java反射機制動態調用類中方法

public class MethodTest {


public static void main(String[] args) {
try {
System.out.println("調用math類的靜態方cos()");
Method cos = Math.class.getDeclaredMethod("cos", Double.TYPE);
Double cos1 = (Double)cos.invoke(null,new Integer(1));
System.out.println("1的正弦值爲"+cos1);
System.out.println("調用String類的靜態方法equals()");
Method equals = String.class.getDeclaredMethod("equals", Object.class);
Boolean bStrEquals = (Boolean)equals.invoke(new String("我愛我家"), "我愛我家");
System.out.println("字符串是不是我愛我家"+bStrEquals);
} catch (Exception e) {
e.printStackTrace();
} 
}
}