Instances of reading, writing and copying IO stream files in Java

//Construct file class file f = new file (filename);

//Determine whether the directory is f.isdirectory();

//Get the file name in the directory string [] filename = f.list();

//Get the file in the directory file [] files = f.listfiles();

1. How does Java read files

2. How does java write files

3. How does Java copy files

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