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Java Articles
Page 96 of 450
Format integer values with java.text.DecimalFormat
Here, we are using the DecimalFormat class in Java to format integer value, which is the java.text.DecimalFormat package.Let us take the following format: DecimalFormat("0.######E0") and use the format() method for this purpose −new DecimalFormat("0.#####E0").format(5089) new DecimalFormat("0.#####E0").format(608)Since, we have used DecimalFormat class in Java, therefore importing the following package in a must −import java.text.DecimalFormat;The following is an example −Exampleimport java.text.DecimalFormat; public class Demo { public static void main(String[] argv) throws Exception { System.out.println(new DecimalFormat("0.#####E0").format(387979)); System.out.println(new DecimalFormat("0.#####E0").format(29797)); System.out.println(new DecimalFormat("0.#####E0").format(49788)); ...
Read MoreDisplay numbers with leading zeroes in Java
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 −Exampleimport 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 MoreDisplay a percentage in Java
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 −Exampleimport 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 MoreDisplay a currency value in Java
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 −Exampleimport java.text.DecimalFormat; public class Demo { public static void main(String[] argv) throws Exception { // for currency DecimalFormat decFormat = new DecimalFormat("\u00a4#, ##0.00"); ...
Read MoreDecimalFormat("###E0") in Java
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 −Exampleimport 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)); System.out.println(decFormat.format(9897.88)); ...
Read MoreJava Program to copy an array from the specified source array
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 −Exampleimport 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
Read MoreJava Program to return the hexadecimal value of the supplied byte array
The following is the supplied byte array −byte[] b = new byte[]{'x', 'y', 'z'};We have created a custom method “display” here and passed the byte array value. The same method converts byte array to hex string −public static String display(byte[] b1){ StringBuilder strBuilder = new StringBuilder(); for(byte val : b1){ strBuilder.append(String.format("%02x", val&0xff)); } return strBuilder.toString(); }Let us see the entire example now −Examplepublic class Demo { public static void main(String args[]) { byte[] b = new byte[]{'x', 'y', 'z'}; ...
Read MoreApply modulus operator to floating-point values in Java
To apply modulus (%) operator to floating-point values in an effortless task. Let us see how.We have the following two values −double one = 9.7; double two = 1.2;Let us now apply the modulus operator −one % twoThe following is the complete example that displays the output as well −Examplepublic class Demo { public static void main(String args[]) { double one = 9.7; double two = 1.2; System.out.println( one % two ); } }Output0.09999999999999964
Read MoreJava program to print the initials of a name with last name in full
When the full name is provided, the initials of the name are printed with the last name is printed in full. An example of this is given as follows −Full name = Amy Thomas Initials with surname is = A. ThomasA program that demonstrates this is given as follows −Exampleimport java.util.*; public class Example { public static void main(String[] args) { String name = "John Matthew Adams"; System.out.println("The full name is: " + name); System.out.print("Initials with surname is: "); int len = name.length(); name ...
Read MoreHow to display Java Runtime Environment (JRE) version
Use the System.getProperty() method in Java to get the Java Runtime Environment.It’s syntax is −String getProperty(String key)Above, the key is the name of the system property. Since, we want the Java Runtime Environment name, therefore we will add the key as −java.versionThe following is an example −Examplepublic class Demo { public static void main(String[] args) { System.out.print("Java Specification Version: "); System.out.println(System.getProperty("java.specification.version")); System.out.print("java Runtime Environment (JRE) version: "); System.out.println(System.getProperty("java.version")); } }OutputJava Specification Version: 1.8 java Runtime Environment (JRE) version: 1.8.0_141
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