Reflection invoke method

file:DemoClass.java

public class DemoClass {
  private String strMsg;

  public void setMsg(String msg) {
    this.strMsg = msg;
  }

  public String getMsg() {
    return strMsg;
  }

  @Override
  public String toString() {
    return strMsg;
  }
}

file:UseInvoke.java

public class UseInvoke {
  public static void main(String[] args) throws Exception {
    DemoClass demoClass = DemoClass.class.newInstance();

    Method method =
      DemoClass.class.getMethod("setMsg"), String.class);

    // setting up message text.
    method.invoke(demoClass, "demomsg");

    method = DemoClass.class.getMethod("getMsg");
    System.out.println( "getMsg(): " + method.invoke(demoClass) );

    System.out.println( "DemoClass.class.toString(): " + demoClass) );
  }
}

Result of java UseInvoke

実行結果

$ java UseInvoke
getMsg(): demomsg
DemoClass.class.toString(): demomsg

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