import java.util.*;
interface Sample{ //定数はインターフェースに定義できるよ public final static int num=10; // Abstract method public abstract is created automatically public abstract void hoge();
}
interface Test{ //定数はインターフェースに定義できるよ public final static int num=10; // Abstract method public abstract is created automatically public abstract void exe();
}
//多重実現 class SampleImp implements Sample,Test{ public void hoge(){
}
public void exe(){
}
}
class A{
public int i=10;
A(int i){
System.out.println ("Constructor for A"); }
void test(){
System.out.println("void test A");
}
void test2(){
System.out.println("void test2 A");
}
}
class B extends A{
public int i=100;
B(){
super(100);
System.out.println("Bkon");
}
@Override
void test(){
System.out.println("void test B");
}
void test3(){
System.out.println("void test3 B");
}
}
public class Main { public static void main(String[] args) throws Exception {
//キャストアップの例 // When casting from a subclass to a super, the closer 10 variable is used and the method is overridden //れたテスト２と出力、Bのメソッドは上書きされていないので使おうとするとエラー
// Note: The superclass is prioritized for field variables, and the subclass is prioritized for methods. A b= new B();
b.test();
//b.test3();
// Example of downcast ↓ Only the upcast can be returned. You can also use instanceof as a method to check.
// Upcast (implicit) A bb= new B();
// Downcast (explicit) B bbb = (B)bb;
// SubClass methods bbb.test(); bbb.test3();
}
}