Abstract type: Difference between revisions

Content added Content deleted

Inline

@@ Line 38: / Line 38: @@
 =={{header|Java}}==
-Abstract classes in Java can define methods and aren't required to have abstract methods. If a method is abstract, it must be public or protected
+Methods that don't have an implementation are called abstract methods in Java. A class that contains an abstract method or inherits one but did not override it must be an abstract class; but an abstract class does not need to contain any abstract methods. An abstract class cannot be instantiated. If a method is abstract, it must be public or protected
 <java>public abstract class Abs {
 	abstract public int method1(double value);
@@ Line 46: / Line 46: @@
 	}
 }</java>
-Interfaces in Java may not define any methods and all methods must be public and can be abstract.
+Interfaces in Java may not implement any methods and all methods are implicitly public and abstract.
 <java>public interface Inter {
-	public int method1(double value);
+	int method1(double value);
-	public int method2(String name);
+	int method2(String name);
-	abstract public int add(int a, int b);
+	int add(int a, int b);
 }</java>