Java (10) interface abstract class

Package A;public interface AAA {public int getmax (); String getmes ();} Package A;import static Java.lang.system.out;public class test implements Aaa{public int Getmax () {int i = 123;return i;} Public String Getmes () {string s = "method implemented in the interface"; return s;} public static void Main (string[] args) {//TODO auto-generated method Stubtest t = new test (); int i = T.getmax (); String s = t.getmes (); out.println (i); Out.println (s);}}

　　

Abstract methods must be inherited, abstract classes can have ordinary methods, abstract classes cannot be instantiated

instanceof

if (a instanceof B)

{ }

Java (10) interface abstract class