jdk 历史版本

http://jdk.java.net/

java 在线API

http://www.matools.com/api/java8

http://www.matools.com/api/java11

java 7新增的java.nio.file.Files 各种方法中的 Path 参数配合 Paths.get 方法处理
java.nio.file.Files

/**
 * This class consists exclusively of static methods that return a {@link Path}
 * by converting a path string or {@link URI}.
 *
 * @since 1.7
 */

public final class Paths {
    private Paths() { }

    public static Path get(String first, String... more) {
        return FileSystems.getDefault().getPath(first, more);
    }

    public static Path get(URI uri) {
        String scheme =  uri.getScheme();
        if (scheme == null)
            throw new IllegalArgumentException("Missing scheme");

        // check for default provider to avoid loading of installed providers
        if (scheme.equalsIgnoreCase("file"))
            return FileSystems.getDefault().provider().getPath(uri);

        // try to find provider
        for (FileSystemProvider provider: FileSystemProvider.installedProviders()) {
            if (provider.getScheme().equalsIgnoreCase(scheme)) {
                return provider.getPath(uri);
            }
        }

        throw new FileSystemNotFoundException("Provider \"" + scheme + "\" not installed");
    }
}

// 文件写入
Files.write(Path path, byte[] bytes, OpenOptions ...options);


//Files.copy(Path from,Path to);
// 文件复制
Path path=Paths.get(“复制的文件路径”);
Path pp=Files.copy(path,Paths.get("复制到的路径"));

google

//文件写入
Files.write(byte[] bytes, File file)