我並不是想要在YYYY-MM-DD或dd/MM/YYYY格式化日期。我在詢問LocalDate的字面格式。如何在BlueJ「創建對象」對話框中輸入LocalDate值
我剛開始學習Java,我正在使用這個名爲BlueJ的IDE。我想創建一個測試方法。
現在,因爲從構造我們知道,它需要一個INT,並LOCALDATE雙。我在網上搜索,發現
java.time.LocalDate: A LocalDate instance holds a date without a time zone, in ISO-86011 calendar system. LocalDate has the default format ‘YYYY-MM-DD’ as in ‘2016-12-12’.
所以我把一個正常的數量在10001的testID和雙會像50.5 我也知道,爲它註冊一個字符串(如果需要它)我需要「字符串」
內圍,但我已經試過各種方法,把在日期和我會留下一個錯誤
2018-05-30,30-05 -2018,30/05/2018會給我
Error: incompatible types: Int cannot be converted to java.time.LocalDate
「30/05/2018」,另一方面會給我
Error: Incompatible types: java.lang.String cannot be converted to java.time.LocalDate
如果我嘗試2018年5月30日它會說
Error: ';' expected
如果我嘗試「2018年5月30日」它會說
Error: unclosed character literal
我跑出來試試它的方式。所以如果你能告訴我該如何把它放在那裏,那會很棒。
我只是真的需要知道BlueJ是如何讓我輸入它的。導致BlueJ的資源非常稀少。
代碼:
import java.time.LocalDate;
import java.util.ArrayList;
/**
* Write a description of class TestPaper here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class TestPaper
{
// instance variables - replace the example below with your own
private int testID;
private LocalDate testDate;
private double testMarks;
private ArrayList<MCQ> MCQDetails;
/**
* Constructor for objects of class TestPaper
*/
public TestPaper(int testID, LocalDate testDate, double testMarks)
{
this.testID = testID;
this.testDate = testDate;
this.testMarks = testMarks;
MCQDetails = new ArrayList<MCQ>() ;
}
/**
* Accessor Method getTestID to get the testID
*
* @return int value of the choice ID
*/
public int getTestID(){
return testID;
}
/**
* Mutator Method to set the testID
*
* @param int format of the testID to set
*/
public void setTestID(int testID){
this.testID = testID;
}
/**
* Accessor Method getTestMarks to get the Test Marks
*
* @return double value of the test marks
*/
public double getTestMarks(){
return testMarks;
}
/**
* Mutator Method to set the testMarks
*
* @param String format of the choice Description to be set
*/
public void setTestMarks(double testMarks){
this.testMarks = testMarks;
}
/**
* Accessor Method getTestDate to get the testDate
*
* @return LocalDate value of the testDate
*/
public LocalDate getTestDate(){
return testDate;
}
/**
* Mutator Method to set the testDate
*
* @param LocalDate format of the testDate to set
*/
public void setTestDate(LocalDate testDate){
this.testDate = testDate;
}
/**
* Method addMCQ will allow users to add a MCQ Object to the list of MCQ
*
* @param addMCQ a MCQ Object
* @return boolean will return true if it is successfully added or false if not
*/
public boolean addMCQ(MCQ MCQName)
{
return MCQDetails.add(MCQName);
}
/**
* Method removeMCQ to remove an MCQ object from the Arraylist
*
* @param MCQName A parameter of type MCQ
*/
public void removeMCQ(MCQ MCQName)
{
MCQDetails.remove(MCQName);
}
/**
* Method listMCQ to return a list of MCQ arraylist
*
* @return The return value of MCQDetails (MCQ Arraylist)
*/
public ArrayList<MCQ> listMCQ()
{
return MCQDetails;
}
public MCQ findMCQ(int MCQID)
{
for(MCQ m : MCQDetails)
{
if(m.getQuestionID() == MCQID)
{
return m;
}
}
return null;
}
哪裏是實現所有這些的代碼? – nullpointer
我現在就添加它,它真的只是一個簡單的程序。 –
我不使用bluej,所以不確定它接受什麼樣的表達式。你可以把代碼放在'LocalDate.of(2018,5,30)'嗎?或者一個字符串'「2018-05-30」'(不知道你是否已經試過雙引號)? – 2017-08-25 12:30:35