java判空工具类

import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;


public class EmptyUtil {
    /**
     * 提供字符串，集合，数组，map等常见对象判空处理
     * 
     * @param obj
     * @return
     */
    @SuppressWarnings("rawtypes")
    public static boolean isEmpty(Object obj) {
        if (obj == null) {
            return true;
        }
        if (obj instanceof String) {
            String str = (String) obj;
            return "".equals(str.trim());
        }
        if (obj instanceof Number) {
            Number num = (Number) obj;
            return num.byteValue() == 0;
        }
        if (obj instanceof Collection) {
            Collection col = (Collection) obj;
            return col.isEmpty();
        }
        if (obj instanceof Map) {
            Map map = (Map) obj;
            return map.isEmpty();
        }
        if (obj.getClass().getSimpleName().endsWith("[]")) {
            List<Object> list = Arrays.asList(obj);
            Object[] objs = (Object[]) list.get(0);
            return objs.length == 0;
        }
        return false;
    }

    /**
     * 提供字符串，集合，数组，map等常见对象判空处理
     * 
     * @param obj
     * @return
     */
    public static boolean isNotEmpty(Object obj) {
        return !isEmpty(obj);
    }

}