[Java] 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();
  }
}

100