Java read file contents

(3) Reference materials P283 [15.5] cases, the use of the character stream classes FileReader and FileWriter classes with class and BufferedWriter BufferedReader class that implements a text file (including Chinese) replication.

代码：
package class2;

import java.io.*;
public class MyIOs {
    public static void main(String[] args) throws IOException{
        
        File file=new File("d:/java123/word.txt");
        FileReader fr = new FileReader(file);
        BufferedReader br=new BufferedReader(fr);
        
        File file1=new File("d:/java123/wordcopy.txt");
        FileWriter fr1 = new FileWriter(file1);
        BufferedWriter br1=new BufferedWriter(fr1);
        
        String str=null;
        while((str=br.readLine())!=null) {
            br1.write(str);
            br1.newLine();
        }
        System.out.println("复制成功！");
        br1.close();
        fr1.close();
        br.close();
        fr.close();
    }
}

Run shot:

(4) use BufferedReader class accepts input from the console (the "###" marks the end), the contents of the input display output out and written to the file "input.txt".

代码：
package class2;

import java.io.*;
public class MyIO1{
    public static void main(String[] args) throws IOException {
        String str,str1;
        int i=1;
        File file =new File("d:/java123/input.txt");
        FileWriter fw=new FileWriter(file);
        BufferedWriter bw=new BufferedWriter(fw);

        InputStreamReader isr=new InputStreamReader(System.in);
        BufferedReader br1=new BufferedReader(isr);
        
        
        while(!(str=br1.readLine()).equals("###")) {
            bw.write(str);
            bw.newLine();
            System.out.println("input文件第"+i+"行为:"+str);
            i++;
        }
        br1.close();
        isr.close();
        bw.close();
        fw.close();
    }
}

Run shot: