Java接口的简单定义与实现方法示例

interface interfaceName{
全局常量
抽象方法
}

interface Inter1{
  //全局公共常量
  public static final int AGE=100;
  public abstract void tell();
}
interface Inter2{
  public abstract void say();
}
abstract class Abs1{
  public abstract void print();
}
class A extends Abs1 implements Inter1,Inter2{
  @Override
  public void tell() {
  }
  @Override
  public void say() {
  }
  @Override
  public void print() {
  }
}
interface Inter3 extends Inter1,Inter2{
}
public class InterDemo01 {
  public static void main(String [] args){
//    Inter inter=new Inter();
    A a=new A();
    a.tell();
    System.out.println(Inter1.AGE);
    a.say();
  }
}