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Groovy example source code file (PrefixTest.groovy)

This example Groovy source code file (PrefixTest.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

groovytestcase, groovytestcase, prefixtest, prefixtest

The Groovy PrefixTest.groovy source code

package groovy

class PrefixTest extends GroovyTestCase {

    void testIntegerPrefix() {
        def x = 1
        
        def y = ++x
        
        assert y == 2
        assert x == 2
        
        assert ++x == 3
    }
    
    void testDoublePrefix() {
        def x = 1.2
        def y = ++x
        
        assert y == 2.2
        assert x == 2.2
        assert ++x == 3.2
        assert x == 3.2
    }

    void testStringPrefix() {
        def x = "bbc"
        ++x
        
        assert x == "bbd"
        
        --x
        --x
        
        assert x == "bbb"

        def y = ++"bbc"
        assert y == "bbd"
    }
    
    void testArrayPrefix() {
        int[] i = [1]
        
        ++i[0]
        assert i[0] == 2
        
        --i[0]
        --i[0]
        assert i[0] == 0
    }
    
    void testConstantPostFix() {
        assert 2 == ++1
    }

    def valueReturned() { 0 }

    void testFunctionPostfix() {
        def z = ++(valueReturned())

        assert z == 1
    }

    void testPrefixAndPostfix() {
        def u = 0
        
        assert -1 == -- u --
        assert 0 == ++ u ++
        assert -2 == (--(--u))
        assert -1 == u
    }
}

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