我正在初始化两个整数a和b。
a编译正常，但b存在错误。
public class Main_1 {
public static void main(String[] args) {
int a = -2147483648; //Working fine
int b = -(2147483648); //Compilation error: The literal 2147483648 of type int is out of range
}
}
为什么会这样？
答案 0 :(得分：50)
原因是int数据类型的有效值在[-2147483648, 2147483647]范围内。
当您将2147483648括在括号内时，它将成为一个将被评估为int的表达式。但是，2147483648太大而无法容纳int（太大一个）。
问题不会发生在-2147483648上，因为它是有效的int值。
JLS的相关部分：
2147483648等整数文字被视为int（section 3.10.1）
如果整数文字的后缀为ASCII字母
long或L（ell），则其类型为l;否则它是int类型（§4.2.1）。
答案 1 :(得分：11)
int值从2147483647变为-(2147483648)。所以int是OutOfRange，因为括号内的值被评估为Integer.MAX_VALUE //Which is equals to 2147483647
。您可以放入括号中的最大值是
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答案 2 :(得分：7)
编译错误很明显：您正在使用超出范围的int文字。如果您真的想这样做，可以使用long字面值：
int b = (int) -(2147483648L);
或double文字：
int b = (int) -(2147483648.0);
答案 3 :(得分：4)
int的最大值为mysqld -u root -p，int的最小值为2147483647。但是当你将-2147483648放入大括号时，它最初会被视为2147483648，并且它对于愤怒无效。
答案 4 :(得分：3)
可视化的一个好方法是将(int) -(2147483648)视为：
(int) -1 * (2147483648)
当编译器评估它时，它说，我必须首先将括号中的数字转换为整数，然后将其乘以负数1.然后继续对数字进行范围检查并发现它大于整数（2147483648）可以容纳的值，这是编译错误。
答案 5 :(得分：1)
function PaymentOnLoad() {
setTimeout(attachEventToGrid, 2500);
if (crmForm.ObjectId != null) {
var PaymentAmount = Xrm.Page.getAttribute("new_accountpaymentamount").getValue();
var OSAmount = CalcOutstandingPaymentAmount(crmForm.ObjectId);
Xrm.Page.getAttribute("new_remainingamount").setValue(parseFloat(eval(rounddec(OSAmount))));
if ((PaymentAmount != null) && (OSAmount - PaymentAmount != 0)) {
Xrm.Page.ui.controls.get("new_paymentamount").setDisabled(true);
}
}
}
function rounddec(value) {
return Math.round(value * 100) / 100;
}
function attachEventToGrid() {
// Attach a refresh event to the PaymentAllocations grid
var targetgrid = document.getElementById("PaymentAllocations");
if (targetgrid) {
if (targetgrid.control.add_onRefresh != undefined) {
targetgrid.control.add_onRefresh(ReLoad);
}
else {
targetgrid.attachEvent("onrefresh", ReLoad);
}
}
else {
setTimeout(attachEventToGrid, 2500);
}
}
function PaymentAllocationOnLoad() {
OnPaymentTypeSelection();
if (Xrm.Page.getAttribute("new_payment").getValue()[0] != null) {
var OSPaymentAmount = CalcOutstandingPaymentAmount(Xrm.Page.getAttribute("new_payment").getValue()[0].id);
Xrm.Page.getAttribute("new_paymentremainingamount").setValue(parseFloat(eval(OSPaymentAmount)));
if (Xrm.Page.getAttribute("new_invoice").getValue() != null) {
var OSInvoiceAmount = CalcOutstandingInvoiceAmount(Xrm.Page.getAttribute("new_invoice").getValue()[0].id);
Xrm.Page.getAttribute("new_invoiceremainingamount").setValue(parseFloat(eval(OSInvoiceAmount)));
Xrm.Page.ui.controls.get("new_paymentamount").setDisabled(true);
}
}
}
function CalcOutstandingPaymentAmount(paymentid) {
_oService = new FetchUtil(_sOrgName, _sServerUrl);
var sFetchPayment = "<fetch mapping='logical'>" +
"<entity name='new_payment'>" +
"<attribute name='new_paymentamount' />" +
"<attribute name='new_accountpaymentamount' />" +
"<filter type='and'>" +
"<condition attribute = 'new_paymentid' operator='eq' value='" + paymentid + "'/>" +
"</filter>" +
"</entity>" +
"</fetch>";
var fetchResultPayment = _oService.Fetch(sFetchPayment, null);
var sFetch = "<fetch mapping='logical'>" +
"<entity name='new_paymentinvoiceallocation'>" +
"<attribute name='new_allocatedamount' />" +
"<filter type='and'>" +
"<condition attribute = 'new_payment' operator='eq' value='" + paymentid + "'/>" +
"</filter>" +
"</entity>" +
"</fetch>";
var fetchApplication = _oService.Fetch(sFetch, null);
var TotalAmount = 0;
if (fetchResultPayment != null) {
TotalAmount = fetchResultPayment.results[0].attributes.new_accountpaymentamount.value;
}
if ((fetchResultPayment != null) && (fetchApplication != null)) {
for (var i = 0;
i < fetchApplication.results.length;
i++) {
TotalAmount -= fetchApplication.results[i].attributes.new_allocatedamount.value;
}
}
return TotalAmount;
}
数据类型为int。
最小值为32-bit signed two's complement integer
最大值为- 2,147,483,648.(-2^31)