Java克隆对象失败，里面的对象属性没有克隆成功

Question

想克隆一个输入流对象
类：
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;
    }

}

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

这里得到的inputStream2和传进去的参数inputStream还是同一个对象，如何克隆呢？

Answer 1

斗胆来回答, 你的clone方法中只是简单的调用了CloneTest的父类的clone方法,
这里jvm并不会自动复制你的InputStream属性.如果你需要克隆后的对象和克隆
前的对象引用不同的InputStream对象,那么你需要自己编码复制该InputStream
对象.
就像下面这样

 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;
    }