Java SE 7 has java.nio.file.attribute.PosixFileAttributes which gives you fine grained control over read, write, and execute permissions for owner, group, and others.
import java.nio.file.*;
import java.nio.file.attribute.*;
import java.util.Set;
public class Test {
public static void main(String[] args) throws Exception {
Path path = Paths.get("/tmp/test-file.txt");
if (!Files.exists(path)) Files.createFile(path);
Set<PosixFilePermission> perms = Files.readAttributes(path,PosixFileAttributes.class).permissions();
System.out.format("Permissions before: %s%n", PosixFilePermissions.toString(perms));
perms.add(PosixFilePermission.OWNER_WRITE);
perms.add(PosixFilePermission.OWNER_READ);
perms.add(PosixFilePermission.OWNER_EXECUTE);
perms.add(PosixFilePermission.GROUP_WRITE);
perms.add(PosixFilePermission.GROUP_READ);
perms.add(PosixFilePermission.GROUP_EXECUTE);
perms.add(PosixFilePermission.OTHERS_WRITE);
perms.add(PosixFilePermission.OTHERS_READ);
perms.add(PosixFilePermission.OTHERS_EXECUTE);
Files.setPosixFilePermissions(path, perms);
System.out.format("Permissions after: %s%n", PosixFilePermissions.toString(perms));
}
}
Which can then be used like:
$ rm -f /tmp/test-file.txt && javac Test.java && java Test
Permissions before: rw-r--r--
Permissions after: rwxrwxrwx