如何比较两个java sql日期，一个在列表中，另一个刚刚输入
我试过这里贴的许多问题。我仍然没有找到解决问题的办法 我想比较用户输入的日期，在我的android应用程序中，我将日期存储在如何比较两个java sql日期，一个在列表中，另一个刚刚输入,java,android,date,Java,Android,Date,我试过这里贴的许多问题。我仍然没有找到解决问题的办法 我想比较用户输入的日期，在我的android应用程序中，我将日期存储在ArrayList中 我不想将克隆存储到已保存的日期，所以我必须检查。我使用JavaSQLDate来避免时间部分 static List<DatefromTo> myList; myList = new ArrayList<Dateclassobject>(); i =myList.size(); for(int j = 1; j <= my
ArrayListstatic List<DatefromTo> myList;
myList = new ArrayList<Dateclassobject>();
i =myList.size();
for(int j = 1; j <= myList.size(); j ++){
int results2 = myList.get(i).datefrom.compareTo(myList.get(j).datefrom);
if(results2 > 0 ){
Toast.makeText(getApplicationContext(),"First Date is after second",Toast.LENGTH_LONG).show();
}else if(results2 < 0){
Toast.makeText(getApplicationContext(), "Wrong", Toast.LENGTH_LONG).show();
}else if(results2 == 0){
Toast.makeText(getApplicationContext(),String.valueOf(myList.get(i).datefrom) + "------" + String.valueOf(myList.get(j).datefrom),Toast.LENGTH_LONG).show();
}else{
Toast.makeText(getApplicationContext(), "Hi", Toast.LENGTH_LONG).show();
}
}
import java.sql.Date;
import java.util.ArrayList;
import java.util.Calendar;
//import java.util.Date;
import java.util.List;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
import android.widget.Toast;
public class DateAdd extends Activity {
private Button buttonsubmit;
DatePickerDialog dpdfrom, dpdto;
Date dtFrom, dtTo;
long milisto, milisfrom, days, diff;
int i;
Button delete;
TableLayout stk;
TextView tvadd, tvadd2, tvadd3, tvfrompick, tvtopick, t1v;
String abc;
DatefromTo datefromto, dtFT;
int listSize;
int mYearfrom, mMonthfrom, mDayfrom, mYearto, mMonthto, mDayto;
static List<DateClassObject> myList;
Calendar from; // get the from date from user and store here
Calendar to; // get the to date from user and store here
EditText et;
String datetoday, difference, string1, string2;
Long bringto, bringfrom, between;
boolean wrong;
boolean entryremover;
// boolean yrfm , mnfm , dyfm , yrto , mnto , dyto;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dateadd);
from = Calendar.getInstance();
to= Calendar.getInstance();
final Calendar c = Calendar.getInstance();
mYearfrom = c.get(Calendar.YEAR);
mMonthfrom = c.get(Calendar.MONTH);
mDayfrom = c.get(Calendar.DAY_OF_MONTH);
mYearto = c.get(Calendar.YEAR);
mMonthto = c.get(Calendar.MONTH);
mDayto = c.get(Calendar.DAY_OF_MONTH);
buttonsubmit = (Button) findViewById(R.id.buttonsubmit);
et = (EditText) findViewById(R.id.et);
// tvspecial = (TextView) findViewById(R.id.tvspecial);
tvfrompick = (TextView) findViewById(R.id.tvfrompick);
tvtopick = (TextView) findViewById(R.id.tvtopick);
myList = new ArrayList<DateClassObject>();
i = (myList.size()-1);
init();
if (entryremover == true) {
delete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
myList.remove(dtFT);
}
});
}
buttonsubmit.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dtFT = new DatefromTo(from,to);
if(from.before(to)){
myList.add(dtFT);
AddEntry();
}
for(int j = 0; j < myList.size(); j ++){ //Note. you've written,
//for(int j = 1; j <= myList.size(); j ++) , ArrayList index start from 0. you'll miss the first element. I hope it helps you in the future
Calendar dateFrom = myList.get(j).dateFrom;
Calendar dateTo = myList.get(j).dateTo;
if(isSameDay(from, dateFrom) && isSameDay(to, dateTo)){ // checking same period allready exists
Toast.makeText(getApplicationContext(),
"Already exist",
Toast.LENGTH_LONG).show();
}
else{
// if it does not exists, I assume that you want to add it your arrayList
myList.add(new DatefromTo(from, to));
}
t1v.setText((myList.get(j).dateFrom
+ "\n" + myList.get(j).dateTo + "\n"));
}
tvfrompick.setText("");
tvtopick.setText("");
}
});
tvfrompick.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dpdfrom.show();
}
});
tvtopick.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dpdto.show();
}
});
dpdfrom = new DatePickerDialog(this,
new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
tvfrompick.setText(dayOfMonth + "-" + monthOfYear + 1
+ "-" + year);
mDayfrom = dayOfMonth;
mMonthfrom = (monthOfYear);
mYearfrom = year;
// dtFrom = new Date(mYearfrom - 1900, mMonthfrom,mDayfrom);
from.set(mYearfrom, mMonthfrom,
mDayfrom);
}
}, mYearfrom, mMonthfrom, mDayfrom);
dpdto = new DatePickerDialog(this,
new DatePickerDialog.OnDateSetListener() {
@SuppressWarnings({ "deprecation", "deprecation" })
@Override
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
tvtopick.setText(dayOfMonth + "-" + monthOfYear + 1
+ "-" + year);
mDayto = dayOfMonth;
mMonthto = (monthOfYear);
mYearto = year;
// dtTo = new Date((mYearto - 1900), mMonthto, mDayto);
to.set( mYearto, mMonthto, mDayto);
}
}, mYearto, mMonthto, mDayto);
}
public boolean isSameDay(Calendar cal1, Calendar cal2) {
if (cal1 == null || cal2 == null) {
throw new IllegalArgumentException("null");
}
return (cal1.get(Calendar.ERA) == cal2.get(Calendar.ERA) &&
cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR) &&
cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR));
}
public void init() {
stk = (TableLayout) findViewById(R.id.table_main);
TableRow tbrow0 = new TableRow(this);
TextView tv0 = new TextView(this);
tv0.setText("From");
tv0.setTextColor(Color.WHITE);
tv0.setPadding(20, 10, 20, 10);
tbrow0.addView(tv0);
TextView tv1 = new TextView(this);
tv1.setText(" To " + myList.size());
tv1.setTextColor(Color.WHITE);
tv1.setPadding(20, 10, 20, 10);
tv1.getPaddingLeft();
tbrow0.addView(tv1);
// Button tv2 = new Button(this);
// tv2.setText("Delete ");
// tv2.getPaddingLeft();
// //tv2.setTextColor(Color.WHITE);
// tbrow0.addView(tv2);
stk.addView(tbrow0);
}
public void AddEntry() {
entryremover = true;
TableRow tbrow = new TableRow(this);
t1v = new TextView(this);
// t1v.setText("From" + i);
myList.get(myList.size() - 1);
t1v.setTextColor(Color.WHITE);
t1v.setGravity(Gravity.CENTER);
t1v.setPadding(20, 10, 20, 10);
tbrow.addView(t1v);
delete = new Button(this);
delete.setText("Delete");
delete.setTextColor(Color.WHITE);
delete.setGravity(Gravity.CENTER);
delete.setPadding(20, 10, 20, 10);
tbrow.addView(delete);
stk.addView(tbrow);
}
public void removeEntry() {
}
}
import java.sql.Date；
导入java.util.ArrayList；
导入java.util.Calendar；
//导入java.util.Date；
导入java.util.List；
导入android.app.Activity；
导入android.app.DatePickerDialog；
导入android.graphics.Color；
导入android.os.Bundle；
导入android.view.Gravity；
导入android.view.view；
导入android.view.view.OnClickListener；
导入android.widget.Button；
导入android.widget.DatePicker；
导入android.widget.EditText；
导入android.widget.TableLayout；
导入android.widget.TableRow；
导入android.widget.TextView；
导入android.widget.Toast；
公共类DateAdd扩展活动{
私人按钮提交；
DatePickerDialog dpdfrom，dpdto；
日期dtFrom，dtTo；
长毫米，毫米从，天，不同；
int i；
按钮删除；
表格布局stk；
文本视图tvadd、tvadd2、tvadd3、tvfrompick、tvtopick、t1v；
字符串abc；
DatefromTo-DatefromTo，dtFT；
int列表大小；
int mYearfrom、mMonthfrom、mDayfrom、mYearto、mMonthto、mDayto；
静态列表；
日历起始日期；//从用户处获取起始日期并存储在此处
日历到；//从用户处获取到日期并存储在此处
编辑文本；
字符串datetoday、difference、string1、string2；
长带，从中间带；
布尔错误；
布尔入口移除器；
//布尔yrfm，mnfm，dyfm，yrto，mnto，dyto；
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.dateadd）；
from=Calendar.getInstance（）；
to=Calendar.getInstance（）；
最终日历c=Calendar.getInstance（）；
mYearfrom=c.get（日历年）；
monthfrom=c.get（日历月）；
mDayfrom=c.get（日历、日期、月份）；
mYearto=c.get（日历年）；
monthto=c.get（日历月）；
mDayto=c.get（日历日/月）；
ButtonsSubmit=（Button）findViewById（R.id.ButtonsSubmit）；
et=（EditText）findViewById（R.id.et）；
//TVSecial=（TextView）findViewById（R.id.TVSecial）；
tvfrompick=（TextView）findViewById（R.id.tvfrompick）；
tvtopick=（TextView）findViewById（R.id.tvtopick）；
myList=新的ArrayList（）；
i=（myList.size（）-1）；
init（）；
if（entryremover==true）{
delete.setOnClickListener（新的OnClickListener（）{
@凌驾
公共void onClick（视图v）{
myList.remove（dtFT）；
}
});
}
ButtonsSubmit.setOnClickListener（新的OnClickListener（）{
@凌驾
公共void onClick（视图v）{
dtFT=新日期fromto（from，to）；
如果（从之前到）{
myList.add（dtFT）；
加法（）；
}
对于（int j=0；jbuttonsubmit.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(from.before(to)){
boolean alreadyExists = false;
for(int j = 0; j < myList.size(); j ++){
Calendar dateFrom = myList.get(j).dateFrom;
Calendar dateTo = myList.get(j).dateTo;
if(isSameDay(from, dateFrom) && isSameDay(to, dateTo)){ // checking same period allready exists
alreadyExists = true;
break;
}
}
if (alreadyExists){
Toast.makeText(getApplicationContext(),
"Already exist",
Toast.LENGTH_LONG).show();
}
else{
myList.add(new DateClassObject(from, to));
}
}
tvfrompick.setText("");
tvtopick.setText("");
}
});
buttonsubmit.setOnClickListener（新的OnClickListener（）{
@凌驾
公共void onClick（视图v）{
如果（从之前到）{
布尔值alreadyExists=false；
对于（int j=0；j
至于您在代码中编写的删除按钮myList.remove（dtFT）；
。删除方法将数组列表中的位置作为参数（整数值）。myList.remove（2）
从列表中删除第二个元素。因此，找出一些方法来获取要删除的元素的位置。这是一个艰难的过程
首先，该类确实有一天中的某个时间，但假装没有。作为java.util.Date的子类，它继承了一天中的某个时间，但将该时间设置为零值（您可以将其视为午夜）。引用文档：
为了符合SQL日期的定义，必须通过将小时、分钟、秒和毫秒设置为零来“规范化”java.SQL.DATE实例包装的毫秒值
此外，一天中的时间是UTC时区，所以如果你比较一个地区的日期时间值，比如说Montréal，那么你就有问题了
这些只是避免使用java.util.Date/.Calendar、java.sql.Date和SimpleDataFormat类的几个原因。它们是与java捆绑的库中最薄弱的领域之一
半开
处理时间跨度的一个关键想法
List<DateClassObject> myList = new ArrayList<>();
Calendar from = // get the from date from user and store here
Calendar to = // get the to date from user and store here
//to check 'from' is after 'to'
if(from.after(to)){
// Do your operation
}
for(int j = 0; j < myList.size(); j ++){ //Note. you've written, for(int j = 1; j <= myList.size(); j ++) , ArrayList index start from 0. you'll miss the first element. I hope it helps you in the future
Calendar dateFrom = myList.get(j).dateFrom;
Calendar dateTo = myList.get(j).dateTo;
if(isSameDay(from, dateFrom) && isSameDay(to, dateTo)){ // checking same period allready exists
// if it exists Do operation
}
else{
// if it does not exists, I assume, you want to add DateClassObject to your arrayList
myList.add(new DateClassObject(from, to));
}
}
public boolean isSameDay(Calendar cal1, Calendar cal2) {
if (cal1 == null || cal2 == null) {
throw new IllegalArgumentException("The dates must not be null");
}
return (cal1.get(Calendar.MONTH) == cal2.get(Calendar.MONTH) &&
cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR) &&
cal1.get(Calendar.DAY_OF_MONTH) == cal2.get(Calendar.DAY_OF_MONTH));
}
public class DateClassObject {
public Calendar dateFrom;
public Calendar dateTo;
public Date difference;
public DateClassObject(Calendar dateFrom, Calendar dateTo) {
this.dateFrom = dateFrom;
this.dateTo = dateTo;
}
}
int day = datePicker.getDayOfMonth();
int month = datePicker.getMonth();
int year = datePicker.getYear();
Calendar from = Calendar.getInstance();
from.set(year, month, day);
buttonsubmit.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(from.before(to)){
boolean alreadyExists = false;
for(int j = 0; j < myList.size(); j ++){
Calendar dateFrom = myList.get(j).dateFrom;
Calendar dateTo = myList.get(j).dateTo;
if(isSameDay(from, dateFrom) && isSameDay(to, dateTo)){ // checking same period allready exists
alreadyExists = true;
break;
}
}
if (alreadyExists){
Toast.makeText(getApplicationContext(),
"Already exist",
Toast.LENGTH_LONG).show();
}
else{
myList.add(new DateClassObject(from, to));
}
}
tvfrompick.setText("");
tvtopick.setText("");
}
});
LocalDate earliest = new LocalDate( 2015 , 6 , 1 );
LocalDate latest = new LocalDate( 2015 , 7 , 1 );
LocalDate inputLocalDate = new LocalDate( 2015 , 5 , 15 );
if ( inputLocalDate.isBefore( earliest ) ) {
earliest = inputLocalDate ; // Extend left-side of date range to earlier date.
} else if ( inputLocalDate.isAfter( latest ) ) {
latest = inputLocalDate ; // Extend right-side of date range to later date.
} else {
// Else the input date is within the date range, inclusive ( Closed range '[]', rather than Half-Open '[)` ).
}