java输入输出流的使用

import java.io.*;
public class pipel{
char c[]=new char[100];
public void change(){
for(int i=0;i<6;i++){
if(c[i]=='a'){
c[i]='A';
}
}
}
public pipel(){}
public void connection(){
try{
File f=new File("text1.txt");File fc=new File("text2.txt");
FileInputStream in=new FileInputStream(f);
InputStreamReader ir=new InputStreamReader(in);
ir.read(c);
}catch(Exception e){e.printStackTrace();}
}
public void push(){
try{
File fc=new File("text2.txt");
FileOutputStream out=new FileOutputStream(fc);
OutputStreamWriter ow=new OutputStreamWriter(out);
ow.write(c);
ow.close();
}catch(Exception e){e.printStackTrace();}
}
public static void main(S