it is a question about java
import java.io.*;
class Test
{
public static void main(String[]args) throws IOException
{
int i;
FileInputStream r;
FileOutputStream r1;
try
{
r=new FileInputStream("E:\1.txt");
}
catch(FileNotFoundException e)
{
System.out.println("1");
return;//干什么作用啊
}
try
{
r1=new FileOutputStream("E:\2.txt");
}
catch(FileNotFoundException e)
{
System.out.println("2");
return;
}
try
{
while((i=r.read())!=-1)
{
r1.write(i);
}
}
catch(IOException e)
{
System.out.println("3");//why here don't have return,this word
}
r.close();
r1.close();
}
}
why i can not achieve functional?