testclone2.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

package chapter8;

class TestClone2 implements Cloneable
{
    int a;
    double b;
    public Object clone()
    {
        try
        {
            // 在对象内调用clone()方法
            return super.clone();
        }
        catch(CloneNotSupportedException e)
        {
            System.out.println("Cloning not allowed.");
            return this;
        }
    }

    public static void main(String args[])
    {
        TestClone2 x1 = new TestClone2();
        TestClone2 x2;
        x1.a = 10;
        x1.b = 20.98;
        // 这里直接调用clone()方法
        x2 = (TestClone2) x1.clone();
        System.out.println("x1: " + x1.a + " " + x1.b);
        System.out.println("x2: " + x2.a + " " + x2.b);
    }
}