Java 创建对象的方式:
上述 1、2 会调用构造函数
上述 3、4 不会调用构造函数
package constxiong.interview;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
/**
* 测试创建对象
* @author ConstXiong
* @date 2019-10-31 11:53:31
*/
public class TestNewObject implements Cloneable, Serializable{
private static final long serialVersionUID = 1L;
public TestNewObject() {
System.out.println("Constructor init");
}
public static void main(String[] args) throws Exception {
TestNewObject o1 = new TestNewObject();
TestNewObject o2 = TestNewObject.class.newInstance();
TestNewObject o3 = TestNewObject.class.getConstructor().newInstance();
TestNewObject o4 = (TestNewObject)o1.clone();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(o1);
ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()));
TestNewObject o5 = (TestNewObject)ois.readObject();
}
}
打印
Constructor init
Constructor init
Constructor init