Ruang untuk merangkai pengetahuan, satu baris kode setiap hari.
Temukan tutorial, ide, dan catatan dari perjalanan belajar.
Pelajari alur filter, map, dan collect untuk mengolah data Java dengan kode yang mudah dibaca.
Here is another example on how to read data from a ResultSet returned by executing an SQL query in a database. We start by creating a connection to the database. Creates a PreparedStatement to execute a query to get some data from the books table. After executing the PreparedStatement we will have a ResultSet object. […]
package org.kodejava.util; import java.util.Arrays; import java.util.Collections; public class ArrayMinMax { public static void main(String[] args) { // Creates an array of integer numbers in it. Integer[] numbers = {8, 2, 6, 7, 0, 1, 4, 9, 5, 3}; // To get the minimum or maximum value from the array we can // use the Collections.min() […]
Prior to Java 1.6 the java.io.File class doesn’t include a method to change a read only file attribute and make it writable. To do this on the old days we have to utilize or called operating system specific command. In Java 1.6 a new method named setWritable() was introduced to do exactly what the method […]
This code demonstrate how we can modify file attribute to be read only. File class has a setReadOnly() method to make file read only and a canWrite() method to know whether it is writable or not. package org.kodejava.io; import java.io.File; public class FileReadOnlyExample { public static void main(String[] args) throws Exception { File file = […]
If you want to know the free memory, and the total memory available in the Java runtime environment then you can use the following code snippet to check. package org.kodejava.lang; public class MemoryExample { public static void main(String[] args) { long freeMemory = Runtime.getRuntime().freeMemory(); long totalMemory = Runtime.getRuntime().totalMemory(); System.out.println("Free Memory = " + freeMemory); System.out.println("Total […]
Since Java 1.5 (Tiger) the java.net.InetAddress class introduces isReachable() method that can be used to ping or check if the address specified by the InetAddress is reachable. package org.kodejava.net; import java.net.InetAddress; public class PingExample { public static void main(String[] args) { try { InetAddress address = InetAddress.getByName("172.16.2.0"); // Try to reach the specified address within […]
Simpan rasa ingin tahu. Selalu ada hal baru untuk dipelajari.
Penulis dan pendiri Diary Coding — berbagi catatan, tutorial, dan pengalaman seputar pemrograman untuk siapa pun yang ingin terus belajar.