JavaプログラミングTips

詳細
1シーケンス化によるオブジェクトの深度コピー

	public static  T deepCloneBySerialize(T src) {
		T o = null;
		try {
			if (src != null) {
				ByteArrayOutputStream baos = new ByteArrayOutputStream();
				ObjectOutputStream oos = new ObjectOutputStream(baos);
				oos.writeObject(src);
				oos.close();
				ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
				ObjectInputStream ois = new ObjectInputStream(bais);
				o = (T)ois.readObject();
				ois.close();
			}
		} catch (IOException e) {
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		return o;
	}

 
 
 
2デフォルトのCharsetを取得
    Use the I/O system to get the encoding (if possible), to avoid security restrictions on System.getProperty("file.encoding") in applets (why is that restricted?)
 

OutputStreamWriter outWriter = null;
        try {
            outWriter = new OutputStreamWriter(new ByteArrayOutputStream());
            jvmPlatformCharset = outWriter.getEncoding();
        } finally {
            try {
                if (outWriter != null) {
                    outWriter.close();
                }
            } catch (IOException ioEx) {
                // ignore
            }
        }