// 步骤 4:测试代码publicstaticvoidmain(String[]args){IntegertestNumber1=null;// 测试用例1,number 为 nullIntegertestNumber2=10;// 测试用例2,number 不为 nullcheckInteger(testNumber1);// 验证用例1checkInteger(testNumber2);// 验证用例2}publicstaticvoidcheckInteger(Integernumber){if(number==null...
*/publicstaticbooleancheck(finalinti,final@CheckForNullString subject,final@CheckForNullString error){if(MIN_VALUE <= i && i <= MAX_VALUE)returntrue;finalStringBuilder message =newStringBuilder();if(null!= subject) message.append(subject).append(": ");if(null!= error) message.append(error)....
In Java, the primitive data typeintcannot be assigned a value ofnullbecause it is a value type, not an object. However, situations may arise where the need arises to represent the absence of a value for an integer-like entity. Why Is It Important to Know ifIntegerIs Null?
在本文中,以检查一个整数是否为正数为例,可以使用如下代码进行检查: if(datainstanceofInteger){intvalue=(int)data;if(value>0){returntrue;}}else{thrownewIllegalArgumentException("输入数据类型不正确");} 1. 2. 3. 4. 5. 6. 7. 8. 首先,判断输入参数data是否为整数类型,如果不是,则抛出异常并显示...
Sincenullis not an acceptable value for primitives likeint, we should prefer them over their wrapper counterparts likeIntegerwherever possible. Consider two implementations of a method that sums two integers: Now let’s call these APIs in our client code: ...
"threshold-high", required =false) Integer thresholdHigh, @RequestParam(value = "threshold-medium", required =false) Integer thresholdMedium, @RequestParam(value = "threshold-low", required = false) Integer thresholdLow, @RequestParam(value = "threshold-info", required = false) Integer threshold...
}publicvoidsetCode(Integer code) {this.code= code; }publicStringgetMsg() {returnmsg; }publicvoidsetMsg(Stringmsg) {this.msg= msg; } } ↓展开↓ 4. 使用示例 copy@RequestMapping("update")@CheckNull({"id","name"})// 当然支持多个参数public ResultInfo update (User user){userService.update...
* *@authorjiangliang *@since2021/1/815:29*/publicclassUser{@CheckRule(msg ="名称不能为空")@CheckRule(min =1,max =30,msg ="姓名长度1到30个字符")privateString name;@CheckRule(msg ="年龄不能为空")@CheckRule(min =0,max =100,msg ="年龄范围是0到100岁")privateInteger age;// 省略...
Gsongson=newGsonFireBuilder().createGson();SimpleIterable<Integer>simpleIterable=gson.fromJson("[1,2,3]",newTypeToken<SimpleIterable<Integer>>(){}.getType());//Now simpleIterable allows to iterate on the three integer valuesfor(Integeri:simpleIterable) {///...} ...
"email": null, "invoice_prefix": "C11F7E1", "invoice_settings": { "custom_fields": null, "default_payment_method": null, "footer": null, "rendering_options": null }, "livemode": false, "metadata": { "order_id": "6735" }, "name": null, "next_invoice_sequence": 1, "phone...