Programming Articles - Page 2959 of 3366

To extract a substring as an array of characters in Java, use the getChars() method.Let’s say the following is our string and character array.String str = "World is not enough!"; char[] chArr = new char[10];Now, use the getChars() method to extract a substring.str.getChars(13, 19, chArr, 0);The above substring is an array of characters which can be displayed as shown in the complete example below −Example Live Demopublic class Demo {    public static void main(String[] args) {       String str = "World is not enough!";       char[] chArr = new char[10];       str.getChars(13, 19, chArr, ... Read More

To get a string from a subset of the character array elements, use the copyValueOf() method. This method returns a String that represents the character sequence in the array specified.Here is our character array.char[] ch = { 'T', 'E', 'S', 'T', 'I', 'N', 'G'};Now, let us create a string from the subset of the above array elements.String str = String.copyValueOf(ch, 4, 2);Example Live Demopublic class Demo {    public static void main(String[] args) {       char[] ch = { 'T', 'E', 'S', 'T', 'I', 'N', 'G'};       String str = String.copyValueOf(ch, 4, 2);       System.out.println(str);    } }OutputIN

Here is our character array.char[] ch = { 'T', 'E', 'S', 'T', 'I', 'N', 'G'};Create string object from some part of a string using the following String constructor. Through this we are fetching substring “IN” from the character array.String str = new String(ch, 4, 2);Example Live Demopublic class Demo {    public static void main(String[] args) {       char[] ch = { 'T', 'E', 'S', 'T', 'I', 'N', 'G'};       String str = new String(ch, 4, 2);       System.out.println(str);    } }OutputIN

Here is our character array.char[] ch = { 'T', 'E', 'S', 'T'};To create string object from the above character array is quite easy. Add the array to the string parameter as shown below −String str = new String(ch);Example Live Demopublic class Demo {    public static void main(String[] args) {       char[] ch = { 'T', 'E', 'S', 'T'};       String str = new String(ch);       System.out.println(str);    } }OutputTEST

Argument indices allow programmers to reorder the output. Let us see an example.Example Live Demopublic class Demo {    public static void main(String[] args) {       System.out.printf("Before reordering = %s %s %s %s %s %s", "one", "two", "three", "four", "five", "six" );       System.out.printf("After reordering = %6$s %5$s %4$s %3$s %2$s %1$s", "one", "two", "three", "four", "five", "six" );       System.out.printf("Before reordering = %d %d %d", 100, 200, 300);       System.out.printf("After reordering = %2$d %3$d %1$d", 100, 200, 300);    } }OutputBefore reordering = one two three four five six After reordering = ... Read More

To display localized method name in Java, use the ‘B’ conversion character.System.out.printf("Localized month : %TB", d);To display method name in lowercase, use the “%tb”System.out.printf("Localized month : %tB", d);Example Live Demoimport java.util.Date; public class Demo {    public static void main(String[] args) {       Date d = new Date();       System.out.printf("Morning/afternoon indicator: %tp", d);       System.out.printf("Morning/afternoon indicator: %Tp", d);       System.out.printf("Localized month : %tB", d);       System.out.printf("Localized month : %TB", d);    } }OutputMorning/afternoon indicator: pm Morning/afternoon indicator: PM Localized month : November Localized month : NOVEMBERRight justify and left justify values ... Read More

Locale-specific morning/afternoon indicator is the AM/PM marker indicator.Use the ‘p’ conversion character to display AM/PM.System.out.printf("Morning/afternoon indicator: %tp",d);Example Live Demoimport java.util.Date; public class Demo {    public static void main(String[] args) {       Date d = new Date();       System.out.printf("Morning/afternoon indicator: %tp",d);       System.out.printf("Morning/afternoon indicator: %Tp",d);    } }OutputMorning/afternoon indicator: pm Morning/afternoon indicator: PM

To display milliseconds since the epoch, use the ‘Q’ Date and Time conversion specifier.System.out.printf("Milliseconds since epoch = %TQ", d);The above would display milliseconds since.1970-01-01 00:00:00 GMTExample Live Demoimport java.util.Date; public class Demo {    public static void main(String[] args) {       Date d = new Date();       System.out.printf("Nanoseconds = %tN", d);       System.out.printf("Seconds since epoch = %ts", d);       System.out.printf("Milliseconds since epoch = %TQ", d);    } }OutputNanoseconds = 050000000 Seconds since epoch = 1543241478 Milliseconds since epoch = 1543241478050

To display seconds since the epoch, use the ‘s’ Date and Time conversion specifier.System.out.printf("Seconds since epoch = %ts", d);The above would display seconds since.1970-01-01 00:00:00 GMTExample Live Demoimport java.util.Date; public class Demo {    public static void main(String[] args) {       Date d = new Date();       System.out.printf("Nanoseconds = %tN", d);       System.out.printf("Seconds since epoch = %ts", d);    } }OutputNanoseconds = 364000000 Seconds since epoch = 1543241402

To display nanoseconds, use the ‘N’ Date and Time conversion specifier.System.out.printf("Nanoseconds = %tN", d);Example Live Demoimport java.util.Date; public class Demo {    public static void main(String[] args) {       Date d = new Date();       System.out.printf("Nanoseconds = %tN", d);    } }OutputNanoseconds = 092000000