java对象Integer不能引用传递

 /**
     * The value of the <code>Integer</code>.
     *
     * @serial
     */
    private final int value;  

    /**
     * Constructs a newly allocated <code>Integer</code> object that
     * represents the specified <code>int</code> value.
     *
     * @param   value   the value to be represented by the
     *          <code>Integer</code> object.
     */
    public Integer(int value) {
    this.value = value;
    }

原因：value 使用final 定义

解决：可以使用原子类 AtomicInteger 来实现