java根据传入参数不同调用不同的方法，求高手支妙招！

if (逻辑条件判断)
{
　　语句块
}else if(逻辑条件判断){
}else{
}

public class A{//定义一个类A
   public void s1(){//定义方法s1
   }
   public void s2(){//定义方法s2
   }
   public void s3(){//定义方法s3
   }
   public void show(int a){//定义一个方法show
      if(a==1){//如果a等于1
         s1();//调用方法s1
      }else if(a==2){
         s2();//调用方法s2
      }else{
         s3();//调用方法s3
      }
   }
}

public class Test {
    public void method1() {
        System.out.println("method1() invoked");
    }

    public void method2() {
        System.out.println("method2() invoked");
    }

    public void method3() {
        System.out.println("method3() invoked");
    }

    public void invokeMethod(String methodName) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        Test.class.getMethod(methodName,null).invoke(this,null);
    }

    public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
         new Test().invokeMethod("method2");
    }

}

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