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Groovy example source code file (NumberMathTest.groovy)

This example Groovy source code file (NumberMathTest.groovy) 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 - Groovy tags/keywords

bd, bd, bi, bigdecimal, bigdecimal, biginteger, d, double, double, f, f, i, integer, l

The Groovy NumberMathTest.groovy source code

package groovy

import junit.framework.Assert

/** 
 * Basic NumberMath test.
 * @see org.codehaus.groovy.runtime.typehandling.NumberMath
 */
class NumberMathTest extends GroovyTestCase {

    void testPromotions() {
        def C = '1'.toCharacter()
        def B = new Byte("1")
        def I = new Integer(1)
        def L = new Long(1)
        def F = new Float("1.0")
        def D = new Double("1.0")
        def BI = new BigInteger("1")
        def BD = new BigDecimal("1.0")

        //+, -, and * all promote the same way, so sample the matrix
        assert C + B instanceof Integer
        assert C - BD instanceof BigDecimal
        assert B + C instanceof Integer
        assert B + I instanceof Integer
        assert B + F instanceof Double

        assert I + I instanceof Integer
        assert I - F instanceof Double
        assert I * D instanceof Double
        assert I + BI instanceof BigInteger
        assert I - BD instanceof BigDecimal

        assert F * L instanceof Double
        assert D + L instanceof Double
        assert BI - L instanceof BigInteger
        assert BD * L instanceof BigDecimal

        assert F + F instanceof Double
        assert F - BI instanceof Double
        assert F * BD instanceof Double

        assert F + D instanceof Double
        assert BI - D instanceof Double
        assert BD * D instanceof Double

        assert BI + BI instanceof BigInteger
        assert BD - BI instanceof BigDecimal
        assert BD * BD instanceof BigDecimal

        //Division (/) promotes differently so change the expected results:
        assert I / I instanceof BigDecimal
        assert I / F instanceof Double
        assert I / D instanceof Double
        assert I / BI instanceof BigDecimal
        assert I / BD instanceof BigDecimal

        assert F / L instanceof Double
        assert D / L instanceof Double
        assert BI / L instanceof BigDecimal
        assert BD / L instanceof BigDecimal

        assert F / F instanceof Double
        assert F / BI instanceof Double
        assert F / BD instanceof Double

        assert F / D instanceof Double
        assert BI / D instanceof Double
        assert BD / D instanceof Double

        assert BI / BI instanceof BigDecimal
        assert BD / BI instanceof BigDecimal
        assert BD / BD instanceof BigDecimal
    }

    void testOperations() {
        def I1 = new Integer(1)
        def I2 = new Integer(2)
        def I3 = new Integer(3)
        def L1 = new Long(1)
        def L2 = new Long(2)
        def L3 = new Long(3)
        def F1 = new Float("1.0")
        def F2 = new Float("2.0")
        def D1 = new Double("1.0")
        def D2 = new Double("2.0")
        def BI1 = new BigInteger("1")
        def BI2 = new BigInteger("2")
        def BD1 = new BigDecimal("1.0")
        def BD2 = new BigDecimal("2.0")
        def BD20 = new BigDecimal("2.00")

        assert I1 / I2 instanceof BigDecimal
        assert I1 / I2 == new BigDecimal("0.5")
        assert F1 / F2 instanceof Double
        Assert.assertEquals F1 / F2, 0.5, 0.0000000001
        assert D1 / D2 instanceof Double
        Assert.assertEquals D1 / D2, 0.5, 0.0000000001

        assert I1.intdiv(I2) instanceof Integer
        assert I1.intdiv(I2) == 0

        assert I3.intdiv(I2) instanceof Integer
        assert I3.intdiv(I2) == 1

        assert L1.intdiv(I2) instanceof Long
        assert L1.intdiv(I2) == 0

        assert L3.intdiv(L2) instanceof Long
        assert L3.intdiv(L2) == 1

        assert BI1.intdiv(BI2) instanceof BigInteger
        assert BI1.intdiv(BI2) == 0

        assert I1 / I3 instanceof BigDecimal
        assert I1 / I3 == new BigDecimal("0.3333333333")

        assert I2 / I3 instanceof BigDecimal
        assert I2 / I3 == new BigDecimal("0.6666666667")

        assert I1 / BD2 instanceof BigDecimal

        //Test keeping max scale of (L, R or 10)
        def BBD1 = new BigDecimal("0.12345678901234567")
        assert BD1 + BBD1 == new BigDecimal("1.12345678901234567")

        def BBD2 = new BigDecimal(".000000000000000008")
        assert BBD1 + BBD2 == new BigDecimal("0.123456789012345678")
    }

    void testUnsupportedIntDivision() {
        try {
            1.0.intdiv(3)
        } catch (UnsupportedOperationException uoe) {
            return
        }
        fail("Should catch an UnsupportedOperationException")

        try {
            1.0G.intdiv(3)
        } catch (UnsupportedOperationException uoe) {
            return
        }
        fail("Should catch an UnsupportedOperationException")
    }

    void testGetMath() {
        assert 20 == new Short("10") << 1
        assert 2 == new Byte("1") << 1
    }
    
    void testLongDivAssign() {
        long d = 100L
        d /= 33L
        assert d.class == Long.class
    }
    
    void testIntegerPlusCastException() {
        shouldFail(ClassCastException) {
           Integer i = 12
           i += " angry men"
        }
    }
}

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