Java SimpleDateFormat |设置 2

Java SimpleDateFormat |设置 1
text.SimpleDateFormat 类的更多方法：

• clone() : Java.text.SimpleDateFormat.clone()创建 SimpleDateFormat 的副本。

Syntax :
public Object clone()
Parameters : 
-------
Return : 
copy of the SimpleDateFormat

Java

// Java Program illustrating
// use of SimpleDateFormat.clone() method
 
import java.text.*;
import java.util.Calendar;
  
public class NewClass
{
    public static void main(String[] args) throws InterruptedException
    {
        // Date Formatter
        SimpleDateFormat geek = new SimpleDateFormat();
 
        // Initializing calendar Object
        Calendar c = Calendar.getInstance();
                 
        // Use of clone() :
       System.out.println("Clone : " + geek.clone());
  
    }
}

输出 ：

Clone : java.text.SimpleDateFormat@a9427c06

• hashCode() : Java.text.SimpleDateFormat.hashCode()返回 SimpleDateFormat 对象的哈希码值。

Syntax :
public int hashCode()
Parameters : 
--------
Return : 
hash code value for the SimpleDateFormat object.

Java

// Java Program illustrating
// use of SimpleDateFormat.hashCode() method
 
import java.text.*;
import java.util.Calendar;
  
public class NewClass
{
    public static void main(String[] args) throws InterruptedException
    {
        // Date Formatter
        SimpleDateFormat geek = new SimpleDateFormat();
 
        // Initializing calendar Object
        Calendar c = Calendar.getInstance();
                 
        // Use of hashCode() :
       System.out.println("Hash Code : " + geek.hashCode());
  
    }
}

输出 ：

Hash Code : -1455260666

• equals(Object obj) : Java.text.SimpleDateFormat.equals(Object obj)比较两个 SimpleDateFormat 对象

Syntax :
public boolean equals(Object obj)
Parameters : 
obj : object to compare with
Return : 
true, if equal ; else false

Java

// Java Program illustrating
// use of SimpleDateFormat.equals() method
 
import java.text.*;
import java.util.Calendar;
  
public class NewClass
{
    public static void main(String[] args)
                throws InterruptedException, ParseException
    {
         
    // Setting formatter 
    SimpleDateFormat geek = new SimpleDateFormat();
 
    geek.applyPattern("MMM");
     
    // Use of equals() : 
    System.out.println("Is equal ? : " +
                      geek.equals(new SimpleDateFormat()));
 
    }
}

输出 ：

Is equal ? : false

• setDateFormatSymbols(DateFormatSymbols newSymbols) : Java.text.SimpleDateFormat.setDateFormatSymbols(DateFormatSymbols newSymbols)设置所需日期格式的日期和时间格式符号。

Syntax :
public void setDateFormatSymbols(DateFormatSymbols newSymbols)
Parameters : 
newSymbols : new format symbols for data and time
Return : 
-------

Java

// Java Program illustrating
// use of DateFormatSymbols() method
 
import java.text.*;
import java.util.*;
 
public class NewClass
{
    public static void main(String[] args) throws InterruptedException, ParseException
    {
 
        DateFormatSymbols format_symb =
                     new DateFormatSymbols(new Locale("en", "US"));
        String[] days = format_symb.getShortWeekdays();
 
        int j = 1;
        for (int i = 1; i < days.length; i++)
        {
 
            System.out.print("Day" + j++ + " : " + days[i] + "\n");
        }       
    }
}

输出 ：

Day1 : Sun
Day2 : Mon
Day3 : Tue
Day4 : Wed
Day5 : Thu
Day6 : Fri
Day7 : Sat

• getDateFormatSymbols() : Java.text.SimpleDateFormat.getDateFormatSymbols()返回日期和时间格式符号的副本。

Syntax :
public DateFormatSymbols getDateFormatSymbols()
Parameters : 
-------
Return : 
date and time format symbols.

Java

// Java Program illustrating
// use of getDateFormatSymbols() method
 
import java.text.*;
import java.util.*;
 
public class NewClass
{
    public static void main(String[] args)
                   throws InterruptedException, ParseException
    {
        SimpleDateFormat geeks = new SimpleDateFormat();
 
        String g_date = geeks.format(new Date());
         
        // Use of getDateFormatSymbols () :
        System.out.println("" + geeks.getDateFormatSymbols());
        System.out.println("Date : " + g_date);
    }
}

输出 ：

java.text.DateFormatSymbols@f86e64e0
Date : 6/24/17 12:49 PM

• applyLocalizedPattern(String str) : Java.text.SimpleDateFormat.applyLocalizedPattern(String str)将给定的本地化字符串模式应用于日期格式。

Syntax :
public void applyLocalizedPattern(String str)
Parameters : 
str : string pattern set to new date and time format
Return : 
-------

Java

// Java Program illustrating
// use of applyLocalizedPattern() method
  
import java.text.*;
import java.util.Calendar;
  
public class NewClass
{
    public static void main(String[] args)
                                throws InterruptedException
    {       
        SimpleDateFormat geek = new SimpleDateFormat();
        // Initializing calendar Object
        Calendar c = Calendar.getInstance();
  
        // Using 'arg' pattern
        String arg = "MM / dd / yy  HH:mm Z";
  
        // Use of applyLocalizedPattern()
        geek.applyLocalizedPattern(arg);
 
     System.out.println("Use of applyLocalizedPattern()
                             : "+geek.toLocalizedPattern());
    }
}

输出 ：

Use of applyLocalizedPattern() : MM / dd / yy  HH:mm Z