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Java example source code file (MutableFloatTest.java)

This example Java source code file (MutableFloatTest.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.

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Java - Java tags/keywords

mutablefloat, mutablefloattest, test

The MutableFloatTest.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.lang3.mutable;

import org.junit.Test;
import static org.junit.Assert.*;

/**
 * JUnit tests.
 * 
 * @see MutableFloat
 */
public class MutableFloatTest {

    // ----------------------------------------------------------------
    @Test
    public void testConstructors() {
        assertEquals(0f, new MutableFloat().floatValue(), 0.0001f);
        
        assertEquals(1f, new MutableFloat(1f).floatValue(), 0.0001f);
        
        assertEquals(2f, new MutableFloat(Float.valueOf(2f)).floatValue(), 0.0001f);
        assertEquals(3f, new MutableFloat(new MutableFloat(3f)).floatValue(), 0.0001f);

        assertEquals(2f, new MutableFloat("2.0").floatValue(), 0.0001f);

    }

    @Test(expected=NullPointerException.class)
    public void testConstructorNull() {
        new MutableFloat((Number)null);
    }

    @Test
    public void testGetSet() {
        final MutableFloat mutNum = new MutableFloat(0f);
        assertEquals(0f, new MutableFloat().floatValue(), 0.0001f);
        assertEquals(Float.valueOf(0), new MutableFloat().getValue());
        
        mutNum.setValue(1);
        assertEquals(1f, mutNum.floatValue(), 0.0001f);
        assertEquals(Float.valueOf(1f), mutNum.getValue());
        
        mutNum.setValue(Float.valueOf(2f));
        assertEquals(2f, mutNum.floatValue(), 0.0001f);
        assertEquals(Float.valueOf(2f), mutNum.getValue());
        
        mutNum.setValue(new MutableFloat(3f));
        assertEquals(3f, mutNum.floatValue(), 0.0001f);
        assertEquals(Float.valueOf(3f), mutNum.getValue());
    }

    @Test(expected=NullPointerException.class)
    public void testSetNull() {
        final MutableFloat mutNum = new MutableFloat(0f);
        mutNum.setValue(null);
    }

    @Test
    public void testNanInfinite() {
        MutableFloat mutNum = new MutableFloat(Float.NaN);
        assertTrue(mutNum.isNaN());
        
        mutNum = new MutableFloat(Float.POSITIVE_INFINITY);
        assertTrue(mutNum.isInfinite());
        
        mutNum = new MutableFloat(Float.NEGATIVE_INFINITY);
        assertTrue(mutNum.isInfinite());
    }

    @Test
    public void testEquals() {
        final MutableFloat mutNumA = new MutableFloat(0f);
        final MutableFloat mutNumB = new MutableFloat(0f);
        final MutableFloat mutNumC = new MutableFloat(1f);

        assertTrue(mutNumA.equals(mutNumA));
        assertTrue(mutNumA.equals(mutNumB));
        assertTrue(mutNumB.equals(mutNumA));
        assertTrue(mutNumB.equals(mutNumB));
        assertFalse(mutNumA.equals(mutNumC));
        assertFalse(mutNumB.equals(mutNumC));
        assertTrue(mutNumC.equals(mutNumC));
        assertFalse(mutNumA.equals(null));
        assertFalse(mutNumA.equals(Float.valueOf(0f)));
        assertFalse(mutNumA.equals("0"));
    }

    @Test
    public void testHashCode() {
        final MutableFloat mutNumA = new MutableFloat(0f);
        final MutableFloat mutNumB = new MutableFloat(0f);
        final MutableFloat mutNumC = new MutableFloat(1f);

        assertTrue(mutNumA.hashCode() == mutNumA.hashCode());
        assertTrue(mutNumA.hashCode() == mutNumB.hashCode());
        assertFalse(mutNumA.hashCode() == mutNumC.hashCode());
        assertTrue(mutNumA.hashCode() == Float.valueOf(0f).hashCode());
    }

    @Test
    public void testCompareTo() {
        final MutableFloat mutNum = new MutableFloat(0f);

        assertEquals(0, mutNum.compareTo(new MutableFloat(0f)));
        assertEquals(+1, mutNum.compareTo(new MutableFloat(-1f)));
        assertEquals(-1, mutNum.compareTo(new MutableFloat(1f)));
    }

    @Test(expected=NullPointerException.class)
    public void testCompareToNull() {
        final MutableFloat mutNum = new MutableFloat(0f);
        mutNum.compareTo(null);
    }

    @Test
    public void testPrimitiveValues() {
        final MutableFloat mutNum = new MutableFloat(1.7F);
        
        assertEquals( 1, mutNum.intValue() );
        assertEquals( 1.7, mutNum.doubleValue(), 0.00001 );
        assertEquals( (byte) 1, mutNum.byteValue() );
        assertEquals( (short) 1, mutNum.shortValue() );
        assertEquals( 1, mutNum.intValue() );
        assertEquals( 1L, mutNum.longValue() );
    }

    @Test
    public void testToFloat() {
        assertEquals(Float.valueOf(0f), new MutableFloat(0f).toFloat());
        assertEquals(Float.valueOf(12.3f), new MutableFloat(12.3f).toFloat());
    }

    @Test
    public void testIncrement() {
        final MutableFloat mutNum = new MutableFloat(1);
        mutNum.increment();
        
        assertEquals(2, mutNum.intValue());
        assertEquals(2L, mutNum.longValue());
    }

    @Test
    public void testIncrementAndGet() {
        final MutableFloat mutNum = new MutableFloat(1f);
        float result = mutNum.incrementAndGet();

        assertEquals(2f, result, 0.01f);
        assertEquals(2, mutNum.intValue());
        assertEquals(2L, mutNum.longValue());
    }

    @Test
    public void testGetAndIncrement() {
        final MutableFloat mutNum = new MutableFloat(1f);
        float result = mutNum.getAndIncrement();

        assertEquals(1f, result, 0.01f);
        assertEquals(2, mutNum.intValue());
        assertEquals(2L, mutNum.longValue());
    }

    @Test
    public void testDecrement() {
        final MutableFloat mutNum = new MutableFloat(1);
        mutNum.decrement();
        
        assertEquals(0, mutNum.intValue());
        assertEquals(0L, mutNum.longValue());
    }

    @Test
    public void testDecrementAndGet() {
        final MutableFloat mutNum = new MutableFloat(1f);
        float result = mutNum.decrementAndGet();

        assertEquals(0f, result, 0.01f);
        assertEquals(0, mutNum.intValue());
        assertEquals(0L, mutNum.longValue());
    }

    @Test
    public void testGetAndDecrement() {
        final MutableFloat mutNum = new MutableFloat(1f);
        float result = mutNum.getAndDecrement();

        assertEquals(1f, result, 0.01f);
        assertEquals(0, mutNum.intValue());
        assertEquals(0L, mutNum.longValue());
    }

    @Test
    public void testAddValuePrimitive() {
        final MutableFloat mutNum = new MutableFloat(1);
        mutNum.add(1.1f);
        
        assertEquals(2.1f, mutNum.floatValue(), 0.01f);
    }

    @Test
    public void testAddValueObject() {
        final MutableFloat mutNum = new MutableFloat(1);
        mutNum.add(Float.valueOf(1.1f));
        
        assertEquals(2.1f, mutNum.floatValue(), 0.01f);
    }

    @Test
    public void testGetAndAddValuePrimitive() {
        final MutableFloat mutableFloat = new MutableFloat(1.25f);
        float result = mutableFloat.getAndAdd(0.75f);

        assertEquals(1.25f, result, 0.01f);
        assertEquals(2f, mutableFloat.floatValue(), 0.01f);
    }

    @Test
    public void testGetAndAddValueObject() {
        final MutableFloat mutableFloat = new MutableFloat(7.75f);
        float result = mutableFloat.getAndAdd(Float.valueOf(2.25f));

        assertEquals(7.75f, result, 0.01f);
        assertEquals(10f, mutableFloat.floatValue(), 0.01f);
    }

    @Test
    public void testAddAndGetValuePrimitive() {
        final MutableFloat mutableFloat = new MutableFloat(0.5f);
        float result = mutableFloat.addAndGet(1f);

        assertEquals(1.5f, result, 0.01f);
        assertEquals(1.5f, mutableFloat.floatValue(), 0.01f);
    }

    @Test
    public void testAddAndGetValueObject() {
        final MutableFloat mutableFloat = new MutableFloat(5f);
        float result = mutableFloat.addAndGet(Float.valueOf(2.5f));

        assertEquals(7.5f, result, 0.01f);
        assertEquals(7.5f, mutableFloat.floatValue(), 0.01f);
    }

    @Test
    public void testSubtractValuePrimitive() {
        final MutableFloat mutNum = new MutableFloat(1);
        mutNum.subtract(0.9f);
        
        assertEquals(0.1f, mutNum.floatValue(), 0.01f);
    }

    @Test
    public void testSubtractValueObject() {
        final MutableFloat mutNum = new MutableFloat(1);
        mutNum.subtract(Float.valueOf(0.9f));
        
        assertEquals(0.1f, mutNum.floatValue(), 0.01f);
    }

    @Test
    public void testToString() {
        assertEquals("0.0", new MutableFloat(0f).toString());
        assertEquals("10.0", new MutableFloat(10f).toString());
        assertEquals("-123.0", new MutableFloat(-123f).toString());
    }

}

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