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Please tell me any method or logic to precede characters alphabetically (i.e., get the alphabetic predecessor of a character) eg. predecessor of a is b. I have searched the net but found nothing. Any help would be appreciated.
If you are asking how to get 'a' from 'b', it's quite simple :
char x = 'b';
x--;
System.out.println(x); // prints a
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I have a String value "\u0004"
I need to convert it to character '\u0004'
I need to store this character back to the string.
How can this be done?
Maybe this is answer you want
// string value that has "\" in front
String s = "\\u0004";
// substring to leave "\u" out
char c = (char)Integer.parseInt(s.substring(2));
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I had requirement to validate 5 digit String with - at third position.
For example i want to validate number like these 12-18 ,20-35,40-45.I need java string for the same
you can use the regex
^\d{2}-\d{2}$
to match , see the regex101 demo
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I have a file "file.txt" in Java. In the file I have the following values:
10 10
3 3 W
MMMMMRM
4 4 R
LRLRLML
I want to read each line and with each character I want to assign them to a variable which I will use for calculation.
Any idea with how I can proceed with?
Thanks
1) You can use a BufferedReader with the readLine() method to read each line.
2) Then you can use split() for each word or toCharArray() for each character.
3) Then assign said character to predefined variables.
It would be helpful if we could see what you've tried so far or if you could give more details on what you are trying to accomplish.
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The user input will only be accepted when,
Only upper case letters 'X','O','D','L','E' are present in the user input.
Any amount of 'O's only when in between 'D's
'DLE' is at the end and not by itself.
'X' counts as anything.
So for example the user input: 'DDLE', 'DOODLE', 'XXXDODOOOODLEDLX' - will work.
But these examples will not work ("error, wrong input"): 'DLE','DOOODLLE' 'DLEDOD'
based on criteria and examples provided
^(?=.+[DX][LX][EX]$)(?!.*[^DO]O+[^DO])[XODLE]+$
^(?=.+[DX][LX][EX]$)(?!.*[^DO]O+)(?!.*O+[^DO])[XODLE]+$
Demo
or depends on your interpretation of "'X' counts as anything" - meaning DOODDLEX is valid
^(?=.+[DX][LX][EX]X*$)(?!.*[^DO]O+[^DO])[XODLE]+$
^(?=.+[DX][LX][EX]X*$)(?!.*[^DO]O+)(?!.*O+[^DO])[XODLE]+$
or as suggested below
^(?=.+[DX][LX][EX]X*$)(?!.*[^DOX]O+)(?!.*O+[^DOX])[XODLE]+$
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int [ ] a;
What is happening in this line can anybody describe. It has spaces between [].
You are defining a reference to an array which is presently null, and therefore of undefined size.
This is correct syntax. The spaces in between square brackets are not relevant.
Here is some proper further usage:
int [] a = new int[10];