设计模式-原型模式(深拷贝)

浅拷贝：拷贝了对象的基本数据类型或其封装类，对于内部的数组、引用对象  依旧是采用引用的形式；

@Data
public class TestEntity implements Cloneable{
    private String testAid;
    private String testAname;
    private TestEntityB testEntityB;

    public TestEntity(){
    }

    @Override
    protected TestEntity clone() {
        TestEntity testEntity = null;
        try {
            testEntity = (TestEntity)super.clone();
         /*   testEntity.testEntityB = (TestEntityB)this.getTestEntityB().clone();*/
        } catch (CloneNotSupportedException e) {
            //异常处理
        }
        return testEntity;
    }

运行结果：

虽然克隆后 a==a3为false，已经是指向不同的引用地址了， 但是其内部的对象entityB依旧指向相同的地址；这种clone方式叫浅拷贝。

深拷贝：对私有的数组，引用对象也会进行拷贝，引用不同的地址；

  

@Data
public class TestEntity implements Cloneable{
    private String testAid;
    private String testAname;
    private TestEntityB testEntityB;

    public TestEntity(){
    }

    @Override
    protected TestEntity clone() {
        TestEntity testEntity = null;
        try {
            testEntity = (TestEntity)super.clone();
            testEntity.testEntityB = (TestEntityB)this.getTestEntityB().clone(); //**代码
        } catch (CloneNotSupportedException e) {
            //异常处理
        }
        return testEntity;
    }

 

@Data
public class TestEntityB   implements Cloneable  {
    private String testBId;
    private String testBname;

    @Override
    protected TestEntityB clone() {
        TestEntityB testEntityB = null;
        try {
            testEntityB =  (TestEntityB)super.clone();
        } catch (CloneNotSupportedException e) {

        }

        return testEntityB;
    }

运行结果： 

注意：咱们的被引用类如果要使用clone方法必须也要实现Cloneable接口。