Admin: 1 версия

2010-06-01T06:02:45Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:43Z

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== Creates a tiny text editor with BufferedReader ==



<source lang="java">

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
class TinyEdit {
public static void main(String args[]) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str[] = new String[100];
System.out.println("Enter lines of text.");
System.out.println("Enter "stop" to quit.");
for (int i = 0; i < 100; i++) {
str[i] = br.readLine();
if (str[i].equals("stop"))
break;
}
System.out.println("\nHere is your file:");
for (int i = 0; i < 100; i++) {
if (str[i].equals("stop"))
break;
System.out.println(str[i]);
}
}
}
</source>



== how to read lines from a file and print these to the standard output stream ==



<source lang="java">

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
class FileReaderDemo {
public static void main(String args[]) throws IOException {
FileReader fr = new FileReader("FileReaderDemo.java");
BufferedReader br = new BufferedReader(fr);
String s;
while ((s = br.readLine()) != null) {
System.out.println(s);
}
fr.close();
}
}
</source>



== Read a string from console using a BufferedReader. ==



<source lang="java">

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
class BRReadLines {
public static void main(String args[]) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str;
System.out.println("Enter lines of text.");
System.out.println("Enter "stop" to quit.");
do {
str = br.readLine();
System.out.println(str);
} while (!str.equals("stop"));
}
}
</source>



== Use a BufferedReader to read characters from the console. ==



<source lang="java">

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
class BRRead {
public static void main(String args[]) throws IOException {
char c;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter characters, "q" to quit.");
do {
c = (char) br.read();
System.out.println(c);
} while (c != "q");
}
}
</source>



== Writing to a Text File ==



<source lang="java">

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
public class WriteFile {
public static void main(String[] args) {
Product[] movies = new Product[10];
movies[0] = new Product("L", 1946, 14.95);
movies[1] = new Product("T", 1965, 12.95);
movies[2] = new Product("Y", 1974, 16.95);
movies[3] = new Product("T", 1975, 11.95);
movies[4] = new Product("S", 1977, 17.95);
movies[5] = new Product("B", 1987, 16.95);
movies[6] = new Product("G", 1989, 14.95);
movies[7] = new Product("A", 1995, 19.95);
movies[8] = new Product("G", 1997, 14.95);
movies[9] = new Product("R", 2001, 19.95);
PrintWriter out = openWriter("movies.txt");
for (Product m : movies)
writeMovie(m, out);
out.close();
}
private static PrintWriter openWriter(String name) {
try {
File file = new File(name);
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(file)), true);
return out;
} catch (IOException e) {
System.out.println("I/O Error");
System.exit(0);
}
return null;
}
private static void writeMovie(Product m, PrintWriter out) {
String line = m.title;
line += "\t" + Integer.toString(m.year);
line += "\t" + Double.toString(m.price);
out.println(line);
}

}
class Product {
public String title;
public int year;
public double price;
public Product(String title, int year, double price) {
this.title = title;
this.year = year;
this.price = price;
}
}
</source>

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Java/File Input Output/Buffered Reader Writer - История изменений

Admin: 1 версия

в 18:01, 31 мая 2010