如何在Java

Question

環路動態改變方法名我有一個bean類，我想取MediaContentType0，MediaContentType1，MediaContentType2，MediaContentType3在一個循環 我已經得到JSON字符串，並將其轉換成Java類使用GSON

 Gson gson=new Gson(); 
    CommonBean commonBean=gson.fromJson("JsonString",CommonBean.class) 
    for(int i=0;i<numberOfMedia;i++) 
      { 
    commonBean.getMediaUrl0(); 
    commonBean.getMediaUrl1(); 
    commonBean.getMediaUrl2(); 
    //but i want it to fetch dynamically by iTh element. 
like- 
commonBean.getMediaUrl+i+(); 

這怎麼可能？請建議。由於 }

mybean class is following :- 
public class CommonBean { 
public String to; 
public String from; 
public String body; 
public String numMedia; 
public String MediaContentType0 ; 
public String MediaContentType1 ; 
public String MediaContentType2 ; 
public String MediaContentType3; 
public String getTo() { 
    return to; 
} 
public void setTo(String to) { 
    this.to = to; 
} 

public String getFrom() { 
    return from; 
} 
public void setFrom(String from) { 
    this.from = from; 
} 
public String getBody() { 
    return body; 
} 
public void setBody(String body) { 
    this.body = body; 
} 
public String getNumMedia() { 
    return numMedia; 
} 
public void setNumMedia(String numMedia) { 
    this.numMedia = numMedia; 
} 
public String getMediaContentType0() { 
    return MediaContentType0; 
} 
public void setMediaContentType0(String mediaContentType0) { 
    MediaContentType0 = mediaContentType0; 
} 
public String getMediaContentType1() { 
    return MediaContentType1; 
} 
public void setMediaContentType1(String mediaContentType1) { 
    MediaContentType1 = mediaContentType1; 
} 
public String getMediaContentType2() { 
    return MediaContentType2; 
} 
public void setMediaContentType2(String mediaContentType2) { 
    MediaContentType2 = mediaContentType2; 
} 
public String getMediaContentType3() { 
    return MediaContentType3; 
} 
public void setMediaContentType3(String mediaContentType3) { 
    MediaContentType3 = mediaContentType3; 
} 
} 

請建議如何動態地使用getter方法獲取這些元素？

Answer 1

您可以使用Java Reflection API

for(int i=0;i<numberOfMedia;i++) { 
    try { 
    Method getterMethod = commonBean.getClass().getMethod("getMediaUrl"+i); 
    getterMethod.invoke(commonBean); 
    } catch(Exception e) {} 
}