技術標籤：Java

題目要求

分別使用FileWriter 和 BufferedWriter 往檔案中寫入1萬個隨機數，比較用時的多少？(用時採用方法System.currentTimeMillis()）求時間差;

FileWriter

import java.io.FileOutputStream;
import java.io.IOException;

public class Test1 {
	public static void main(String[] args) throws IOException {
		FileOutputStream output = new FileOutputStream
 
("temp.dat");
		long start = System.currentTimeMillis();
		for (int i = 0; i < 10000; i++) {
			output.write((int) (Math.random()*10));
		}
		long stop = System.currentTimeMillis();
		long time = stop-start;
		System.out.println("時間差為："+ time +"毫秒");
	}
}

BufferedWriter

import
 
 java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Test1 {
	public static void main(String[] args) throws IOException {
		BufferedOutputStream bouput = new BufferedOutputStream(
				new FileOutputStream("temp2.dat"
 
));
		long start2 = System.currentTimeMillis();
		for (int i = 0; i < 10000; i++) {
			bouput.write((int) (Math.random()*10));
		}
		long stop2 = System.currentTimeMillis();
		long time2 = stop2-start2;
		System.out.println("BufferedWriter的時間差為："+ time2 +" 毫秒");
	}
}