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Commons Math example source code file (BigFractionFormatTest.java)

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

Java - Commons Math tags/keywords

bigdecimal, bigfraction, bigfraction, bigfractionformat, locale, math, numberformat, numberformat, override, parseexception, parseexception, properbigfractionformat, string, string, testcase, text, util

The Commons Math BigFractionFormatTest.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.math.fraction;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Locale;

import junit.framework.TestCase;

public class BigFractionFormatTest extends TestCase {

    BigFractionFormat properFormat = null;
    BigFractionFormat improperFormat = null;

    protected Locale getLocale() {
        return Locale.getDefault();
    }

    @Override
    protected void setUp() throws Exception {
        properFormat = BigFractionFormat.getProperInstance(getLocale());
        improperFormat = BigFractionFormat.getImproperInstance(getLocale());
    }

    public void testFormat() {
        BigFraction c = new BigFraction(1, 2);
        String expected = "1 / 2";

        String actual = properFormat.format(c);
        assertEquals(expected, actual);

        actual = improperFormat.format(c);
        assertEquals(expected, actual);
    }

    public void testFormatNegative() {
        BigFraction c = new BigFraction(-1, 2);
        String expected = "-1 / 2";

        String actual = properFormat.format(c);
        assertEquals(expected, actual);

        actual = improperFormat.format(c);
        assertEquals(expected, actual);
    }

    public void testFormatZero() {
        BigFraction c = new BigFraction(0, 1);
        String expected = "0 / 1";

        String actual = properFormat.format(c);
        assertEquals(expected, actual);

        actual = improperFormat.format(c);
        assertEquals(expected, actual);
    }

    public void testFormatImproper() {
        BigFraction c = new BigFraction(5, 3);

        String actual = properFormat.format(c);
        assertEquals("1 2 / 3", actual);

        actual = improperFormat.format(c);
        assertEquals("5 / 3", actual);
    }

    public void testFormatImproperNegative() {
        BigFraction c = new BigFraction(-5, 3);

        String actual = properFormat.format(c);
        assertEquals("-1 2 / 3", actual);

        actual = improperFormat.format(c);
        assertEquals("-5 / 3", actual);
    }

    public void testParse() {
        String source = "1 / 2";

        try {
            BigFraction c = properFormat.parse(source);
            assertNotNull(c);
            assertEquals(BigInteger.ONE, c.getNumerator());
            assertEquals(BigInteger.valueOf(2l), c.getDenominator());

            c = improperFormat.parse(source);
            assertNotNull(c);
            assertEquals(BigInteger.ONE, c.getNumerator());
            assertEquals(BigInteger.valueOf(2l), c.getDenominator());
        } catch (ParseException ex) {
            fail(ex.getMessage());
        }
    }

    public void testParseInteger() {
        String source = "10";
        try {
            BigFraction c = properFormat.parse(source);
            assertNotNull(c);
            assertEquals(BigInteger.TEN, c.getNumerator());
            assertEquals(BigInteger.ONE, c.getDenominator());
        } catch (ParseException ex) {
            fail(ex.getMessage());
        }
        try {
            BigFraction c = improperFormat.parse(source);
            assertNotNull(c);
            assertEquals(BigInteger.TEN, c.getNumerator());
            assertEquals(BigInteger.ONE, c.getDenominator());
        } catch (ParseException ex) {
            fail(ex.getMessage());
        }
    }

    public void testParseInvalid() {
        String source = "a";
        String msg = "should not be able to parse '10 / a'.";
        try {
            properFormat.parse(source);
            fail(msg);
        } catch (ParseException ex) {
            // success
        }
        try {
            improperFormat.parse(source);
            fail(msg);
        } catch (ParseException ex) {
            // success
        }
    }

    public void testParseInvalidDenominator() {
        String source = "10 / a";
        String msg = "should not be able to parse '10 / a'.";
        try {
            properFormat.parse(source);
            fail(msg);
        } catch (ParseException ex) {
            // success
        }
        try {
            improperFormat.parse(source);
            fail(msg);
        } catch (ParseException ex) {
            // success
        }
    }

    public void testParseNegative() {

        try {
            String source = "-1 / 2";
            BigFraction c = properFormat.parse(source);
            assertNotNull(c);
            assertEquals(-1, c.getNumeratorAsInt());
            assertEquals(2, c.getDenominatorAsInt());

            c = improperFormat.parse(source);
            assertNotNull(c);
            assertEquals(-1, c.getNumeratorAsInt());
            assertEquals(2, c.getDenominatorAsInt());

            source = "1 / -2";
            c = properFormat.parse(source);
            assertNotNull(c);
            assertEquals(-1, c.getNumeratorAsInt());
            assertEquals(2, c.getDenominatorAsInt());

            c = improperFormat.parse(source);
            assertNotNull(c);
            assertEquals(-1, c.getNumeratorAsInt());
            assertEquals(2, c.getDenominatorAsInt());
        } catch (ParseException ex) {
            fail(ex.getMessage());
        }
    }

    public void testParseProper() {
        String source = "1 2 / 3";

        try {
            BigFraction c = properFormat.parse(source);
            assertNotNull(c);
            assertEquals(5, c.getNumeratorAsInt());
            assertEquals(3, c.getDenominatorAsInt());
        } catch (ParseException ex) {
            fail(ex.getMessage());
        }

        try {
            improperFormat.parse(source);
            fail("invalid improper fraction.");
        } catch (ParseException ex) {
            // success
        }
    }

    public void testParseProperNegative() {
        String source = "-1 2 / 3";
        try {
            BigFraction c = properFormat.parse(source);
            assertNotNull(c);
            assertEquals(-5, c.getNumeratorAsInt());
            assertEquals(3, c.getDenominatorAsInt());
        } catch (ParseException ex) {
            fail(ex.getMessage());
        }

        try {
            improperFormat.parse(source);
            fail("invalid improper fraction.");
        } catch (ParseException ex) {
            // success
        }
    }

    public void testParseProperInvalidMinus() {
        String source = "2 -2 / 3";
        try {
            properFormat.parse(source);
            fail("invalid minus in improper fraction.");
        } catch (ParseException ex) {
            // expected
        }
        source = "2 2 / -3";
        try {
            properFormat.parse(source);
            fail("invalid minus in improper fraction.");
        } catch (ParseException ex) {
            // expected
        }
    }

    public void testParseBig() throws ParseException {
        BigFraction f1 =
            improperFormat.parse("167213075789791382630275400487886041651764456874403" +
                                 " / " +
                                 "53225575123090058458126718248444563466137046489291");
        assertEquals(Math.PI, f1.doubleValue(), 0.0);
        BigFraction f2 =
            properFormat.parse("3 " +
                               "7536350420521207255895245742552351253353317406530" +
                               " / " +
                               "53225575123090058458126718248444563466137046489291");
        assertEquals(Math.PI, f2.doubleValue(), 0.0);
        assertEquals(f1, f2);
        BigDecimal pi =
            new BigDecimal("3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117068");
        assertEquals(pi, f1.bigDecimalValue(99, BigDecimal.ROUND_HALF_EVEN));
    }

    public void testNumeratorFormat() {
        NumberFormat old = properFormat.getNumeratorFormat();
        NumberFormat nf = NumberFormat.getInstance();
        nf.setParseIntegerOnly(true);
        properFormat.setNumeratorFormat(nf);
        assertEquals(nf, properFormat.getNumeratorFormat());
        properFormat.setNumeratorFormat(old);

        old = improperFormat.getNumeratorFormat();
        nf = NumberFormat.getInstance();
        nf.setParseIntegerOnly(true);
        improperFormat.setNumeratorFormat(nf);
        assertEquals(nf, improperFormat.getNumeratorFormat());
        improperFormat.setNumeratorFormat(old);
    }

    public void testDenominatorFormat() {
        NumberFormat old = properFormat.getDenominatorFormat();
        NumberFormat nf = NumberFormat.getInstance();
        nf.setParseIntegerOnly(true);
        properFormat.setDenominatorFormat(nf);
        assertEquals(nf, properFormat.getDenominatorFormat());
        properFormat.setDenominatorFormat(old);

        old = improperFormat.getDenominatorFormat();
        nf = NumberFormat.getInstance();
        nf.setParseIntegerOnly(true);
        improperFormat.setDenominatorFormat(nf);
        assertEquals(nf, improperFormat.getDenominatorFormat());
        improperFormat.setDenominatorFormat(old);
    }

    public void testWholeFormat() {
        ProperBigFractionFormat format = (ProperBigFractionFormat)properFormat;

        NumberFormat old = format.getWholeFormat();
        NumberFormat nf = NumberFormat.getInstance();
        nf.setParseIntegerOnly(true);
        format.setWholeFormat(nf);
        assertEquals(nf, format.getWholeFormat());
        format.setWholeFormat(old);
    }

    public void testLongFormat() {
        assertEquals("10 / 1", improperFormat.format(10l));
    }

    public void testDoubleFormat() {
        assertEquals("1 / 16", improperFormat.format(0.0625));
    }
}

Other Commons Math examples (source code examples)

Here is a short list of links related to this Commons Math BigFractionFormatTest.java source code file:

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