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📜  Java中的 SimpleDateFormat parse() 方法及示例

📅  最后修改于: 2022-05-13 01:55:18.101000             🧑  作者: Mango

Java中的 SimpleDateFormat parse() 方法及示例

SimpleDateFormat 类parse()方法用于从字符串中解析文本以生成日期。该方法从起始位置给定的索引开始解析文本。
句法:

public Date parse(String the_text, ParsePosition position)

参数:该方法有两个参数:

  • the_text :这是String类型,指的是要解析以生成日期的字符串。
  • position :这是ParsePosition对象类型,是指解析的起始索引的信息。

返回值:该方法要么返回从字符串解析的日期,要么返回 Null,以防出错。
下面的程序说明了 SimpleDateFormat 的 parse() 方法的工作:
示例 1:

Java
// Java Code to illustrate parse() method
 
import java.text.*;
import java.util.Calendar;
 
public class SimpleDateFormat_Demo {
    public static void main(String[] args)
        throws InterruptedException
    {
        SimpleDateFormat SDFormat
            = new SimpleDateFormat("MM/ dd/ yy");
 
        try {
            Calendar cal = Calendar.getInstance();
 
            // Use of .parse() method to parse
            // Date From String
            String dt = "10/ 27/ 16";
            System.out.println("The unparsed"
                               + " string is: " + dt);
 
            cal.setTime(SDFormat.parse(dt));
            System.out.println("Time parsed: "
                               + cal.getTime());
        }
        catch (ParseException except) {
            except.printStackTrace();
        }
    }
}


Java
// Java Code to illustrate parse() method
 
import java.text.*;
import java.util.Calendar;
 
public class SimpleDateFormat_Demo {
    public static void main(String[] args)
        throws InterruptedException
    {
        SimpleDateFormat SDFormat
            = new SimpleDateFormat("MM/ dd/ yy");
 
        try {
            Calendar cal = Calendar.getInstance();
 
            // Use of .parse() method to parse
            // Date From String
            String dt = "01/ 29/ 19";
            System.out.println("The unparsed"
                               + " string is: " + dt);
 
            cal.setTime(SDFormat.parse(dt));
            System.out.println("Time parsed: "
                               + cal.getTime());
        }
        catch (ParseException except) {
            except.printStackTrace();
        }
    }
}


输出:
The unparsed string is: 10/ 27/ 16
Time parsed: Thu Oct 27 00:00:00 UTC 2016

示例 2:

Java

// Java Code to illustrate parse() method
 
import java.text.*;
import java.util.Calendar;
 
public class SimpleDateFormat_Demo {
    public static void main(String[] args)
        throws InterruptedException
    {
        SimpleDateFormat SDFormat
            = new SimpleDateFormat("MM/ dd/ yy");
 
        try {
            Calendar cal = Calendar.getInstance();
 
            // Use of .parse() method to parse
            // Date From String
            String dt = "01/ 29/ 19";
            System.out.println("The unparsed"
                               + " string is: " + dt);
 
            cal.setTime(SDFormat.parse(dt));
            System.out.println("Time parsed: "
                               + cal.getTime());
        }
        catch (ParseException except) {
            except.printStackTrace();
        }
    }
}
输出:
The unparsed string is: 01/ 29/ 19
Time parsed: Tue Jan 29 00:00:00 UTC 2019