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Abstract type: Difference between revisions
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As in [[Java]], methods that are declared but not implemented are called "abstract" methods. An interface is a class-level typing construct that can only contain abstract method declarations (well, and constants, but pay no attention to those).
<lang groovy>public interface Interface {
int method1(double value)
int method2(String name)
int add(int a, int b)
}</lang>
An abstract class may implement some of its methods and leave others unimplemented. The unimplemented methods and the class itself must be declared "abstract".
<lang groovy>public abstract class Abstract1 {
abstract public int methodA(Date value)
abstract protected int methodB(String name)
int add(int a, int b) { a + b }
}</lang>
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