Student Class:
package com.iden.reflection;
public class Student {
private String name;
private int score;
public Student() {
name = "N/A";
}
public Student(String name, int score) {
this.name = name;
this.score = score;
}
public void setName(String name) {
this.name = name;
}
public void setScore(int score) {
this.score = score;
}
public String getName() {
return name;
}
public int getScore() {
return score;
}
public void showData() {
System.out.println("name: " + name);
System.out.println("score: " + score);
}
}
InvokeMethodDemo Class 調用Student object實作方法:
package com.iden.reflection;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class InvokeMethodDemo {
private static String className;
public static void main(String[] args) {
//動態載入與呼叫方法
try {
if(args.length == 0)
className = "com.iden.reflection.Student";
else
className = args[0];
Class c = Class.forName(className);//呼叫Class
Object targetObj = c.newInstance();//動態實作物件
Class[] param1 = {String.class};
Method setName = c.getMethod("setName", param1);//指定物件的方法
Object[] paramObjs1 = {"caterpillar"};
setName.invoke(targetObj, paramObjs1);//將參數帶入方法
Class[] param2 = {Integer.TYPE};
Method setScore = c.getMethod("setScore", param2);
Object[] paramObjs2 = {new Integer(90)};
setScore.invoke(targetObj, paramObjs2);
Method showData = c.getMethod("showData", new Class[0]);
showData.invoke(targetObj, new Object[0]);// call showData method to show name and score.
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
}
}
}
感謝良葛格做了這麼棒的教學。
良葛格範例
