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Groovy example source code file (AbstractClassAndInterfaceTest.groovy)

This example Groovy source code file (AbstractClassAndInterfaceTest.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

a, a, b, b, c, c, foo, groovyshell, i, methodthree, object, object, string, xxx

The Groovy AbstractClassAndInterfaceTest.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

import gls.CompilableTestSupport

class AbstractClassAndInterfaceTest extends CompilableTestSupport {

    void testInterface() {
        def shell = new GroovyShell()
        def text = """
            interface A {
                void methodOne(Object o)
                Object methodTwo()
            }
            
            class B implements A {
                void methodOne(Object o){assert true}
                Object methodTwo(){
                    assert true
                    methodOne(null)
                    return new Object()
                }
            }
            
            def b = new B();
            return b.methodTwo()
            """
        def retVal = shell.evaluate(text)
        assert retVal.class == Object
    }

    void testClassImplementingAnInterfaceButMissesMethod() {
        shouldNotCompile """
            interface A {
                void methodOne(Object o)
                Object methodTwo()
            }
            
            class B implements A {
                void methodOne(Object o){assert true}
            }
            
            def b = new B();
            return b.methodTwo()
            """
        
        shouldNotCompile """
            interface A {
                Object methodTwo()
            }
            interface B extends A{
                void methodOne(Object o)
            }
            
            class C implements A {
                void methodOne(Object o){assert true}
            }
            
            def b = new C();
            return b.methodTwo()
            """
    }

    void testClassImplementingNestedInterfaceShouldContainMethodsFromSuperInterfaces() {
        shouldNotCompile """
            interface A { def a() }
            interface B extends A { def b() }
            class BImpl implements B {
                def b(){ println 'foo' }
            }
            new BImpl().b()
            """
    }

    void testAbstractClass() {
        def shell = new GroovyShell()
        def text = """
            abstract class A {
                abstract void methodOne(Object o)
                Object methodTwo(){
                    assert true
                    methodOne(null)
                    return new Object()
                }
            }
            
            class B extends A {
                void methodOne(Object o){assert true}
            }
            
            def b = new B();
            return b.methodTwo()
            """
        def retVal = shell.evaluate(text)
        assert retVal.class == Object
    }    
    
    void testClassExtendingAnAbstractClassButMissesMethod() {
        shouldNotCompile """
            abstract class A {
                abstract void methodOne(Object o)
                Object methodTwo(){
                    assert true
                    methodOne(null)
                    return new Object()
                }
                abstract void MethodThree()
            }
            
            abstract class B extends A {
                void methodOne(Object o){assert true}
            }
            
            class C extends B{}
            
            def b = new C();
            return b.methodTwo()
            """    
        
       shouldNotCompile """
            abstract class A {
                abstract void methodOne(Object o)
                Object methodTwo(){
                    assert true
                    methodOne(null)
                    return new Object()
                }
                abstract void MethodThree()
            }
            
            class B extends A {
                void methodOne(Object o){assert true}
            }
            
            def b = new B();
            return b.methodTwo()
            """
    }
    
    void testInterfaceAbstractClassCombination() {
        def shell = new GroovyShell()
        def text = """
            interface A {
                void methodOne()
            }
            
            abstract class B implements A{
                abstract void methodTwo()
            }
            
            class C extends B {
                void methodOne(){assert true}
                void methodTwo(){
                  methodOne()
                }
            }
            def c = new C()
            c.methodTwo()
            """
        shell.evaluate(text)
        
        shouldNotCompile """
            interface A {
                void methodOne()
            }
            
            abstract class B implements A{
                abstract void methodTwo()
            }
            
            class C extends B {}
            def c = new c()
            c.methodTwo()
            """
    }
    
    void testDefaultModifiersForInterfaces() {
        def shell = new GroovyShell()
        def text = """
            import java.lang.reflect.Modifier
            
            interface A {
                def foo
            }
            
            def fields = A.class.declaredFields
            assert fields.length==1
            assert fields[0].name == "foo"
            assert Modifier.isPublic (fields[0].modifiers)
            assert Modifier.isStatic (fields[0].modifiers)
            assert Modifier.isFinal  (fields[0].modifiers)
            """
        shell.evaluate(text)
    }
    
    void testAccessToInterfaceField() {
        def shell = new GroovyShell()
        def text = """
            interface A {
                def foo=1
            }
            class B implements A {
              def foo(){foo}
            }
            assert new B().foo()==1
       """
       shell.evaluate(text)
    }

    void testImplementsDuplicateInterface() {
        shouldCompile """
        interface I {}
        class C implements I {}
        """
        shouldNotCompile """
        interface I {}
        class C implements I, I {}
        """
    }

    void testDefaultMethodParamsNotAllowedInInterface() {
        shouldCompile """
        interface Foo {
           def doit( String param, int o )
        }
        """
        shouldNotCompile """
        interface Foo {
           def doit( String param = "Groovy", int o )
        }
        """
    }
    
    void testClassImplementsItselfCreatingACycle() {
        def scriptStr = """
            package p1
            class XXX implements XXX {}
        """
        shouldNotCompile scriptStr
        
        scriptStr = """
            class YYY implements YYY {}
        """
        shouldNotCompile scriptStr
    }
}

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