Java之反射机制三：获取类的方法

package reflex;
public class BigDog extends Dog {
    private Integer age;

    public String name;

    public BigDog(){}

    private void getDog(){}

    private BigDog(Integer age, String name) {
        this.age = age;
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "BigDog{" +
                "age=" + age +
                ‘}‘;
    }
}

Class<BigDog> dogClass = BigDog.class;
Method[] methods = dogClass.getMethods();
for (Method method : methods) {
       System.out.println(method);
}

Method[] declaredMethods = dogClass.getDeclaredMethods();
 for (Method declaredMethod : declaredMethods) {
        System.out.println(declaredMethod);
 }

        Class<BigDog> dogClass = BigDog.class;
        //获取该类的公有构造方法
        Constructor<?>[] constructors = dogClass.getConstructors();
        for (Constructor<?> constructor : constructors) {
            System.out.println(constructor);
        }
        //获取该类所有的构造方法（包括有参无参，私有共有）
        Constructor<?>[] declaredConstructors = dogClass.getDeclaredConstructors();
        for (Constructor<?> declaredConstructor : declaredConstructors) {
            System.out.println(declaredConstructor);
        }

//获取该类公有的有参构造方法
Constructor<BigDog> constructor = dogClass.getConstructor(Integer.class);
System.out.println(constructor);

//获取该类私有的有参构造方法
Constructor<BigDog> declaredConstructor = dogClass.getDeclaredConstructor(Integer.class, String.class);
System.out.println(declaredConstructor);

//获取ArrayList的add方法
Class<ArrayList> clazz = ArrayList.class;
Method method = clazz.getMethod("add", int.class, Object.class);
System.out.println(method);

//获取类的指定私有方法
Class<Object> clazz = Object.class;
Method method = clazz.getDeclaredMethod("registerNatives");
System.out.println(method);