Groovy example source code file (TernaryOperatorsTest.groovy)

This example Groovy source code file (TernaryOperatorsTest.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, integer, integer, ternaryoperatorstest, ternaryoperatorstest

The Groovy TernaryOperatorsTest.groovy source code

package groovy.operator

class TernaryOperatorsTest extends GroovyTestCase {

    void testSimpleUse() {
        def y = 5

        def x = (y > 1) ? "worked" : "failed"
        assert x == "worked"


        x = (y < 4) ? "failed" : "worked"
        assert x == "worked"
    }

    void testUseInParameterCalling() {
        def z = 123
        assertCalledWithFoo(z > 100 ? "foo" : "bar")
        assertCalledWithFoo(z < 100 ? "bar" : "foo")
       }

    def assertCalledWithFoo(param) {
        println "called with param ${param}"
        assert param == "foo"
    }
    
    void testWithBoolean(){
        def a = 1
        def x = a!=null ? a!=2 : a!=1
        assert x == true
        def y = a!=1 ? a!=2 : a!=1
        assert y == false
    }
    
    void testElvisOperator() {
        def a = 1
        def x = a?:2
        assert x==a
        
        a = null
        x = a?:2
        assert x==2
        
        def list = ['a','b','c']
        def index = 0
        def ret = list[index++]?:"something else"
        assert index==1
        assert ret=='a'
    }
    
    void testForType() {
        boolean b = false
        int anInt = b ? 100 : 100 / 3
        assert anInt.class == Integer
    }
    
    void testBytecodeRegisters() {
        // this code will blow up if the true and false parts
        // are not handled correctly in regards to the registers.
        def i = 1
        def c= { false? { i } : it == i }
        assert true
    }

    void testLineBreaks() {
        def bar = 0 ? "moo" : "cow"
        assert bar == 'cow'

        bar = 0 ?
            "moo" : "cow"
        assert bar == 'cow'

        bar = 0 ? "moo" :
            "cow"
        assert bar == 'cow'

        bar = 0 ?
            "moo" :
            "cow"
        assert bar == 'cow'

        bar = 0 ? "moo"         \
              : "cow"
        assert bar == 'cow'

        // This used to fail
        bar = 0 ? "moo"
                : "cow"
        assert bar == 'cow'
    }
}