Author: Java2blog

In this post, we will see how to rename a file in java. We can use java.io.File ‘s rename(File dest) method to rename a file. rename method returns true if operation is success else returns false. It can use this method to move a file also. You should always check if rename operation is successful […]

If you want to practice data structure and algorithm programs, you can go through data structure and algorithm interview questions. In this post, we will see how to find start node of loop in linkedlist in java. We have already seen how to detect a loop in linkedlist in java. This is extension of that post. […]

In this post, we will see how to make a read only file in java. It is very simple. You need to just call java.io.File ‘s  setReadOnly() method. 1) How to make a file read only Java program: package org.arpit.java2blog; import java.io.File; public class FileHiddenMain { public static void main(String[] args) { System.out.println("-----------------"); // Read […]

In this post, we will see how to import all classes at once in eclipse. Problem : Sometimes you copy any java code from somewhere and you see many import errors. You go to each class and press ctrl + space to import each class one by one. Lets say you have large number of classes, […]

In this post, we will see how to read a file from resources folder in java. If you create a maven project(simple java or dynamic web project) , you will see folder src/java/resources. You can read from resources folder using these simple code. // Getting ClassLoader obj ClassLoader classLoader = this.getClass().getClassLoader(); // Getting resource(File) from […]

In this post , we will see how to read properties file in java. Properties files are used in java projects to externalise configuration, for example, database settings. Java uses Properties class to store the above key-values pair. Properties.load() method is very convenient to load properties file in form of key-values pairs. Properties file looks […]

In this post, we will see how to read object from file in java. In last post, we have already seen how to write object to a file and created employee.ser , now in this post, we are going to read same file and retrieve back Employee object. Java Serialization Tutorial: Serialization in javaJava Serialization […]

If you want to send object over network, then you need to  write object to a file and convert it to the stream. This process can be referred as serialization. Object needs to implement Serializable interface which is marker interface  interface and we will use java.io.ObjectOutputStream to write object to a file. Java Serialization Tutorial: […]

In this post, we will see how to get last modified date of file in java. We can use java.io.File’s lastModified() method to get last modified date. This function returns time in milliseconds(long). We can convert this to required date format using SimpleDateFormat. Java Program: package org.arpit.java2blog; import java.io.File; import java.text.SimpleDateFormat; public class GetLastModifiedTimeOfFileMain { public […]