JAVA反射使用示例

原创于 2018-08-08 23:17:13 发布 · 134 阅读

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#反射

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import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

public class HashMapTest {


    public static void main(String[] args) throws Exception {
        Map<String,Object> map = new HashMap<>(32,0.75F);
        System.out.println(getField(map,"threshold"));
        System.out.println(getMethod(map,"isEmpty"));
    }

    private static Object getField(Object obj,String f) throws Exception {
        Field field = obj.getClass().getDeclaredField(f);
        field.setAccessible(true);
        return field.get(obj);
    }
    private static Object getMethod(Object obj,String m,Object ... args) throws Exception {
        Method method = obj.getClass().getDeclaredMethod(m);
        method.setAccessible(true);
        return method.invoke(obj,args);
    }
}