java-Java克隆對象失敗，裡面的對象屬性沒有克隆成功

Java克隆對象失敗，裡面的對象屬性沒有克隆成功

想克隆一個輸入流對象
類：
class CloneTest implements Cloneable{

    public InputStream inputStream = null;

    public CloneTest(InputStream inputStream){
        this.inputStream = inputStream;
    }

    public Object clone() throws CloneNotSupportedException {
        CloneTest cloneTest = (CloneTest)super.clone();
        return cloneTest;
    }

    public InputStream getInputStream() {
        return inputStream;
    }

    public void setInputStream(InputStream inputStream) {
        this.inputStream = inputStream;
    }

}

調用的代碼：
CloneTest ct = new CloneTest(inputStream);
CloneTest ct2 = (CloneTest)ct.clone();
InputStream inputStream2 = ct2.getInputStream();

這裡得到的inputStream2和傳進去的參數inputStream還是同一個對象，如何克隆呢？

最佳回答：

斗膽來回答, 你的clone方法中只是簡單的調用了CloneTest的父類的clone方法,
這裡jvm並不會自動復制你的InputStream屬性.如果你需要克隆後的對象和克隆
前的對象引用不同的InputStream對象,那麼你需要自己編碼復制該InputStream
對象.
就像下面這樣

 public Object clone() throws CloneNotSupportedException {
        CloneTest cloneTest = (CloneTest) super.clone(); 

        ByteArrayOutputStream baos = new ByteArrayOutputStream();  
        byte[] buffer = new byte[1024];  
        int len;  
        try {
            while ((len = inputStream.read(buffer)) > -1 ) {  
                baos.write(buffer, 0, len);  
            }
            baos.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }                
        InputStream is = new ByteArrayInputStream(baos.toByteArray());
        cloneTest.setInputStream(is);
        return cloneTest;
    }