java 通过反射遍历所有字段修改值的实例代码

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class ClassUtil {
   
    private  final Logger logger = LoggerFactory.getLogger(getClass());

    /**
     * 通过反射所有字段，带有图片的字段，重新赋值
     *
     * @param obj 对象
     */
    public void setImageValue(Object obj) {
        try {
            Class aClass = obj.getClass();
            Field[] fields = aClass.getDeclaredFields();
            for (Field field : fields) {
                PropertyDescriptor pd = new PropertyDescriptor(field.getName(),
                        aClass);
                // 获取get方法
                Method getMethod = pd.getReadMethod();
                // 获取set方法
                Method setMethod = pd.getWriteMethod();
                // 通过get方法获取到值
                Object o = getMethod.invoke(obj);
                if (o != null) {
                    String s = o.toString();
                    if (s.contains("jpg")) {
                        // 业务操作
                        // 更新为新的值
                        setMethod.invoke(obj, builder.toString());
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 }

  public static void main(String[] args) {
        int Arr[][]={{1,2,3},{4,5,6}};
        for (int i = 0; i < Arr.length; i++) {
            for (int j = 0; j < Arr[i].length; j++) {
                System.out.print(Arr[i][j]+" ");
            }
        }
    }

 int a[] = {1,2,3,4} ;
        for (int element:a){
            System.out.println(element);

        }

  int a[] = {1,2,3,4} ;
        int b[][] = {{3,4},{1,2}};
        System.out.println(Arrays.toString(a));
        System.out.println(Arrays.deepToString(b));