private void buildMonthsList(cmbMonth monthsList) {
for (int monthCount = 0; monthCount < 12; monthCount++)
monthsList.addItem(Const.MONTHS[monthCount]);
}
public boolean DaysComboBox (int year)
{
Calendar cal = Calendar.getInstance();
int months = cal.get(Calendar.MONTH);
year = (int) cmbYear.getSelectedItem();
boolean leap = false;
if(year % 4 == 0)
{
if( year % 100 == 0)
{
// year is divisible by 400, hence the year is a leap year
if ( year % 400 == 0)
{
leap = true;
}
else {
leap = false;
}
}
else {
leap = true;
}
}
else {
leap = false;
}
return leap;
}
我在学校里有一个重要的Java Swing程序需要帮助。
如何根据月份和年份（包括leap年）填写天数？我使用了3个单独的组合框，一个组合用于几天，另一个组合用于几个月，另一个组合用于多年。还应该从方法中调用它。
答案 0 :(得分：3)
“最佳”解决方案是利用可用功能。
Java 8+引入了var tablerows = document.getElementById('table').rows.length;
var table = document.getElementById('table');
var cart = document.getElementById('cart');
var subtotal = document.getElementById('subtotal');
var username = document.getElementById('username').innerHTML;
var pricesub = document.getElementById('pricefooter');
// On load cart
window.onload = function wowzers(){
var array = [];
var sum = 0;
// Get Data
var xhr = new XMLHttpRequest();
xhr.open('GET', 'pricing/orders/' + username +'/api', true);
xhr.onload = function(){
var data = JSON.parse(this.response);
if(xhr.status >= 200 && xhr.status < 400){
for(x in data){
for(key in data[x]){
array.push(Number(data[x][key]));
sum+=Number(data[x][key]);
subtotal.innerHTML = sum;
row = cart.insertRow(-1);
// Delete Data
row.addEventListener('click', function deleterow(){
index = this.rowIndex;
$.post('pricing/orders/delete', {
delete_item: index
});
cart.deleteRow(index);
subtotal.innerHTML = sum-Number(cart.rows[index].cells[1].innerHTML);
});
cell1 = row.insertCell(0);
cell2 = row.insertCell(1);
cell3 = row.insertCell(2);
cell1.innerHTML = key;
cell2. innerHTML = data[x][key];
cell3. innerHTML = "<button class='btn btn-danger'>Delete</button>"
}
}
console.log(sum);
}else{
console.log(error)
}
}
xhr.send()
}
//Dynamic Cart
for(x = 0; x < tablerows; x++){
table.rows[x].addEventListener('click', addCartItem);
}
function addCartItem(ev){
var array = [];
var priceData = {};
var sum = 0;
index = this.rowIndex;
equipmentCell = table.rows[index].cells[0];
priceCell = table.rows[index].cells[1];
equipmentName = equipmentCell.innerHTML;
equipmentPrice = priceCell.innerHTML;
// Post Data
$.post('/pricing/orders/' + username + '/api', {
javascript_data: JSON.stringify({[equipmentName]:equipmentPrice})
});
cartrow = cart.insertRow(-1);
// Delete Data
cartrow.addEventListener('click', function deleterow(){
index = this.rowIndex;
subtotal.innerHTML = sum-Number(cart.rows[index].cells[1].innerHTML);
$.post('pricing/orders/delete', {
delete_item: index
});
cart.deleteRow(index);
});
cell1 = cartrow.insertCell(0);
cell2 = cartrow.insertCell(1);
cell3 = cartrow.insertCell(2);
cell1.innerHTML= equipmentName;
cell2.innerHTML = equipmentPrice;
cell3.innerHTML = "<button class='btn btn-danger'>Delete</button>";
// Open Api information
var xhr = new XMLHttpRequest();
xhr.open('GET', 'pricing/orders/' + username +'/api', true);
xhr.onload = function(){
var data = JSON.parse(this.response);
if(xhr.status >= 200 && xhr.status < 400){
for(x in data){
for(y in data[x]){
array.push(Number(data[x][y]));
sum+=Number(data[x][y]);
subtotal.innerHTML = sum;
}
}
}else{
console.log(error);
}
}
xhr.send();
}
API，它取代了基于java.time和Calendar的API
例如，使用YearMonth类的类似内容……
Date将打印...
for (int year = 2010; year <= 2020; year++) {
YearMonth ym = YearMonth.of(year, Month.FEBRUARY);
System.out.println(year + " = " + ym.lengthOfMonth());
}
由此，您可以简单地创建一个新的2010 = 28
2011 = 28
2012 = 29
2013 = 28
2014 = 28
2015 = 28
2016 = 29
2017 = 28
2018 = 28
2019 = 28
2020 = 29
，用所需的值填充并将其应用于ComboBoxModel的实例-有关更多详细信息，请参见How to Use Combo Boxes。