Coding in Java can be painstaking at times, especially when you don’t know of any simpler path to walk down. There are classes, objects, interfaces, strings and an array of other elements which you need to be mindful about. This is why people hire Java developers to take care of application programming.

If you are a Java developer like me, then writing your code in a manner which yields best performance is your sole aim. Here are some quick coding tactics which can help you with improvising the performance of you upcoming Java app. Take a look.

  • Prefer Interfaces over Abstract Classes: Implementing multiple classes in Java is definitely gruesome but implementing multiple interfaces isn’t. So interfaces always have an upper hand over abstract classes. It is simpler to change the implementation of a class and add an interface implementation in its place rather than reworking on the entire hierarchical class structure. Again, start writing an interface only when you are too sure about the elements which will be inherited in the interface, because once you have implemented an interface, adding a new method to it without breaking the code is impossible.
  • Don’t Create Unnecessary Objects: Object creation is one practice in Java which utilizes maximum memory and impacts the performance of the application. Thus, it is advisable to create or initialize a class only in case of dire need.Here’s an example:
public class Nations {
private List Nations;
public List getNations() {
//initialize when necessary
if(null == nations) {
nations = new ArrayList();
}
return nations;
}
}
  • Keep the Mutability of a Class Minimum: Mutability of a class refers to its ability of being modified, and as implies, making a class immutable means rendering it unmodified.  Immutable classes are simple to create and easy to manage. They are thread-safe and provide a good platform for building other Java objects. In order to make an immutable class, you can simply define all its constructors as private, then initialize the object using a public method and finally return it.
public class Student {
private String Name;
private String RollNo;
//declare default constructor as private
private Student(String Name, String RollNo) {
this.Name = Name;
this.RollNo = RollNo;
}
public static Student valueOf (String Name, String RollNo) {
return new Student(Name, RollNo);
}
}
  • Keep the Scope of Local Variable Limited: Using local variables isn’t any sin, but at times while copy pasting the code we tend to make some errors or insert some bugs. It helps to keep the scope of local variables limited, because the code becomes readable, the numbers of bugs are considerably reduced and maintenance of the code becomes an easy job. Thus, it is best to declare a variable only when it’s needed or right before its use in the application. If this is not possible, assign null value to the local instance.
  • Be Cautious While Using Strings: Strings are the trickiest part in Java development, and thus you need to be careful about their usage. A simple string concatenation can impact the performance of your program. It will not consume a lot of memory but will also impact the performance time adversely. Also, be cautious as you initiate a string. Instead of using constructor, initiate it directly. For instance:
public String getStudentName() {
return (null==studentName ? "": studentName);
}

To err is human, but if you be mindful about the aforementioned tips, you can easily optimize your Java code for ultimate performance and minimize any chances of committing errors!