231220 JAVA Inter02(인터페이스)

package com.sukgi.inter;

//interface

 

interface SayHi {

 

public static final int NUMBER = 0;

 

public void sayHello();

 

public void sayBye();

 

}

 

public class Inter02 implements SayHi {

 

@Override

public void sayHello() {

}

 

@Override

public void sayBye() {

 

}

 

}