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Groovy example source code file (ArrayCoerceTest.groovy)

This example Groovy source code file (ArrayCoerceTest.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

boolean, byte, character, character, double, float, groovytestcase, integer, integer, long, long, object, object, short

The Groovy ArrayCoerceTest.groovy source code

package groovy

class ArrayCoerceTest extends GroovyTestCase {

    Object[] field
    Long[] numberField
    int[] primitiveField

    void testStaticallyTypedPrimitiveTypeArrays() {
        int[] a = [1, 2, 3]
        assert a instanceof int[]
        assert a.length == 3
        dump(a)
    }

    void testStaticallyTypedPrimitiveFieldArrays() {
        primitiveField = [1, 2, 3]
        dump(primitiveField)

        assert primitiveField instanceof int[]
        assert primitiveField.length == 3
    }


    void testFoo2() {
        def x = [1, 2, 3] as Object[]
        dump(x)
        assert x instanceof Object[]
        def c = x.getClass()
        def et = c.componentType
        assert et == Object.class
    }

    void testStaticallyTypedObjectArrays() {
        Object[] b = [1, 2, 3]
        dump(b)

        assert b instanceof Object[]
        assert b.length == 3
        def c = b.getClass()
        def et = c.componentType
        assert et == Object.class

    }

    void testStaticallyTypedArrays() {
        Integer[] b = [1, 2, 3]
        dump(b)

        assert b instanceof Integer[]
        assert b.length == 3
        def c = b.getClass()
        def et = c.componentType
        assert et == Integer.class

    }

    void testStaticallyTypedObjectFieldArrays() {
        field = [1, 2, 3]
        dump(field)

        assert field instanceof Object[]
        assert field.length == 3
    }

    void testStaticallyTypedFieldArrays() {
        numberField = [1, 2, 3]
        dump(numberField)

        assert numberField instanceof Long[]
        assert numberField.length == 3
    }

    void testMakePrimitiveArrayTypes() {
        def x = null

        x = [1, 0, 1] as boolean[]
        assert x instanceof boolean[]
        assert x.length == 3
        dump(x)

        x = [1, 2, 3] as byte[]
        assert x.length == 3
        assert x instanceof byte[]
        dump(x)

        x = [1, 2, 3] as char[]
        assert x.length == 3
        assert x instanceof char[]
        dump(x)

        x = [1, 2, 3] as short[]
        assert x.length == 3
        assert x instanceof short[]
        dump(x)

        x = [1, 2, 3] as int[]
        assert x.length == 3
        assert x instanceof int[]
        dump(x)

        x = [1, 2, 3] as long[]
        assert x.length == 3
        assert x instanceof long[]
        dump(x)

        x = [1, 2, 3] as float[]
        assert x.length == 3
        assert x instanceof float[]
        dump(x)

        x = [1, 2, 3] as double[]
        assert x.length == 3
        assert x instanceof double[]
        dump(x)
    }



    void testAsObjectArray() {
        def x = [1, 2, 3] as Object[]
        def c = x.getClass()
        def et = c.componentType
        assert et == Object.class
        dump(x)

        Integer[] y = [1, 2, 3]
        c = y.getClass()
        et = c.componentType
        assert et == Integer.class
        dump(y)
    }

    void testMakeArrayThenCoerceToAnotherType() {
        def x = [1, 2, 3] as int[]
        assert x.size() == 3
        assert x instanceof int[]
        dump(x)

        // lets try coerce it into an array of longs
        def y = x as long[]
        assert y instanceof long[]
        dump(y)

        def z = y as Object[]
        assert z instanceof Object[]
        def c = z.getClass()
        def et = c.componentType
        assert et == Object.class
        dump(z)

        x = y as int[]
        assert x.size() == 3
        assert x instanceof int[]
        dump(x)
    }


    void testMakeArrayTypes() {
        def x = null

        x = [1, 0, 1] as Boolean[]
        assert x instanceof Boolean[]
        assert x.length == 3
        dump(x)

        x = [1, 2, 3] as Byte[]
        assert x.length == 3
        assert x instanceof Byte[]
        dump(x)

        x = [1, 2, 3] as Character[]
        assert x.length == 3
        assert x instanceof Character[]
        dump(x)

        x = [1, 2, 3] as Short[]
        assert x.length == 3
        assert x instanceof Short[]
        dump(x)

        x = [1, 2, 3] as Integer[]
        assert x.length == 3
        assert x instanceof Integer[]
        dump(x)

        x = [1, 2, 3] as Long[]
        assert x.length == 3
        assert x instanceof Long[]
        dump(x)

        x = [1, 2, 3] as Float[]
        assert x.length == 3
        assert x instanceof Float[]
        dump(x)

        x = [1, 2, 3] as Double[]
        assert x.length == 3
        assert x instanceof Double[]
        dump(x)
    }

    void dump(array) {
        println "Array is of type ${array.class} which has element type ${array.class.componentType}"
        for (i in array) {
            println "Contains entry $i of type ${i.class}"
        }
        println()
    }

}

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