Brief introduction: Conversion of string and time format

Conversion of string to time format

-----commonly used methods: 1, stitching the format of the string "Some common methods of string type";

2. SimpleDateFormat format

3. Date format

1, the use of SimpleDateFormat:

1.1 Common methods:

Format (date), formats the given date as a date/time string, and adds the result to the given StringBuffer

Parse (string), parse string literal, generate date type

2. Usage of date:

3. Use of string:

3, output the current time:

Date d = new Date (); Or:

System.out.println (d); System.out.println (New Date ());

4, String type format:

Cahr--charat (index); Returns the char value of the specified index.

String--concat (string); connects the specified string to the end of this string.

Int--indexof (char); Returns the index of the specified string at the first occurrence of this character.

String--indexof (String) returns the index where the specified substring first appears in this string.

Int--length (); Returns the length of this string.

IsEmpty (); Returns true if and only if length () is 0 o'clock.

String[]--split (String), which splits the string according to the given character, string match.

String--tostring (). Returns the object itself (it is already a string).

String--trim (). Returns a copy of the string, ignoring leading and trailing blanks.

5. Enter a time format of "string" to convert it to a date-type time format:

Practice One:

Splits the format of a string to output a string in a specified format
String a = "1990-2-1";
String[] B = a.split ("-");
String da=b[0]+ "Year" +b[1]+ "month" +b[2]+ "Day";
System.out.println (DA);

The--------------output is: February 1, 1990

Exercise two:

　　

Brief introduction: Conversion of string and time format