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FileOutputStream

The FileOutputStream class is a subclass of OutputStream. You can construct a FileOutputStream object by passing a string containing a path name or a File object. You can also specify whether you want to append the output to an existing file. public FileOutputStream (String path) public FileOutputStream (String path, boolean append) public FileOutputStream (File file) public FileOutputStream (File file, boolean append) With the first and third constructors, if a file by the specified name already exists, the file will be overwritten. To append to an existing file, pass true to the second or fourth constructor. import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; public class MainClass {   public static void main(String[] args) {     File originFile = new File("c:\\file1.txt");     File destinationFile = new File("c:\\file1.txt");     if (!originFile.exists() || destinationFile.exists()) {       return;     }     try {       byte[] readData = new byte[1024];       FileInputStream fis = new FileInputStream(originFile);       FileOutputStream fos = new FileOutputStream(destinationFile);       int i = fis.read(readData);       while (i != -1) {         fos.write(readData, 0, i);         i = fis.read(readData);       }       fis.close();       fos.close();     } catch (IOException e) {       System.out.println(e);     }   } }