package lambdasinaction.chap3;
import java.io.*;
public class ExecuteAround {
public static void main(String ...args) throws IOException{
// method we want to refactor to make more flexible
String result = processFileLimited();
System.out.println(result);
System.out.println("---");
String oneLine = processFile((BufferedReader b) -> b.readLine());
System.out.println(oneLine);
String twoLines = processFile((BufferedReader b) -> b.readLine() + b.readLine());
System.out.println(twoLines);
}
public static String processFileLimited() throws IOException {
try (BufferedReader br =
new BufferedReader(new FileReader("lambdasinaction/chap3/data.txt"))) {
return br.readLine();
}
}
public static String processFile(BufferedReaderProcessor p) throws IOException {
try(BufferedReader br = new BufferedReader(new FileReader("lambdasinaction/chap3/data.txt"))){
return p.process(br);
}
}
public interface BufferedReaderProcessor{
public String process(BufferedReader b) throws IOException;
}
}
代码摘自:java8 in action