fileinputdemo.java

nanjing university cs 的java课件。 对新手很有用。付课件中源码。

import java.io.*;
import java.util.*;
public class FileInputDemo {
	public static void main(String args[]) throws Exception {
		int size;
		InputStream f1 = new FileInputStream(args[0]);
		size = f1.available(); // total size
		System.out.println("Available : " + size);

		// Read the first 1/4 by read()
		for (int i = 0; i < size / 4; i++) {
			System.out.print( (char) f1.read());
		}
		System.out.println();
		
		System.out.println("Still available : " +f1.available());
		// Read the next 1/8 by read(b[])
		byte b[] = new byte[size / 8];
		if (f1.read(b) != b.length) {
			System.err.println("Something bad happened!");
		}
		System.out.println("Still available : " +f1.available());
		// Skip another 1/4: skip()
		f1.skip(size / 4);
		System.out.println("Still available : " +f1.available());
		f1.close();
	}
}