判空工具类

ObjectIsNull.java

package com.example;

import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Date;
import java.util.Map;

/**
 * @author chengyq
 * @date  2021年4月9日
 * @version  V1.0
 */
public class ObjectIsNull {

    public static <T> T requireNonNull(T obj, String message) {
        if (ObjectIsNull.check(obj)) {
            throw new NullPointerException(message);
        }
        return obj;
    }

    private ObjectIsNull() {
    }

    public static boolean check(Object obj) {
        if (obj == null) {
            return true;
        }
        if (obj instanceof CharSequence) {
            return check(obj.toString());
        }
        if (obj instanceof Double) {
            return check((Double) obj);
        }
        if (obj instanceof Integer) {
            return check((Integer) obj);
        }
        if (obj instanceof Long) {
            return check((Long) obj);
        }
        if (obj instanceof Iterable) {
            return check((Iterable<?>) obj);
        }
        if (obj instanceof Map) {
            return check((Map<?, ?>) obj);
        }
        if (obj.getClass().isArray()) {
            return checkArray(obj);
        } else {
            return false;
        }
    }

    public static boolean check(Collection<?> c) {
        return c == null || c.size() <= 0;
    }

    public static boolean check(Iterable<?> iterable) {
        return iterable == null || !iterable.iterator().hasNext();
    }

    public static boolean check(Date date) {
        return date == null;
    }

    public static boolean check(Double db) {
        return db == null || (db >= (-1e-6) && db <= (1e-6));
    }

    public static boolean check(Long long1) {
        return long1 == null || long1 == 0L || long1 == -1L;
    }

    public static boolean check(Integer integer) {
        return integer == null || integer == 0 || integer == -1;
    }

    public static boolean check(String string) {
        return string == null || string.trim().length() <= 0 || "null".equalsIgnoreCase(string.trim());
    }

    public static boolean check(CharSequence cs) {
        return cs == null || check(cs.toString());
    }

    public static boolean check(Map<?, ?> map) {
        return map == null || map.size() <= 0;
    }

    public static boolean checkArray(Object array) {
        return array == null || Array.getLength(array) <= 0;
    }
}