Flutter and Java are both used for developing cross-platform operations. Flutter is across-platform Mobile frame from Google. Flutter help inventor and developer to make ultramodern mobile operation for Android and iOS. 

Java is one of the extensively used object- oriented and class- grounded programming languages for mobile, web and desktop operations. Flutter Designing, the mobile app is a veritably gruelling task. There are several fabrics available to design the mobile app. A rich set of features are handed by these fabrics. 

The native frame handed by Android is grounded on Java and Kotlin language. The frame handed by iOS is grounded on the ideal- C/ Swift language. Now, it’s clear that we bear two different languages with fabrics to develop a mobile app for both operating systems.

To overcome this problem, we’ve several cross-platform development tools or fabrics that are suitable to develop a mobile app for both operating systems. By using these fabrics, we can write law formerly and can emplace it on colourful platforms like Android, iOS, and Desktop. Ionic, PhoneGap, Xamarin, and Reply Native are some of the fabrics of the cross-platform development family. Flutter is a new ross-platform frame developed by Google. 

In order to produce a beautiful and fast operation for web, desktop and mobile using a single language and codebase, the use of flutter is growing day by day. It’s a free and open- source frame or tool which is presently maintained by ECMA standard. Dart programming language is used by the flutter for developing operations. Dart programming has the same features as Kotlin and Swift and can be trans- collected into JavaScript law.

 Pros 

1. Hot Reload. It means whenever a inventor makes changes in the law, the changes incontinently visible in the app itself.

 2. Cross-platform. It means it allows us to write law formerly and emplace on colorful platforms or Operating System.

3. Performance is its third advantage. Its end is to give 60 frames per alternate performance on bias. 

4. Backed by Google. 

5. Flutter canons are collected into native law. 

6. It’s an open- source frame. We do not need to buy it. It’s freely available in the request.

7. Flutter allows rapid-fire prototyping.

8. It provides flexible and suggestive UI. 

9. Singleton codebase. 

10. It provides fast development. 

11. It provides material design. 

Cons

 In order to use flutter, we need to learn the outrage programming language. 

1. It does not support a 3D plates machine.

2. Lack of community support. 

3. Lack of creation. 

4. Lack of friendly attestation. 

5. Graphics programming. 

Java is one of the extensively used, class- grounded, and object- acquainted programming language developed by Sun Microsystems in 1995. It provides a rich set of libraries that are used to developed mobile, web and desktop operations. Java is veritably easy to learn and understand. It’s a platform-independent language and secures using a virtual machine. Java programming language is suitable to develop not only the Desktop operation but also Mobile and Web operations too. provides a set of libraries to develop web, mobile and desktop operations. 

Pros 

1. It’s a extensively- used programming language. 

2. It provides excellent tooling. 

3. It has a set of attestation

4. A large set of inventors are available.

5. It has excellent performance. 

6. Used to develop Web, Mobile and Desktop operations.

7. It’s veritably easy to learn and understand. 

8. Excellent SDK and JDK.

 9. It’s an open- source verbalism is the first disadvantage of Java. It means we need to write further law in further words than demanded.

 1. It has Nullpointer Exception. 

2. It has a boilerplate law. 

3. Read- eval- print- circle isn’t present. 

4. Graphics programming. 

5. It’s a strict type of programming language. 

6. It returns wildcard type. – point crimes. 

8. No parcels are available. 

9. No voluntary parameters are available 

Permutation of figures in Java:

In this section, we will develop a Java program and find the permutation and cyclic permutation of a number. Before moving ahead in this section, first, we will understand permutation with exemplifications. 

Permutation – In mathematics, the permutation is a system or fashion in which we can determine the possible arrangements in a set. The number of ways of selection and arrangement of particulars in which orders matters. In short, the permutation is the number of arrangements. 

It’s denoted by the letter P. In other words, it’s a fashion by which we can arrange ( or elect) r objects out of given n objects in a particular order.