答案是：import java.io.*;
public class C {
public static void main(String[] args) throws IOException {
File inputFile = new File(“a.txt");
File outputFile = new File(“b.txt");
FileReader in = new FileReader(inputFile);
FileWriter out = new FileWriter(outputFile);
int c;
while ((c = in.read() ) != -1) out.write(c);
in.close();
out.close(); }
}
复制文件a.txt到文件b.txt
