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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 […]
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