【简单问题】关于uper()

[小辉]

代码虽然长，但是非常简单，呵呵。各位大虾，请帮忙。

想实现这个：
父类构造体中接受传过来的字符串数组，
根据数组中的属性名 ，invoke对应的子类中的set方法，
初始化子类中的属性。

显然这种方法不行
子类中，先执行了super()
然后 执行了这句：
private String strName=null;
private String strAge=null;
把设置的值给清空了。

问题：
如何实现执行了父类的构造函数后，不执行子类的属性定义中的赋初值？
（这么设计父类的目的，是想在子类中继承后，能自动初始化属性值。）

父类：
---------------------------------------------------
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public abstract class ClsFather {


/**
* 根据字符串数组中的子类的属性名称，执行invoke设置子类属性值。
* @param aryStr
* @throws InvocationTargetException
* @throws IllegalAccessException
* @throws NoSuchMethodException
*/
public ClsFather(String[] aryStr) throws
NoSuchMethodException, IllegalAccessException, InvocationTargetException {

String strMedName = null;

for (int i = 0; i < aryStr.length; i++) {
strMedName = aryStr[i].toString();
if (strMedName != null && !strMedName.equals("")) {
// 获得方法名
strMedName = strMedName.replaceFirst(
strMedName.substring(0, 1), strMedName.substring(0, 1).toUpperCase());
// invoke执行方法 setXXXXXX(String)
Method method = this.getClass().getMethod("set" + strMedName,new Class[] {String.class});
Object []obj = new Object[] {new String(strMedName)};
method.invoke(this, obj);
}
}
}
}
---------------------------------------------------
子类：
---------------------------------------------------
import java.lang.reflect.InvocationTargetException;
public class ClsSon extends ClsFather {

private String strName=null;
private String strAge=null;

public ClsSon(String[] aryStr) throws
NoSuchMethodException, IllegalAccessException, InvocationTargetException {

super(aryStr);
}

public String getStrAge() {
return strAge;
}

public void setStrAge(String strAge) {
this.strAge = strAge;
}

public String getStrName() {
return strName;
}

public void setStrName(String strName) {
this.strName = strName;
}

}
---------------------------------------------------
//调用
public static void main(String[] args) throws
NoSuchMethodException, IllegalAccessException, InvocationTargetException {

ClsSon clsSon = new ClsSon (new String[] {"strName","strAge"});

System.out.println(clsSon.getStrAge());
System.out.println(clsSon.getStrName());

}

[jingulang]

好长

[dracularking]

子类属性初始化会在父类构造方法后

将子类属性转移给父类，配上合适的访问控制符，是解决此问题的方法之一

[justinavril]

strMedName.equals("") is not proper.


"".equals(strMedName)

[小辉]

TO：dracularking

>>将子类属性转移给父类，配上合适的访问控制符，是解决此问题的方法之一

呵呵，你说的没太理解，具体怎么搞啊，能说说吗，多谢。

[renmms]

新建个构造方法，加上子类的参数呢？

[justinavril]

[Quote=引用 4 楼 renmms 的回复:]
新建个构造方法，加上子类的参数呢？
[/Quote]

Of course, it can meet the demands. But maybe LZ just want to achieve it through reflection.

[renmms]

[Quote=引用 5 楼 justinavril 的回复:]
引用 4 楼 renmms 的回复:
新建个构造方法，加上子类的参数呢？


Of course, it can meet the demands. But maybe LZ just want to achieve it through reflection.
[/Quote]

what's your meaning of reflection?

[justinavril]

[Quote=引用 6 楼 renmms 的回复:]
引用 5 楼 justinavril 的回复:
引用 4 楼 renmms 的回复:
新建个构造方法，加上子类的参数呢？


Of course, it can meet the demands. But maybe LZ just want to achieve it through reflection.


what's your meaning of reflection?
[/Quote]
反射

Sorry, I can not type Chinese in company, because I have no Chinese Environment and no admin privilege to my PC.

[renmms]

[Quote=引用 7 楼 justinavril 的回复:]
引用 6 楼 renmms 的回复:
引用 5 楼 justinavril 的回复:
引用 4 楼 renmms 的回复:
新建个构造方法，加上子类的参数呢？


Of course, it can meet the demands. But maybe LZ just want to achieve it through reflection.


what's your meaning of reflection?

反射

Sorry, I can not type Chinese in company, because I have no Chinese Environment and no admin privilege to my PC.
[/Quote]

o,I see.My os is also EN Vista,English Environment too,but I hava installed "sougou piyin",it is convenience.
:)

[justinavril]

Here is my opinion:

In your class ClsSon, firstly strName and strAge are initialized, then the constructors run. So I am not agree with :"子类中，先执行了super()
然后 执行了这句：
private String strName=null;
private String strAge=null;
把设置的值给清空了。 "

[justinavril]

[Quote=引用楼主 crazy_boy1 的帖子:]
子类中，先执行了super()
然后 执行了这句：
private String strName=null;
private String strAge=null;
把设置的值给清空了。
[/Quote]
Here is my opinion:

In class ClsFather, firstly the variables: strName and strAge are initialized, then the constructor runs.

So I don't agree with you.

Maybe I made a mistake, but you need to check that the constructor of ClsFather works fine!

[wangydong]

[Quote=引用 1 楼 dracularking 的回复:]
子类属性初始化会在父类构造方法后

将子类属性转移给父类，配上合适的访问控制符，是解决此问题的方法之一
[/Quote]

[IT小岛]

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public abstract class ClsFather {


/**
* 根据字符串数组中的子类的属性名称，执行invoke设置子类属性值。
* @param aryStr
* @throws InvocationTargetException
* @throws IllegalAccessException
* @throws NoSuchMethodException
*/
protected String[] strMedName = new String[2];
public ClsFather(String[] aryStr) throws
NoSuchMethodException, IllegalAccessException, InvocationTargetException {



for (int i = 0; i < aryStr.length; i++) {
strMedName[i] = aryStr[i];
if (strMedName != null && !strMedName.equals("")) {
// 获得方法名
strMedName[i] = strMedName[i].replaceFirst(
strMedName[i].substring(0, 1), strMedName[i].substring(0, 1).toUpperCase());
// invoke执行方法 setXXXXXX(String)
Method method = this.getClass().getMethod("set" + strMedName[i],new Class[] {String.class});
Object []obj = new Object[] {new String(strMedName[i])};
method.invoke(this, obj);
}
}
}
}
package new1;

import java.lang.reflect.InvocationTargetException;
public class ClsSon extends ClsFather {

private String strName=null;
private String strAge=null;

public ClsSon(String[] aryStr) throws
NoSuchMethodException, IllegalAccessException, InvocationTargetException {

super(aryStr);
this.strAge = super.strMedName[0];
this.strName = super.strMedName[1];
}

public String getStrAge() {
return strAge;
}

public void setStrAge(String strAge) {
this.strAge = strAge;
}

public String getStrName() {
return strName;
}

public void setStrName(String strName) {
this.strName = strName;
}

public static void main(String[] args) throws
NoSuchMethodException, IllegalAccessException, InvocationTargetException {

ClsSon clsSon = new ClsSon (new String[] {"strName","strAge"});

System.out.println(clsSon.getStrAge());
System.out.println(clsSon.getStrName());

}
}

[IT小岛]

我做啦一下修改可以满足你的要求 你把 strName strAge 以参数传到父类 子类是不会受到影响的