编写2个接口：InterfaceA和InterfaceB；在接口InterfaceA中有个方法void printCapitalLetter()；在接口InterfaceB中有个方法void printLowercaseLetter()；然 后写一个类Print实现接口InterfaceA和InterfaceB，最后再在主类E 的main方法中创建Print的对象并赋值，运行方法

package lianxi;

public interface InterfaceA {
    void printCapitalLetter();

}

package lianxi;

public interface InterfaceB {
    void printLowercaseLetter();
}

package lianxi;

public class Print1 implements InterfaceA, InterfaceB {

    @Override
    public void printLowercaseLetter() {
        for (int i = 97; i < 123; i++) {
            System.out.print((char)i);

        }
           System.out.println();
    }

    @Override
    public void printCapitalLetter() {
        for (int i =65; i < 91; i++) {
            System.out.print((char)i);

        }
           System.out.println();
    }

}

package lianxi;

public class E {

public static void main(String[] args) {

     InterfaceA a=new Print1();
     InterfaceB b=new Print1();
     a.printCapitalLetter();
     b.printLowercaseLetter();

}

}