In this article, we will learn to parse and format a number into binary using Java. Binary representation plays a crucial role, especially when working with low-level operations, data storage, or network communication. Java, a widely used object-oriented programming language, provides several tools to manipulate numbers and convert them into different formats. What is Binary Representation? A binary number is a base-2 numeral system that uses two digits: 0 and 1. Every number in the Decimal System (base-10) can be converted into binary by representing it as a sum of powers of 2.For example − ... Read More

In this article, we use the System.nanoTime() method in Java to get the current value of the system timer in nanoseconds. It returns the current value of the most precise available system timer, in nanoseconds. Problem StatementGiven that you need to get the current value of the system timer in nanoseconds, write a Java program that retrieves this value using the System.nanoTime() method.Input There is no specific input as the program retrieves the system's current time in nanoseconds directly.Output Current Value: 49908709882168 nanoseconds Steps to get the current value of the system timer in nanosecondsThe following are the ... Read More

Use arraycopy() method in Java to copy an array from the specified source array.Here, we have two arrays −int arr1[] = { 10, 20, 30, 40}; int arr2[] = { 3, 7, 20, 30};Now, we will use the arraycopy() method to copy the first two elements of the 1st array to the 2nd array −System.arraycopy(arr1, 0, arr2, 2, 2);The following is an example −Example Live Demoimport java.lang.*; public class Demo { public static void main(String[] args) { int arr1[] = { 10, 20, 30, 40}; int arr2[] = { 3, 7, 20, 30}; System.arraycopy(arr1, 0, arr2, 2, 2); System.out.print("New Array = "); System.out.print(arr2[0] + " "); System.out.print(arr2[1] + " "); System.out.print(arr2[2] + " "); System.out.print(arr2[3] + " "); } }OutputNew Array = 3 7 10 20

Let’s say we need to round number to 3 decimal places, therefore use the following format −DecimalFormat decFormat = new DecimalFormat("0.000");Now, format the number −decFormat.format(37878.8989)Since we have used the DecimalFloat class above, therefore do import the following package −import java.text.DecimalFormat;The following is an example that rounds a number to 3 decimal places −Example Live Demoimport java.text.DecimalFormat; public class Demo {    public static void main(String[] args) {       DecimalFormat decFormat = new DecimalFormat("0.000"); System.out.println("Result = " + decFormat.format(37878.8989)); } }OutputResult = 37878.899Let us see another example that rounds a number ... Read More

DecimalFormat is a concrete subclass of NumberFormat that formats decimal numbers. Let us set DecimalFormat("###E0") and use the format() method as well.DecimalFormat decFormat = new DecimalFormat("##E0"); System.out.println(decFormat.format(-267.9965)); System.out.println(decFormat.format(8.19)); System.out.println(decFormat.format(9897.88));Since we have used DecimalFormat class in Java, therefore importing the following package is a must −import java.text.DecimalFormat;The following is the complete example −Example Live Demoimport java.text.DecimalFormat; public class Demo { public static void main(String[] argv) throws Exception { DecimalFormat decFormat = new DecimalFormat("###E0"); System.out.println(decFormat.format(-267.9965)); System.out.println(decFormat.format(8.19)); ... Read More

DecimalFormat is a concrete subclass of NumberFormat that formats decimal numbers. Let us set DecimalFormat("##E0") and use the format() method as well.DecimalFormat decFormat = new DecimalFormat("##E0"); System.out.println(decFormat.format(-189.8787)); System.out.println(decFormat.format(8.19)); System.out.println(decFormat.format(9897.88));Since, we have used DecimalFormat class in Java, therefore importing the following package is a must −import java.text.DecimalFormat;The following is the complete example −Example Live Demoimport java.text.DecimalFormat; public class Demo { public static void main(String[] argv) throws Exception { DecimalFormat decFormat = new DecimalFormat("##E0"); System.out.println(decFormat.format(-189.8787)); System.out.println(decFormat.format(8.19)); ... Read More

DecimalFormat is a concrete subclass of NumberFormat that formats decimal numbers. Let us set DecimalFormat("00.00E0") and use the format() method as well.DecimalFormat decFormat = new DecimalFormat("00.00E0"); System.out.println(decFormat.format(-289.8787)); System.out.println(decFormat.format(8.19));Since, we have used DecimalFormat class in Java, therefore importing the following package is a must −import java.text.DecimalFormat;The following is the complete example −Example Live Demoimport java.text.DecimalFormat; public class Demo { public static void main(String[] argv) throws Exception { DecimalFormat decFormat = new DecimalFormat("00.00E0"); System.out.println(decFormat.format(-289.8787)); System.out.println(decFormat.format(8.19)); System.out.println(decFormat.format(9897.88)); ... Read More

To display a currency in Java, use the following DecimalFormat −DecimalFormat decFormat = new DecimalFormat("\u00a4#, ##0.00");Since, we have used the DecimalFormat class, therefore do not forget to import the following package −import java.text.DecimalFormat;Now, let us learn how to display percentage −decFormat.format(877.80) decFormat.format(8.19) decFormat.format(9897.88)The above will be displayed as −$877.80 $8.19 $9, 897.88The following is the complete example −Example Live Demoimport java.text.DecimalFormat; public class Demo { public static void main(String[] argv) throws Exception { // for currency DecimalFormat decFormat = new DecimalFormat("\u00a4#, ##0.00"); ... Read More

To display a percentage in Java, use the following DecimalFormat.DecimalFormat decFormat = new DecimalFormat("#%");Since, we have used the DecimalFormat class, therefore do not forget to import the following package −import java.text.DecimalFormat;Now, let us learn how to display percentage −decFormat.format(0.80) decFormat.format(-0.19) decFormat.format(1.88)The above will be displayed as −80% -19% 188%The following is the complete example −Example Live Demoimport java.text.DecimalFormat; public class Demo { public static void main(String[] argv) throws Exception { DecimalFormat decFormat = new DecimalFormat("#%"); System.out.println(decFormat.format(0.80)); System.out.println(decFormat.format(-0.19)); ... Read More

To display numbers with leading zeros in Java, useDecimalFormat("000000000000").Let us first set the format with DecimalFormat class −DecimalFormat decFormat = new DecimalFormat("000000000000");Now, let us display some numbers with leading zeros −String res = decFormat.format(298989); System.out.println(res); res = decFormat.format(565); System.out.println(res);The following is an example −Example Live Demoimport java.text.DecimalFormat; public class Demo { public static void main(String args[]) { DecimalFormat decFormat = new DecimalFormat("000000000000"); String res = decFormat.format(298989); System.out.println(res); res = decFormat.format(565); ... Read More