filesource.java

应付作业+练习OOP做的东西

package datasource;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

public class FileSource extends AbstractDataSource {
    public FileSource(File target){
    	
    	try {
    		target.setReadable(true);
    		target.setReadOnly();
    		
			reader=new BufferedReader(new FileReader(target));
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    	
    }
	@Override
	protected double getNext() {
		if(hasMore()==false)throw new RuntimeException();
		double result=0;
		try {
			result = Double.parseDouble(reader.readLine());
			return result;
		
		} catch (Exception e) {
			throw new RuntimeException();
		}
		
	}

	@Override
	protected boolean hasMore() {
		try {
			return reader.ready();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	private BufferedReader reader;
	

}