java 继承多个接口

java 继承多个接口

public interface InterfaceA {

int len = 1 ;

void output();

}

public interface InterfaceB {

int len = 2 ;

void output();

}

public interface InterfaceSub extends InterfaceA, InterfaceB { };

public class Xyz implements InterfaceSub {

public void output() {

System.out.println("output in class Xyz.");

}

public void output1(){

System.out.println("output1.");

}

public void output2(){

System.out.println("output2.");

}

public void outputLen(int type) {

switch (type) {

case InterfaceA.len:

System.out.println("len of InterfaceA=." + type);

break;

case InterfaceB.len:

System.out.println("len of InterfaceB=." + type);

break;

}

}

public static void main(String[] args) {

//Xyz xyz= new Xyz ();

Xyz xyz = new Xyz();

xyz.output();

xyz.outputLen(1);

xyz.output1();

xyz.output2();

//System.out.println(len);

}

}