JAVA IO - OutputStream

OutputStream能夠將byte寫入到文件中，可是要注意write有重載方法。

write(int b)和write(byte[] b), 效率上有差別。

 

import java.io.FileOutputStream;
import java.io.OutputStream;


public class WriteBytes2File {
    public static void main(String args[]) throws Exception{
    	 OutputStream out = new FileOutputStream(
    		        "helloworld.txt");
    		    String str = "hello world!";
    		    out.write(str.getBytes()); //write(byte[])
    		    out.close();
    		    writeByByte();
    }
    
    public static void writeByByte() throws Exception{
    	OutputStream out = new FileOutputStream(
		        "helloworld1.txt");
		    String str = "hello world!";
		    //out.write(str.getBytes());
		    for(Byte b : str.getBytes()){
		    	out.write(b);//write(int)
		    }
		    out.close();
    }
 
    public static void append() throws Exception{
     OutputStream out = new FileOutputStream(
          "helloworld1.txt", true);
      String str = "hello java!";
      //out.write(str.getBytes());
      for(Byte b : str.getBytes()){
       out.write(b);
      }
      out.close();
    }}