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The isAlive() method of the Thread class returns true if the thread is alive, which is anytime after the thread has been started but before it runs to completion.Exampleclass first implements Runnable { public void run() { try { for(int i=0; i
The flush() method of the FileWriter class flushes the contents of the file. You can use this method to truncate a file.Exampleimport java.io.File; import java.io.FileWriter; public class FileTruncate { public static void main(String args[]) throws Exception { File file = new File("myData"); FileWriter fw = new FileWriter(file, false); fw.flush(); System.out.println("File truncated"); } }OutputFile truncated
You can access a plain text using the File class.ExampleLive Demoimport java.io.File; public class ReadFile { public static void main(String[] args) { File f = null; String str = "data.txt"; try { f = new File(str); boolean bool = f.canExecute(); String a = f.getAbsolutePath(); System.out.print(a); System.out.println(" is executable: "+ bool); } catch (Exception e) { e.printStackTrace(); } } }Output C:\Users\data is executable: true
You can sort an array using sort() method of the Arrays class.ExampleLive Demoimport java.util.Arrays; public class MainClass { public static void main(String args[]) throws Exception { int array[] = { 2, 5, -2, 6, -3, 8, 0, -7, -9, 4 }; Arrays.sort(array); printArray("Sorted array", array); int index = Arrays.binarySearch(array, 1); System.out.println("Didn't find 1 @ " + index); int newIndex = -index - 1; array = insertElement(array, 1, newIndex); printArray("With 1 added", array); } ... Read More
You can get the size of a directory with the help of FileUtils.sizeofDirectory(File Name) method of FileUtils class.Exampleimport java.io.File; import org.apache.commons.io.FileUtils; public class Main { public static void main(String[] args) { long size = FileUtils.sizeOfDirectory(new File("C:/Windows")); System.out.println("Size: " + size + " bytes"); } }OutputSize: 2048 bytes
The java.io.File.mkdirs() creates the directory named by this abstract pathname, together with necessary and non-existent parent directories.ExampleLive Demoimport java.io.File; public class Main { public static void main(String[] args) { String directories = "D:\a\b\c\d "; File file = new File(directories); boolean result = file.mkdirs(); System.out.println("Status = " + result); } }OutputStatus = true
The CharMatcher class determines a true or false value for any Java char value, just as Predicate does for any Object.Sr.NoMethods & Description1CharMatcher and(CharMatcher other)Returns a matcher that matches any character matched by both this matcher and other.2static CharMatcher anyOf(CharSequence sequence)Returns a char matcher that matches any character present in the given character sequence.3boolean apply(Character character)Deprecated. Provided only to satisfy the Predicate interface; use matches(char) instead.4String collapseFrom(CharSequence sequence, char replacement)Returns a string copy of the input character sequence, with each group of consecutive characters that match this matcher replaced by a single replacement character.5int countIn(CharSequence sequence)Returns the number of matching ... Read More
The file class provides a method named exists() which returns true if the file specified in the current file object exists.ExampleLive Demoimport java.io.File; public class FileHandling { public static void main(String args[]) { File file = new File("samplefile"); if(file.exists()) { System.out.println("Given file existed"); } else { System.out.println("Given file does not existed"); } } }OutputGiven file does not existed
You can get the list of files in a directory −Create a directory object using the File class.Get the list of directories in it using the getName() method.Exampleimport java.io.File; public class FindingDirectories { public static void main(String args[]) { String dir ="C:/Users/Tutorialspoint/Desktop/movies"; File directory = new File(dir); File[] fileList = directory.listFiles(); for(File file: fileList) { System.out.println(file.getName()); } } }OutputArundhati HD.mp4 Okka Ammai Tappa.mkv Padamati Sandhya Ragam.mp4
The println() terminates the current line by writing the line separator string. The print() method just prints the given content.ExampleLive Demopublic class Sample { public static void main(String args[]) { System.out.println("Hello"); System.out.println("how are you"); System.out.print("Hello"); System.out.print("how are you"); } }OutputHello how are you Hellohow are you