java interface & abstract class

Multiple markers at this line
	- The type TestInterfaceImpl must implement the inherited abstract method TestInterface.add(Object)
	- The type TestInterfaceImpl must implement the inherited abstract method TestInterface.update(Object)
	- The type TestInterfaceImpl must implement the inherited abstract method TestInterface.delete(Object)
	- The type TestInterfaceImpl must implement the inherited abstract method TestInterface.select(Object)
	- The type TestInterfaceImpl must implement the inherited abstract method TestInterface.save(Object)
	- The type TestInterfaceImpl must implement the inherited abstract method TestInterface.getById(Object)



Cannot instantiate the type TestAbstract

package ce.service;

import java.util.List;


public abstract class TestAbstract
{

	public List<Object> select(Object newObj)
	{
		return null;
	}
	
	public Object getById(Object newObj)
	{
		return null;
	}
	
	public boolean delete(Object newObj)
	{
		return false;
	}

	public boolean save(Object newObj)
	{
		return false;
	}

	public boolean update(Object newObj)
	{
		return false;
	}

	public boolean add(Object newObj)
	{
		return false;
	}
	
}

package ce.service;

public class TestAbstractChild extends TestAbstract
{

}

package ce.service;

public class TestDemo
{

	public static void main(String[] args)
	{
		TestAbstract t = new TestAbstract();
	}
}

package ce.service;

import java.util.List;

public interface TestInterface
{

	public List<Object> select(Object newObj);
	
	public Object getById(Object newObj);
	
	public boolean delete(Object newObj);

	public boolean save(Object newObj);

	public boolean update(Object newObj);

	public boolean add(Object newObj);
	
}

package ce.service;

public class TestInterfaceImpl implements TestInterface
{

}