关于 Cloneable 接口 和 重写 Object.clone() 方法的尝试顺便复习深拷贝和浅拷贝

一个类如果想重写 Object 的 clone 方法，则必须实现 Cloneable 接口，否则调用 clone 方法时将会抛出 CloneNotSupportException 异常

/**
 * Author:  heatdeath
 * Date:    2018/7/7
 * Desc:
 */
public class CloneDemo {
   
   
    static class CloneClass {
        public String str;

        @Override
        protected Object clone() throws CloneNotSupportedException {
            return super.clone();
        }
    }

    public static void main(String[] args) throws Exception {
        CloneClass cloneClass1 = new CloneClass();
        System.out.println(cloneClass1);
        cloneClass1.str = "hello world";

        CloneClass cloneClass2 = (CloneClass) cloneClass1.clone();
        System.out.println(cloneClass2);
        System.out.println(cloneClass2.str);
    }
}

com.heatdeath.test_package.CloneDemo$CloneClass@4554617c
Exception in thread "main" java.lang