convert datetime to custom format in java 8

ByAnurag batra October 4, 2022September 6, 2022

DateTimeFormatter oldPattern = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
DateTimeFormatter newPattern = DateTimeFormatter.ofPattern("yyyy-MM-dd");

LocalDateTime datetime = LocalDateTime.parse(input, oldPattern); 
String output = datetime.format(newPattern);

Here is what the above code is Doing:
1. Create a DateTimeFormatter object with the old pattern.
2. Create a DateTimeFormatter object with the new pattern.
3. Parse the input string using the old pattern.
4. Format the parsed date using the new pattern.

Java Examples

logging to a file log4j

ByAnurag batra October 3, 2022September 6, 2022

// How to log to a file using log4j : String filePath = “D:/Logs/MyFirstLog.log”; PatternLayout layout = new PatternLayout(“%-5p %d %m%n”); RollingFileAppender appender = new RollingFileAppender(layout, filePath); appender.setName(“MyFirstLog”); appender.setMaxFileSize(“20MB”); appender.activateOptions(); logger.addAppender(appender); logger.info(“this will be printed in the provided log file”); Here is what the above code is Doing: 1. Create a PatternLayout object. This object…

Java Examples

android ask if system is in dark mode

ByAnurag batra September 17, 2022September 6, 2022

switch (getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK) { case Configuration.UI_MODE_NIGHT_YES: //process break; case Configuration.UI_MODE_NIGHT_NO: // process break; } Here is what the above code is Doing: 1. We are getting the current configuration of the device. 2. We are getting the current UI mode of the device. 3. We are checking if the UI mode is night mode…

Java Examples

Algorithms – Max value

ByAnurag batra October 11, 2022September 6, 2022

public int max(List numbers) { int max = Integer.MIN_VALUE; for (Integer n: numbers) { if (n > max) { max = n; } } return max; } Here is what the above code is Doing: 1. We’re creating a variable called max and setting it to the lowest possible integer value. 2. We’re looping through…

Java Examples

how to open an activity from a fragment

ByAnurag batra October 4, 2022September 6, 2022

Button btn1 = (Button) thisLayout .findViewById(R.id.btnDb1); btn1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Intent intent = new Intent(getActivity(), otherActivity.class); ((MainActivity) getActivity()).startActivity(intent); } }); return thisLayout; } Here is what the above code is Doing: 1. It’s creating a new layout object, and inflating the layout file. 2. It’s…

Java Examples

java to python

ByAnurag batra September 17, 2022September 6, 2022

package myproject; import java.util.Scanner; public class SEGP { public static void main(String[] args) { int n,j=0; Scanner sc=new Scanner(System.in); n=sc.nextInt(); int a[]=new int[n+1]; int b[] = new int[n]; for(int i=0;i

navigate from one fragment to another android

Java Examples

navigate from one fragment to another android

ByAnurag batra October 4, 2022September 6, 2022

Fragment fragment = new tasks(); FragmentManager fragmentManager = getActivity().getSupportFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); fragmentTransaction.replace(R.id.content_frame, fragment); fragmentTransaction.addToBackStack(null); fragmentTransaction.commit(); Here is what the above code is Doing: 1. Create a new instance of the fragment you want to switch to. 2. Get the FragmentManager and start a transaction. 3. Replace whatever is in the fragment_container view with…

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