home | career | drupal | java | mac | mysql | perl | scala | uml | unix

Groovy example source code file (CastTest.groovy)

This example Groovy source code file (CastTest.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

array, character, hashset, integer, integer, set, set, short, short, sortedset, sortedset, string, strings, type

The Groovy CastTest.groovy source code

/*
 * Copyright 2003-2010 the original author or authors.
 *
 * Licensed 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 groovy

class CastTest extends GroovyTestCase {

    Short b = 1
    
    void testCast() {
        def x = (Short) 5

        println("Cast Integer to ${x} with type ${x.class}")
        
        assert x.class == Short
        
        methodWithShort(x)
    }
    
    void testImplicitCast() {
        Short x = 6
        
        println("Created ${x} with type ${x.class}")
        
        assert x.class == Short , "Type is ${x.class}"
        
        methodWithShort(x)
        
        x = 7
        
        println("Updated ${x} with type ${x.class}")
        
        assert x.class == Short , "Type is ${x.class}"
    }

    void testImplicitCastOfField() {

        println("Field is ${b} with type ${b.class}")
        
        assert b.class == Short , "Type is ${b.class}"
        
        b = 5
        
        println("Updated field ${b} with type ${b.class}")
 
        assert b.class == Short , "Type is ${b.class}"
    }
    
    void testIntCast() {
        def i = (Integer) 'x'
        
        assert i instanceof Integer
    }
    
    void testCharCompare() {
        def i = (Integer) 'x'
        def c = 'x'
        
        assert i == c
        assert i =='x'
        assert c == 'x'
        assert i == i
        assert c == c

        assert 'x' == 'x'
        assert 'x' == c
        assert 'x' == i
    }
    
    void testCharCast() {
        def c = (Character) 'x'
        
        assert c instanceof Character
        
        c = (Character)10
        
        assert c instanceof Character
    }
    
    void methodWithShort(Short s) {
        println("Called with ${s} with type ${s.class}")
        assert s.class == Short
    }
    
    void methodWithChar(Character x) {
        println("Called with ${x} with type ${s.class}")
        
        def text = "text"
        def idx = text.indexOf(x)
        
        assert idx == 2
    }
    // br
    void testPrimitiveCasting() {
        def d = 1.23
        def i1 = (int)d
        def i2 = (Integer)d
        assert i1.class.name == 'java.lang.Integer'
        assert i2.class.name == 'java.lang.Integer'

        def ch = (char) i1
        assert ch.class.name == 'java.lang.Character'

        def dd = (double)d
        assert dd.class.name == 'java.lang.Double'

    }

    void testAsSet() {
        def mySet = [2, 3, 4, 3] as SortedSet
        assert mySet instanceof SortedSet
        
        // identity test
        mySet = {} as SortedSet
        assert mySet.is ( mySet as SortedSet )
        
        mySet = [2, 3, 4, 3] as Set
        assert mySet instanceof HashSet
        
        // identitiy test
        mySet = {} as Set
        assert mySet.is ( mySet as Set )

        // array test
        mySet = new String[2] as Set // Array of 2 null Strings
        assert mySet instanceof Set
        assert mySet.size() == 1
        assert mySet.iterator().next() == null

        mySet = "a,b".split(",") as Set // Array of 2 different Strings
        assert mySet instanceof Set
        assert mySet.size() == 2
        assert mySet == new HashSet([ "a", "b" ])

        mySet = "a,a".split(",") as Set // Array of 2 different Strings
        assert mySet instanceof Set
        assert mySet.size() == 1
        assert mySet == new HashSet([ "a" ])
    }

    void testCastToAbstractClass() {
        def closure = { 42 }
        def myList = closure as AbstractList
        assert myList[-1] == 42
        assert myList.size() == 42
    }

    void testArrayCast() {
        def a = '1' as Integer
        assert [a, a.class] == [1, Integer]
        def b = '2' as int
        assert [b, b.class] == [2, Integer]
        def c = '100' as Integer
        assert [c, c.class] == [100, Integer]
        def d = '200' as int
        assert [d, d.class] == [200, Integer]
        def e = ['1', '2'] as Integer[]
        assert e == [1, 2]
        assert e.class.componentType == Integer
        def f = ['1', '2'] as int[]
        assert f == [1, 2]
        assert f.class.componentType == int
        def g = ['100', '200'] as Integer[]
        assert g == [100, 200]
        assert g.class.componentType == Integer
        def h = ['100', '200'] as int[]
        assert h == [100, 200]
        assert h.class.componentType == int
        
        def sa = [null,"1"] as String[]
        assert sa[0]==null
        assert sa[1]=="1"
        assert sa.class.componentType == String
    }
    
    void testCastString() {
        // this test must pass on 1.7.x
        // see GROOVY-3978, GROOVY-4657, GROOVY-4669
        def val = "abcde" as byte[]
        assert val == "abcde".bytes
    }

    void testCastEnum() {
        CastEnum val;
        val = 'value1'
        assert val == val.value1
        def i = 2
        val = "value$i"
        assert val == val.value2
    }

    enum CastEnum {
        value1,
        value2
    }
}

Other Groovy examples (source code examples)

Here is a short list of links related to this Groovy CastTest.groovy source code file:

new blog posts

 

Copyright 1998-2014 Alvin Alexander, alvinalexander.com
All Rights Reserved.