//接口IInterfaceA1
package jieKou;

public interface IInterfaceA1 {
int method(int n);

}

//ClassA类
package jieKou;

public class ClassA implements IInterfaceA1 {

@Override
public int method(int n) {
	int m=n;
	for(int i=1;i<n;i++)
	{
		m+=i;
	}
	return m;
}

}

//ClassB类
package jieKou;

public class ClassB implements IInterfaceA1 {

@Override
public int method(int n) {
	int m=n;
	for(int i=1;i<n;i++)
	{
		m*=i;
	}
	return m;
}

}

//测试类E1
package jieKou;

public class E1 {

public static void main(String[] args) {

IInterfaceA1 a=new ClassA();
ClassB b=new ClassB();
System.out.println(a.method(10));
System.out.println(b.method(5));

}

}

//运行结果

55
120

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