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要求:
- 把程序调整为可以对文本文件按行进行读取,每读取一行后显示此行,并统计此行有多少字节,有多少字符并显示统计结果。最后显示总的行数。
程序:
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
public class FileLine {
public static void main (String args[]) throws IOException {
File a = new File("E:\\年少有为.txt"); //Creates a new File instance
if (a.exists()) { //Tests whether the file or directory denoted by this abstract pathname exists.
System.out.println("文本:" + a.getName() + " 存在");
}
else {
System.out.println("文本:" + a.getName() + "不存在");
}
FileReader fr = new FileReader("E:\\年少有为.txt");//Creates a new FileReader
BufferedReader br = new BufferedReader(fr);
//Reads text from buffering characters so as to provide for the efficient reading of characters
String s = null;
int i = 0;
while((s = br.readLine())!= null) { //Reads a line of text.
i++;
System.out.println("第 " + i + " 行内容为:" + s);//A String containing the contents of the line
System.out.println("第 " + i + " 行有 " + s.length() + "个字符");//Returns the length of the file
}
System.out.println("文本一共有 " + i + " 行");
}
}