记录自己的java面试题目

这一段找工作,顺便把面试的题目记录下来。

一.读txt文件

1.


import java.io.File;


import java.io.FileReader;




public class ReadTxt ...{




public static void main(String[] args) ...{


File f = new File("D:/sql.txt");




try ...{


FileReader fr = new FileReader(f);


char[] temp= new char[(int)f.length()];


fr.read(temp);


StringBuffer sb = new StringBuffer();




for(int i=0;i<temp.length;i++)...{


sb.append(temp[i]);


}


System.out.println(sb.toString());




} catch (Exception e) ...{


e.printStackTrace();


}


}


}

2.

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
public class ReadTxt1 {
public static void main(String[] args) {
try {
FileInputStream fis = new FileInputStream("D:/sql.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(fis));
String s;
StringBuffer sb = new StringBuffer();
while((s = br.readLine())!=null){
sb.append(s + " /n");
}
System.out.println(sb.toString());
} catch (Exception e) {
e.printStackTrace();
}
}
}