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Java example source code file (FrequencyTest.java)

This example Java source code file (FrequencyTest.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

bufferedreader, expected, expecting, frequency, illegalargumentexception, integer, list, mathillegalargumentexception, one, string, test, tolerance, util

The FrequencyTest.java Java example 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.math3.stat;

import java.io.BufferedReader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;


import org.apache.commons.math3.TestUtils;
import org.apache.commons.math3.exception.MathIllegalArgumentException;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

/**
 * Test cases for the {@link Frequency} class.
 *
 */
public final class FrequencyTest {
    private static final long ONE_LONG = 1L;
    private static final long TWO_LONG = 2L;
    private static final long THREE_LONG = 3L;
    private static final int ONE = 1;
    private static final int TWO = 2;
    private static final int THREE = 3 ;
    private static final double TOLERANCE = 10E-15d;
    private static final char CHAR_A = 'a';

    private Frequency f = null;

    @Before
    public void setUp() {
        f = new Frequency();
    }

    /** test freq counts */
    @Test
    public void testCounts() {
        Assert.assertEquals("total count",0,f.getSumFreq());
        f.addValue(ONE_LONG);
        f.addValue(TWO_LONG);
        f.addValue(1);
        f.addValue(ONE);
        Assert.assertEquals("one frequency count",3,f.getCount(1));
        Assert.assertEquals("two frequency count",1,f.getCount(2));
        Assert.assertEquals("three frequency count",0,f.getCount(3));
        Assert.assertEquals("total count",4,f.getSumFreq());
        Assert.assertEquals("zero cumulative frequency", 0, f.getCumFreq(0));
        Assert.assertEquals("one cumulative frequency", 3,  f.getCumFreq(1));
        Assert.assertEquals("two cumulative frequency", 4,  f.getCumFreq(2));
        Assert.assertEquals("Integer argument cum freq",4, f.getCumFreq(Integer.valueOf(2)));
        Assert.assertEquals("five cumulative frequency", 4,  f.getCumFreq(5));
        Assert.assertEquals("foo cumulative frequency", 0,  f.getCumFreq("foo"));

        f.clear();
        Assert.assertEquals("total count",0,f.getSumFreq());

        // userguide examples -------------------------------------------------------------------
        f.addValue("one");
        f.addValue("One");
        f.addValue("oNe");
        f.addValue("Z");
        Assert.assertEquals("one cumulative frequency", 1 ,  f.getCount("one"));
        Assert.assertEquals("Z cumulative pct", 0.5,  f.getCumPct("Z"), TOLERANCE);
        Assert.assertEquals("z cumulative pct", 1.0,  f.getCumPct("z"), TOLERANCE);
        Assert.assertEquals("Ot cumulative pct", 0.25,  f.getCumPct("Ot"), TOLERANCE);
        f.clear();

        f = null;
        Frequency f = new Frequency();
        f.addValue(1);
        f.addValue(Integer.valueOf(1));
        f.addValue(Long.valueOf(1));
        f.addValue(2);
        f.addValue(Integer.valueOf(-1));
        Assert.assertEquals("1 count", 3, f.getCount(1));
        Assert.assertEquals("1 count", 3, f.getCount(Integer.valueOf(1)));
        Assert.assertEquals("0 cum pct", 0.2, f.getCumPct(0), TOLERANCE);
        Assert.assertEquals("1 pct", 0.6, f.getPct(Integer.valueOf(1)), TOLERANCE);
        Assert.assertEquals("-2 cum pct", 0, f.getCumPct(-2), TOLERANCE);
        Assert.assertEquals("10 cum pct", 1, f.getCumPct(10), TOLERANCE);

        f = null;
        f = new Frequency(String.CASE_INSENSITIVE_ORDER);
        f.addValue("one");
        f.addValue("One");
        f.addValue("oNe");
        f.addValue("Z");
        Assert.assertEquals("one count", 3 ,  f.getCount("one"));
        Assert.assertEquals("Z cumulative pct -- case insensitive", 1 ,  f.getCumPct("Z"), TOLERANCE);
        Assert.assertEquals("z cumulative pct -- case insensitive", 1 ,  f.getCumPct("z"), TOLERANCE);

        f = null;
        f = new Frequency();
        Assert.assertEquals(0L, f.getCount('a'));
        Assert.assertEquals(0L, f.getCumFreq('b'));
        TestUtils.assertEquals(Double.NaN, f.getPct('a'), 0.0);
        TestUtils.assertEquals(Double.NaN, f.getCumPct('b'), 0.0);
        f.addValue('a');
        f.addValue('b');
        f.addValue('c');
        f.addValue('d');
        Assert.assertEquals(1L, f.getCount('a'));
        Assert.assertEquals(2L, f.getCumFreq('b'));
        Assert.assertEquals(0.25, f.getPct('a'), 0.0);
        Assert.assertEquals(0.5, f.getCumPct('b'), 0.0);
        Assert.assertEquals(1.0, f.getCumPct('e'), 0.0);
    }

    /** test pcts */
    @Test
    public void testPcts() {
        f.addValue(ONE_LONG);
        f.addValue(TWO_LONG);
        f.addValue(ONE);
        f.addValue(TWO);
        f.addValue(THREE_LONG);
        f.addValue(THREE_LONG);
        f.addValue(3);
        f.addValue(THREE);
        Assert.assertEquals("one pct",0.25,f.getPct(1),TOLERANCE);
        Assert.assertEquals("two pct",0.25,f.getPct(Long.valueOf(2)),TOLERANCE);
        Assert.assertEquals("three pct",0.5,f.getPct(THREE_LONG),TOLERANCE);
        Assert.assertEquals("five pct",0,f.getPct(5),TOLERANCE);
        Assert.assertEquals("foo pct",0,f.getPct("foo"),TOLERANCE);
        Assert.assertEquals("one cum pct",0.25,f.getCumPct(1),TOLERANCE);
        Assert.assertEquals("two cum pct",0.50,f.getCumPct(Long.valueOf(2)),TOLERANCE);
        Assert.assertEquals("Integer argument",0.50,f.getCumPct(Integer.valueOf(2)),TOLERANCE);
        Assert.assertEquals("three cum pct",1.0,f.getCumPct(THREE_LONG),TOLERANCE);
        Assert.assertEquals("five cum pct",1.0,f.getCumPct(5),TOLERANCE);
        Assert.assertEquals("zero cum pct",0.0,f.getCumPct(0),TOLERANCE);
        Assert.assertEquals("foo cum pct",0,f.getCumPct("foo"),TOLERANCE);
    }

    /** test adding incomparable values */
    @Test
    public void testAdd() {
        char aChar = 'a';
        char bChar = 'b';
        String aString = "a";
        f.addValue(aChar);
        f.addValue(bChar);
        try {
            f.addValue(aString);
            Assert.fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }
        try {
            f.addValue(2);
            Assert.fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }
        Assert.assertEquals("a pct",0.5,f.getPct(aChar),TOLERANCE);
        Assert.assertEquals("b cum pct",1.0,f.getCumPct(bChar),TOLERANCE);
        Assert.assertEquals("a string pct",0.0,f.getPct(aString),TOLERANCE);
        Assert.assertEquals("a string cum pct",0.0,f.getCumPct(aString),TOLERANCE);

        f = new Frequency();
        f.addValue("One");
        try {
            f.addValue(new Integer("One"));
            Assert.fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }
    }

    /** test empty table */
    @Test
    public void testEmptyTable() {
        Assert.assertEquals("freq sum, empty table", 0, f.getSumFreq());
        Assert.assertEquals("count, empty table", 0, f.getCount(0));
        Assert.assertEquals("count, empty table",0, f.getCount(Integer.valueOf(0)));
        Assert.assertEquals("cum freq, empty table", 0, f.getCumFreq(0));
        Assert.assertEquals("cum freq, empty table", 0, f.getCumFreq("x"));
        Assert.assertTrue("pct, empty table", Double.isNaN(f.getPct(0)));
        Assert.assertTrue("pct, empty table", Double.isNaN(f.getPct(Integer.valueOf(0))));
        Assert.assertTrue("cum pct, empty table", Double.isNaN(f.getCumPct(0)));
        Assert.assertTrue("cum pct, empty table", Double.isNaN(f.getCumPct(Integer.valueOf(0))));
    }

    @Test
    public void testNonComparableCumPct() {
        f.addValue("a");
        Assert.assertEquals("cum freq, single entry", 1.0d, f.getCumPct("a"),TOLERANCE);
        Assert.assertEquals("cum freq, single entry non comparable", 0.0d, f.getCumPct(100),TOLERANCE);
    }

    @Test
    public void testNonComparablePct() {
        f.addValue("a");
        Assert.assertEquals("cum freq, single entry", 1.0d, f.getPct("a"),TOLERANCE);
        Assert.assertEquals("cum freq, single entry non comparable", 0.0d, f.getPct(100),TOLERANCE);
    }

    /**
     * Tests toString()
     */
    @Test
    public void testToString() throws Exception {
        f.addValue(ONE_LONG);
        f.addValue(TWO_LONG);
        f.addValue(ONE);
        f.addValue(TWO);

        String s = f.toString();
        //System.out.println(s);
        Assert.assertNotNull(s);
        BufferedReader reader = new BufferedReader(new StringReader(s));
        String line = reader.readLine(); // header line
        Assert.assertNotNull(line);

        line = reader.readLine(); // one's or two's line
        Assert.assertNotNull(line);

        line = reader.readLine(); // one's or two's line
        Assert.assertNotNull(line);

        line = reader.readLine(); // no more elements
        Assert.assertNull(line);
    }

    @Test
    public void testIntegerValues() {
        Comparable<?> obj1 = null;
        obj1 = Integer.valueOf(1);
        Integer int1 = Integer.valueOf(1);
        f.addValue(obj1);
        f.addValue(int1);
        f.addValue(2);
        f.addValue(Long.valueOf(2));
        Assert.assertEquals("Integer 1 count", 2, f.getCount(1));
        Assert.assertEquals("Integer 1 count", 2, f.getCount(Integer.valueOf(1)));
        Assert.assertEquals("Integer 1 count", 2, f.getCount(Long.valueOf(1)));
        Assert.assertEquals("Integer 1 cumPct", 0.5, f.getCumPct(1), TOLERANCE);
        Assert.assertEquals("Integer 1 cumPct", 0.5, f.getCumPct(Long.valueOf(1)), TOLERANCE);
        Assert.assertEquals("Integer 1 cumPct", 0.5, f.getCumPct(Integer.valueOf(1)), TOLERANCE);

        f.incrementValue(ONE, -2);
        f.incrementValue(THREE, 5);

        Assert.assertEquals("Integer 1 count", 0, f.getCount(1));
        Assert.assertEquals("Integer 3 count", 5, f.getCount(3));

        Iterator<?> it = f.valuesIterator();
        while (it.hasNext()) {
            Assert.assertTrue(it.next() instanceof Long);
        }
    }

    @Test
    public void testSerial() {
        f.addValue(ONE_LONG);
        f.addValue(TWO_LONG);
        f.addValue(ONE);
        f.addValue(TWO);
        Assert.assertEquals(f, TestUtils.serializeAndRecover(f));
    }

    @Test
    public void testGetUniqueCount() {
        Assert.assertEquals(0, f.getUniqueCount());
        f.addValue(ONE_LONG);
        Assert.assertEquals(1, f.getUniqueCount());
        f.addValue(ONE_LONG);
        Assert.assertEquals(1, f.getUniqueCount());
        f.addValue(TWO);
        Assert.assertEquals(2, f.getUniqueCount());
    }

    @Test
    public void testIncrement() {
        Assert.assertEquals(0, f.getUniqueCount());
        f.incrementValue(ONE_LONG, 1);
        Assert.assertEquals(1, f.getCount(ONE_LONG));

        f.incrementValue(ONE_LONG, 4);
        Assert.assertEquals(5, f.getCount(ONE_LONG));

        f.incrementValue(ONE_LONG, -5);
        Assert.assertEquals(0, f.getCount(ONE_LONG));

        try {
            f.incrementValue(CHAR_A, 1);
            Assert.fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }

        f = new Frequency();
        f.incrementValue(CHAR_A, 2);

        Assert.assertEquals(2, f.getCount(CHAR_A));

        try {
            f.incrementValue(ONE, 1);
            Assert.fail("Expecting IllegalArgumentException");
        } catch (IllegalArgumentException ex) {
            // expected
        }

        f.incrementValue(CHAR_A, 3);
        Assert.assertEquals(5, f.getCount(CHAR_A));

    }

    @Test
    public void testMerge() {
        Assert.assertEquals(0, f.getUniqueCount());
        f.addValue(ONE_LONG);
        f.addValue(TWO_LONG);
        f.addValue(ONE);
        f.addValue(TWO);

        Assert.assertEquals(2, f.getUniqueCount());
        Assert.assertEquals(2, f.getCount(ONE));
        Assert.assertEquals(2, f.getCount(TWO));

        Frequency g = new Frequency();
        g.addValue(ONE_LONG);
        g.addValue(THREE_LONG);
        g.addValue(THREE);

        Assert.assertEquals(2, g.getUniqueCount());
        Assert.assertEquals(1, g.getCount(ONE));
        Assert.assertEquals(2, g.getCount(THREE));

        f.merge(g);

        Assert.assertEquals(3, f.getUniqueCount());
        Assert.assertEquals(3, f.getCount(ONE));
        Assert.assertEquals(2, f.getCount(TWO));
        Assert.assertEquals(2, f.getCount(THREE));
    }

    @Test
    public void testMergeCollection() {
        Assert.assertEquals(0, f.getUniqueCount());
        f.addValue(ONE_LONG);

        Assert.assertEquals(1, f.getUniqueCount());
        Assert.assertEquals(1, f.getCount(ONE));
        Assert.assertEquals(0, f.getCount(TWO));

        Frequency g = new Frequency();
        g.addValue(TWO_LONG);

        Frequency h = new Frequency();
        h.addValue(THREE_LONG);

        List<Frequency> coll = new ArrayList();
        coll.add(g);
        coll.add(h);
        f.merge(coll);

        Assert.assertEquals(3, f.getUniqueCount());
        Assert.assertEquals(1, f.getCount(ONE));
        Assert.assertEquals(1, f.getCount(TWO));
        Assert.assertEquals(1, f.getCount(THREE));
    }

    @Test
    public void testMode() {
        List<Comparable mode;
        mode = f.getMode();
        Assert.assertEquals(0, mode.size());

        f.addValue("3");
        mode = f.getMode();
        Assert.assertEquals(1, mode.size());
        Assert.assertEquals("3", mode.get(0));

        f.addValue("2");
        mode = f.getMode();
        Assert.assertEquals(2, mode.size());
        Assert.assertEquals("2", mode.get(0));
        Assert.assertEquals("3",mode.get(1));

        f.addValue("2");
        mode = f.getMode();
        Assert.assertEquals(1, mode.size());
        Assert.assertEquals("2", mode.get(0));
        Assert.assertFalse(mode.contains("1"));
        Assert.assertTrue(mode.contains("2"));

        try {
            f.addValue(Double.valueOf(Double.NaN));
            Assert.fail("Expected MathIllegalArgumentException");
        } catch (MathIllegalArgumentException e) {
            // expected
        }
    }

    @Test
    public void testModeDoubleNan() {
        List<Comparable mode;
        f.addValue(Double.valueOf(Double.NaN));
        f.addValue(Double.valueOf(Double.NaN));
        f.addValue(Double.valueOf(Double.NaN));
        f.addValue(Double.valueOf(Double.NEGATIVE_INFINITY));
        f.addValue(Double.valueOf(Double.POSITIVE_INFINITY));
        f.addValue(Double.valueOf(Double.NEGATIVE_INFINITY));
        f.addValue(Double.valueOf(Double.POSITIVE_INFINITY));
        f.addValue(Double.valueOf(Double.NEGATIVE_INFINITY));
        f.addValue(Double.valueOf(Double.POSITIVE_INFINITY));
        mode = f.getMode();
        Assert.assertEquals(3, mode.size());
        Assert.assertEquals(Double.valueOf(Double.NEGATIVE_INFINITY), mode.get(0));
        Assert.assertEquals(Double.valueOf(Double.POSITIVE_INFINITY), mode.get(1));
        Assert.assertEquals(Double.valueOf(Double.NaN), mode.get(2));
        try {
            f.addValue(Float.valueOf(Float.NaN));
            Assert.fail("Expected MathIllegalArgumentException");
        } catch (MathIllegalArgumentException e) {
            // expected
        }
    }

    @Test
    public void testModeFloatNan() {
        List<Comparable mode;
        f.addValue(Float.valueOf(Float.NaN));
        f.addValue(Float.valueOf(Float.NaN));
        f.addValue(Float.valueOf(Float.NaN));
        f.addValue(Float.valueOf(Float.NEGATIVE_INFINITY));
        f.addValue(Float.valueOf(Float.POSITIVE_INFINITY));
        f.addValue(Float.valueOf(Float.NEGATIVE_INFINITY));
        f.addValue(Float.valueOf(Float.POSITIVE_INFINITY));
        f.addValue(Float.valueOf(Float.NEGATIVE_INFINITY));
        f.addValue(Float.valueOf(Float.POSITIVE_INFINITY));
        mode = f.getMode();
        Assert.assertEquals(3, mode.size());
        Assert.assertEquals(Float.valueOf(Float.NEGATIVE_INFINITY), mode.get(0));
        Assert.assertEquals(Float.valueOf(Float.POSITIVE_INFINITY), mode.get(1));
        Assert.assertEquals(Float.valueOf(Float.NaN), mode.get(2));
        try {
            f.addValue(Double.valueOf(Double.NaN));
            Assert.fail("Expected MathIllegalArgumentException");
        } catch (MathIllegalArgumentException e) {
            // expected
        }
    }

}

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