example source code file (AccessMethodsLHS.java)

This example Java source code file (AccessMethodsLHS.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

accessmethodslhs, bar, baz, doit, domore, exception, fail, quem, quux, string

The AccessMethodsLHS.java Java example source code

/*
 * Copyright (c) 1998, 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 4102566
 * @summary Test access methods for assignment targets.
 * @author William Maddox (maddox)
 *
 * @compile AccessMethodsLHS.java
 * @run main AccessMethodsLHS
 */

public class AccessMethodsLHS {

    static void fail(String msg) throws Exception {
        throw new Exception("FAIL: " + msg);
    }

    static int arg = 123456;

    private int i;
    private double d;

    private void m(int x) throws Exception {
        System.out.println("called AccessMethodsLHS.m");
        if (x != 123456)
            AccessMethodsLHS.fail("bad argument");
    }

    public static class Bar {
        private int i;
        private double d;
        private String s;

        private void m(int x) throws Exception {
            System.out.println("called AccessMethodsLHS.Bar.m");
            if (x != 123456)
                AccessMethodsLHS.fail("bad argument");
        }

        // Static members are permitted in a static inner class.

        static private int si;
        static private double sd;
        static private String ss;

        static private void sm(int x) throws Exception {
            System.out.println("called AccessMethodsLHS.Bar.sm");
            if (x != 123456)
                AccessMethodsLHS.fail("bad argument");
        }
    }

    public static class Baz {
        private int i;
        private double d;
        private String s;

        private void m(int x) throws Exception {
            System.out.println("called Baz.m");
            if (x != 123456)
                AccessMethodsLHS.fail("bad argument");
        }

        // Compiler rejects static members here correctly.

        // static private int si;
        // static private double sd;
        // static private String ss;
    }

    public class Quux {
        void DoIt () throws Exception {
            m(arg);
            i = 1;
            d = 1.0;
            i += 5;
            i--;
        }
        void DoMore(AccessMethodsLHS f) throws Exception {
            f.m(arg);
        }
    }

    public static class Quem {
        void DoIt () {
            // Illegal static refs to non-static vars
            // i = 1;
            // d = 1.0;
            // i += 5;
            // i--;
        }
    }

    static int effects = 0;

    static Bar iBar(Bar x) { effects++; return x; }

    static Baz iBaz(Baz x) { effects++; return x; }

    static void checkEffects(int i) throws Exception {
        if (effects != 1) {
            AccessMethodsLHS.fail("incorrect side-effect behavior (" + effects + "): " + i);
        }
        effects = 0;
    }

    static public void main(String args[]) throws Exception {

        Bar b = new Bar();
        Baz c = new Baz();

        System.out.println("testing assignment");

        AccessMethodsLHS f = new AccessMethodsLHS();

        Quux q1 = f.new Quux();
        q1.DoIt();
        q1.DoMore(f);

        Quem q2 = new Quem();
        q2.DoIt();

        // *** Static class, Non-static members ***

        b.m(arg);

        // Integer (1 word)

        b.i = 5;
        System.out.println(b.i);
        if (b.i != 5)
            AccessMethodsLHS.fail("simple assignment");
        System.out.println(b.i);


        if ((b.i += 10) != 15)
            AccessMethodsLHS.fail("add-assign result");
        System.out.println(b.i);

        if (b.i != 15)
            AccessMethodsLHS.fail("add-assign effect");
        System.out.println(b.i);

        b.s = "foo";
        if (!(b.s += "bar").equals("foobar"))
            AccessMethodsLHS.fail("concat-assign result");
        System.out.println(b.s);

        if (!b.s.equals("foobar"))
            AccessMethodsLHS.fail("concat-assign effect");
        System.out.println(b.s);

        b.s = "foo";
        b.s += "bar";
        if (!b.s.equals("foobar"))
            AccessMethodsLHS.fail("concat-assign effect (novalue)");
        System.out.println(b.s);

        b.i = 0;
        b.i++;
        if (b.i != 1)
            AccessMethodsLHS.fail("post-increment effect");
        System.out.println(b.i);

        b.i = 5;
        if (b.i++ != 5)
            AccessMethodsLHS.fail("post-increment result");
        if (b.i != 6)
            AccessMethodsLHS.fail("post-increment effect (embedded)");
        System.out.println(b.i);

        b.i = 1;
        --b.i;
        if (b.i != 0)
            AccessMethodsLHS.fail("pre-decrement effect");

        b.i = 5;
        if (--b.i != 4)
            AccessMethodsLHS.fail("pre-decrement result");
        if (b.i != 4)
            AccessMethodsLHS.fail("pre-decrement effect (embedded)");
        System.out.println(b.i);

        // Double (2 word)

        b.d = 5.0;
        System.out.println(b.d);
        if (b.d != 5.0)
            AccessMethodsLHS.fail("simple assignment");
        System.out.println(b.d);

        if ((b.d += 10) != 15.0)
            AccessMethodsLHS.fail("add-assign result");
        System.out.println(b.d);

        if (b.d != 15.0)
            AccessMethodsLHS.fail("add-assign effect");
        System.out.println(b.d);

        b.d = 0.0;
        b.d++;
        if (b.d != 1.0)
            AccessMethodsLHS.fail("post-increment effect");
        System.out.println(b.d);

        b.d = 5.0;
        if (b.d++ != 5.0)
            AccessMethodsLHS.fail("post-increment result");
        if (b.d != 6.0)
            AccessMethodsLHS.fail("post-increment effect (embedded)");
        System.out.println(b.d);

        b.d = 1.0;
        --b.d;
        if (b.d != 0.0)
            AccessMethodsLHS.fail("pre-decrement effect");

        b.d = 5.0;
        if (--b.d != 4.0)
            AccessMethodsLHS.fail("pre-decrement result");
        if (b.d != 4.0)
            AccessMethodsLHS.fail("pre-decrement effect (embedded)");
        System.out.println(b.d);

        // Integer (1 word) with side-effects in object reference

        iBar(b).i = 5;
        checkEffects(1);
        System.out.println(b.i);
        if (b.i != 5)
            AccessMethodsLHS.fail("simple assignment");

        System.out.println(b.i);

        if ((iBar(b).i += 10) != 15)
            AccessMethodsLHS.fail("add-assign result");
        checkEffects(2);
        System.out.println(b.i);

        if (b.i != 15)
            AccessMethodsLHS.fail("add-assign effect");
        System.out.println(b.i);

        b.i = 0;
        iBar(b).i++;
        checkEffects(3);
        if (b.i != 1)
            AccessMethodsLHS.fail("post-increment effect");
        System.out.println(b.i);

        b.i = 5;
        if (iBar(b).i++ != 5)
            AccessMethodsLHS.fail("post-increment result");
        checkEffects(4);
        if (b.i != 6)
            AccessMethodsLHS.fail("post-increment effect (embedded)");
        System.out.println(b.i);

        b.i = 1;
        --iBar(b).i;
        checkEffects(5);
        if (b.i != 0)
            AccessMethodsLHS.fail("pre-decrement effect");

        b.i = 5;
        if (--iBar(b).i != 4)
            AccessMethodsLHS.fail("pre-decrement result");
        checkEffects(6);
        if (b.i != 4)
            AccessMethodsLHS.fail("pre-decrement effect (embedded)");
        System.out.println(b.i);


        // *** Static class, Static members ***

        Bar.sm(arg);

        // Integer (1 word)

        Bar.si = 5;
        System.out.println(Bar.si);
        if (Bar.si != 5)
            AccessMethodsLHS.fail("simple assignment");
        System.out.println(Bar.si);

        if ((Bar.si += 10) != 15)
            AccessMethodsLHS.fail("add-assign result");
        System.out.println(Bar.si);

        if (Bar.si != 15)
            AccessMethodsLHS.fail("add-assign effect");
        System.out.println(Bar.si);

        Bar.ss = "foo";
        if (!(Bar.ss += "bar").equals("foobar"))
            AccessMethodsLHS.fail("concat-assign result");
        System.out.println(Bar.ss);

        if (!Bar.ss.equals("foobar"))
            AccessMethodsLHS.fail("concat-assign effect");
        System.out.println(Bar.ss);

        Bar.ss = "foo";
        Bar.ss += "bar";
        if (!Bar.ss.equals("foobar"))
            AccessMethodsLHS.fail("concat-assign effect (novalue)");
        System.out.println(Bar.ss);

        Bar.si = 0;
        Bar.si++;
        if (Bar.si != 1)
            AccessMethodsLHS.fail("post-increment effect");
        System.out.println(Bar.si);

        Bar.si = 5;
        if (Bar.si++ != 5)
            AccessMethodsLHS.fail("post-increment result");
        if (Bar.si != 6)
            AccessMethodsLHS.fail("post-increment effect (embedded)");
        System.out.println(Bar.si);

        Bar.si = 1;
        --Bar.si;
        if (Bar.si != 0)
            AccessMethodsLHS.fail("pre-decrement effect");

        Bar.si = 5;
        if (--Bar.si != 4)
            AccessMethodsLHS.fail("pre-decrement result");
        if (Bar.si != 4)
            AccessMethodsLHS.fail("pre-decrement effect (embedded)");
        System.out.println(Bar.si);

        // Double (2 word)

        Bar.sd = 5.0;
        System.out.println(Bar.sd);
        if (Bar.sd != 5.0)
            AccessMethodsLHS.fail("simple assignment");
        System.out.println(Bar.sd);

        if ((Bar.sd += 10) != 15.0)
            AccessMethodsLHS.fail("add-assign result");
        System.out.println(Bar.sd);

        if (Bar.sd != 15.0)
            AccessMethodsLHS.fail("add-assign effect");
        System.out.println(Bar.sd);

        Bar.sd = 0.0;
        Bar.sd++;
        if (Bar.sd != 1.0)
            AccessMethodsLHS.fail("post-increment effect");
        System.out.println(Bar.sd);

        Bar.sd = 5.0;
        if (Bar.sd++ != 5.0)
            AccessMethodsLHS.fail("post-increment result");
        if (Bar.sd != 6.0)
            AccessMethodsLHS.fail("post-increment effect (embedded)");
        System.out.println(Bar.sd);

        Bar.sd = 1.0;
        --Bar.sd;
        if (Bar.sd != 0.0)
            AccessMethodsLHS.fail("pre-decrement effect");

        Bar.sd = 5.0;
        if (--Bar.sd != 4.0)
            AccessMethodsLHS.fail("pre-decrement result");
        if (Bar.sd != 4.0)
            AccessMethodsLHS.fail("pre-decrement effect (embedded)");
        System.out.println(Bar.sd);


        // *** Static class, Static members (invoked via object reference) ***

        b.sm(arg);

        iBar(b).sm(arg);
        checkEffects(101);

        // Integer (1 word)

        b.si = 5;
        System.out.println(b.si);
        if (b.si != 5)
            AccessMethodsLHS.fail("simple assignment");
        System.out.println(b.si);

        if ((b.si += 10) != 15)
            AccessMethodsLHS.fail("add-assign result");
        System.out.println(b.si);

        if (b.si != 15)
            AccessMethodsLHS.fail("add-assign effect");
        System.out.println(b.si);

        b.ss = "foo";
        if (!(b.ss += "bar").equals("foobar"))
            AccessMethodsLHS.fail("concat-assign result");
        System.out.println(b.ss);

        if (!b.ss.equals("foobar"))
            AccessMethodsLHS.fail("concat-assign effect");
        System.out.println(b.ss);

        b.ss = "foo";
        b.ss += "bar";
        if (!b.ss.equals("foobar"))
            AccessMethodsLHS.fail("concat-assign effect (novalue)");
        System.out.println(b.ss);

        b.si = 0;
        b.si++;
        if (b.si != 1)
            AccessMethodsLHS.fail("post-increment effect");
        System.out.println(b.si);

        b.si = 5;
        if (b.si++ != 5)
            AccessMethodsLHS.fail("post-increment result");
        if (b.si != 6)
            AccessMethodsLHS.fail("post-increment effect (embedded)");
        System.out.println(b.si);

        b.si = 1;
        --b.si;
        if (b.si != 0)
            AccessMethodsLHS.fail("pre-decrement effect");

        b.si = 5;
        if (--b.si != 4)
            AccessMethodsLHS.fail("pre-decrement result");
        if (b.si != 4)
            AccessMethodsLHS.fail("pre-decrement effect (embedded)");
        System.out.println(b.si);

        // Double (2 word)

        b.sd = 5.0;
        System.out.println(b.sd);
        if (b.sd != 5.0)
            AccessMethodsLHS.fail("simple assignment");
        System.out.println(b.sd);

        if ((b.sd += 10) != 15.0)
            AccessMethodsLHS.fail("add-assign result");
        System.out.println(b.sd);

        if (b.sd != 15.0)
            AccessMethodsLHS.fail("add-assign effect");
        System.out.println(b.sd);

        b.sd = 0.0;
        b.sd++;
        if (b.sd != 1.0)
            AccessMethodsLHS.fail("post-increment effect");
        System.out.println(b.sd);

        b.sd = 5.0;
        if (b.sd++ != 5.0)
            AccessMethodsLHS.fail("post-increment result");
        if (b.sd != 6.0)
            AccessMethodsLHS.fail("post-increment effect (embedded)");
        System.out.println(b.sd);

        b.sd = 1.0;
        --b.sd;
        if (b.sd != 0.0)
            AccessMethodsLHS.fail("pre-decrement effect");

        b.sd = 5.0;
        if (--b.sd != 4.0)
            AccessMethodsLHS.fail("pre-decrement result");
        if (b.sd != 4.0)
            AccessMethodsLHS.fail("pre-decrement effect (embedded)");
        System.out.println(b.sd);

        // Integer (1 word) with side-effects in object reference

        iBar(b).si = 5;
        checkEffects(7);
        System.out.println(b.si);
        if (b.si != 5)
            AccessMethodsLHS.fail("simple assignment");
        System.out.println(b.si);

        if ((iBar(b).si += 10) != 15)
            AccessMethodsLHS.fail("add-assign result");
        checkEffects(8);
        System.out.println(b.si);

        if (b.si != 15)
            AccessMethodsLHS.fail("add-assign effect");
        System.out.println(b.si);

        iBar(b).si = 0;
        checkEffects(9);
        iBar(b).si++;
        checkEffects(10);
        if (b.si != 1)
            AccessMethodsLHS.fail("post-increment effect");
        System.out.println(b.si);

        b.si = 5;
        if (iBar(b).si++ != 5)
            AccessMethodsLHS.fail("post-increment result");
        checkEffects(11);
        if (b.si != 6)
            AccessMethodsLHS.fail("post-increment effect (embedded)");
        System.out.println(b.si);

        b.si = 1;
        --iBar(b).si;
        checkEffects(12);
        if (b.si != 0)
            AccessMethodsLHS.fail("pre-decrement effect");

        b.si = 5;
        if (--iBar(b).si != 4)
            AccessMethodsLHS.fail("pre-decrement result");
        checkEffects(13);
        if (b.si != 4)
            AccessMethodsLHS.fail("pre-decrement effect (embedded)");
        System.out.println(b.si);


        // *** Non-static class, Non-static members ***

        c.m(arg);

        iBaz(c).m(arg);
        checkEffects(102);

        // Integer (1 word)

        c.i = 5;
        System.out.println(c.i);
        if (c.i != 5)
            AccessMethodsLHS.fail("simple assignment");
        System.out.println(c.i);

        if ((c.i += 10) != 15)
            AccessMethodsLHS.fail("add-assign result");
        System.out.println(c.i);

        if (c.i != 15)
            AccessMethodsLHS.fail("add-assign effect");
        System.out.println(c.i);

        c.s = "foo";
        if (!(c.s += "bar").equals("foobar"))
            AccessMethodsLHS.fail("concat-assign result");
        System.out.println(c.s);

        if (!c.s.equals("foobar"))
            AccessMethodsLHS.fail("concat-assign effect");
        System.out.println(c.s);

        c.s = "foo";
        c.s += "bar";
        if (!c.s.equals("foobar"))
            AccessMethodsLHS.fail("concat-assign effect (novalue)");
        System.out.println(c.s);

        c.i = 0;
        c.i++;
        if (c.i != 1)
            AccessMethodsLHS.fail("post-increment effect");
        System.out.println(c.i);

        c.i = 5;
        if (c.i++ != 5)
            AccessMethodsLHS.fail("post-increment result");
        if (c.i != 6)
            AccessMethodsLHS.fail("post-increment effect (embedded)");
        System.out.println(c.i);

        c.i = 1;
        --c.i;
        if (c.i != 0)
            AccessMethodsLHS.fail("pre-decrement effect");

        c.i = 5;
        if (--c.i != 4)
            AccessMethodsLHS.fail("pre-decrement result");
        if (c.i != 4)
            AccessMethodsLHS.fail("pre-decrement effect (embedded)");
        System.out.println(c.i);

        // Double (2 word)

        c.d = 5.0;
        System.out.println(c.d);
        if (c.d != 5.0)
            AccessMethodsLHS.fail("simple assignment");
        System.out.println(c.d);

        if ((c.d += 10) != 15.0)
            AccessMethodsLHS.fail("add-assign result");
        System.out.println(c.d);

        if (c.d != 15.0)
            AccessMethodsLHS.fail("add-assign effect");
        System.out.println(c.d);

        c.d = 0.0;
        c.d++;
        if (c.d != 1.0)
            AccessMethodsLHS.fail("post-increment effect");
        System.out.println(c.d);

        c.d = 5.0;
        if (c.d++ != 5.0)
            AccessMethodsLHS.fail("post-increment result");
        if (c.d != 6.0)
            AccessMethodsLHS.fail("post-increment effect (embedded)");
        System.out.println(c.d);

        c.d = 1.0;
        --c.d;
        if (c.d != 0.0)
            AccessMethodsLHS.fail("pre-decrement effect");

        c.d = 5.0;
        if (--c.d != 4.0)
            AccessMethodsLHS.fail("pre-decrement result");
        if (c.d != 4.0)
            AccessMethodsLHS.fail("pre-decrement effect (embedded)");
        System.out.println(c.d);

        // Double (2 word) with side-effects in object reference

        iBaz(c).d = 5.0;
        checkEffects(14);
        System.out.println(c.d);
        if (c.d != 5.0)
            AccessMethodsLHS.fail("simple assignment");
        System.out.println(c.d);

        if ((iBaz(c).d += 10) != 15.0)
            AccessMethodsLHS.fail("add-assign result");
        checkEffects(15);
        System.out.println(c.d);

        if (c.d != 15.0)
            AccessMethodsLHS.fail("add-assign effect");
        System.out.println(c.d);

        c.d = 0.0;
        iBaz(c).d++;
        checkEffects(16);
        if (c.d != 1.0)
            AccessMethodsLHS.fail("post-increment effect");
        System.out.println(c.d);

        c.d = 5.0;
        if (iBaz(c).d++ != 5.0)
            AccessMethodsLHS.fail("post-increment result");
        checkEffects(17);
        if (c.d != 6.0)
            AccessMethodsLHS.fail("post-increment effect (embedded)");
        System.out.println(c.d);

        c.d = 1.0;
        --iBaz(c).d;
        checkEffects(18);
        if (c.d != 0.0)
            AccessMethodsLHS.fail("pre-decrement effect");

        c.d = 5.0;
        if (--iBaz(c).d != 4.0)
            AccessMethodsLHS.fail("pre-decrement result");
        checkEffects(19);
        if (c.d != 4.0)
            AccessMethodsLHS.fail("pre-decrement effect (embedded)");
        System.out.println(c.d);

        // All done.

        System.out.println("done");
    }
}