java 8 default_Java8 default方法

importjava.util.Arrays;/***

*@authormdyb

* date: 2017/8/11

* file: ISuperImpl.java*/

public class ISuperImpl implementsISuper {public static voidmain(String[] args) {

ISuper iSuper= newISuperImpl();

iSuper.showClass();//无覆盖直接调用

System.out.println("\n====================");

ISuper iSuper2= newISuperImpl2();

iSuper2.showClass();//调用覆盖的方法

System.out.println("\n====================");

ISuper iSuper3= newISuperImpl3();

iSuper3.showClass();

System.out.println("\n====================");

ISuper iSuper31= newISuperImpl3();

ISuper iSuper21= newISuperImpl2();

ISuper iSuper11= newISuperImpl();

System.out.println("iSuper value = " +iSuper.getValue());

ISuper[] s= ISuper.filter(5000, iSuper, iSuper11, iSuper2, iSuper21, iSuper3, iSuper31);

ISuper[] s2= ISuper.filter(4000, iSuper, iSuper11, iSuper2, iSuper21, iSuper3, iSuper31);

Arrays.stream(s).forEach((a)-> System.out.print(a.getValue() + " "));

System.out.println();

Arrays.stream(s2).forEach((a)-> System.out.print(a.getValueRandom() + " "));

}private int value = (int) (Math.random() * 2000);

@Overridepublic intgetValueRandom() {return value + 3333;

}

@Overridepublic intgetValue() {returnvalue;

}

}class ISuperImpl2 implementsISuper {private int value = (int) (Math.random() * 777);//default 方法可以覆盖

@Overridepublic voidshowClass() {

System.out.println("before");

ISuper.super.showClass();

System.out.println("after");

}

@Overridepublic intgetValueRandom() {return (value + 2000) * 2;

}

@Overridepublic intgetValue() {returnvalue;

}

}class ISuperImpl3 implementsISuper {privateString status;private int value = (int) (3141 + Math.random() * 600);publicISuperImpl3() {

status= getClass().getName() +System.currentTimeMillis();

}

@Overridepublic voidshowClass() {

System.out.println("class status of calling this method: "+status + System.currentTimeMillis() + "\n" +Math.random());

}

@Overridepublic intgetValueRandom() {return (value + status.length() - (int) (1333 * Math.random())) / 2;

}

@Overridepublic intgetValue() {returnvalue;

}

}