浅析Java接口类的形参和返回值

不说废话，直接贴代码！

interface TestInterface{
	public abstract void testMethod();
}

public class TestInterfaceDemo{
	public void method(TestInterface ti) { 
		//ti = new TestInterfaceImpl ();  
		//TestInterface ti = new TestInterfaceImpl (); 多态
		ti.testMethod();
	}
}

public class TestInterfaceImpl implements TestInterface {
	public void testMethod() {
		System.out.println("test interface");
	}
}

public class TestInterfaceImplDemo {
	public static void main(String[] args) {
		//需求：我要测试TestInterfaceDemo类中的testMethod()方法
		TestInterfaceDemo tid = new TestInterfaceDemo();
		TestInterface ti = new TestInterfaceImpl();
		tid.testMethod(ti);
	}
}