JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How to create java project in gradle?


This page gives an introduction to gradle java project, include java plugin in your gradle configuration file, which adds all required tasks by default.

apply plugin: 'java'

Folder structure should be similar to maven java project folder structure.

src/main/java
src/test/java
src/main/resources
src/test/resources
build – all output files will be created here.
build/lib

Add below configuration to define external dependencies using maven.

repositories {
        mavenCentral()
}

dependencies {
        compile group: 'commons-collections', name: 'commons-collections', version: '3.2'
        testCompile group: 'junit', name: 'junit', version: '4.+'
}

The Java plugin by default adds many properties to your project. You are allowed to change these values. Here is an example to customize your MANIFEST.MF file:

sourceCompatibility = 1.5
version = '1.0'
jar {
        manifest {
                attributes 'Implementation-Title': 'Gradle Quickstart',
                          	        'Implementation-Version': version
        }
}

Here is the complete sample java project configuration using gradle:

apply plugin: 'java'
apply plugin: 'eclipse'
sourceCompatibility = 1.5
version = '1.0'
jar {
        manifest {
                attributes 'Implementation-Title': 'Gradle Quickstart',
                           'Implementation-Version': version
                }
}
repositories {
        mavenCentral()
}
dependencies {
        compile group: 'commons-collections', name: 'commons-collections', version: '3.2'
        testCompile group: 'junit', name: 'junit', version: '4.+'
}
test {
        systemProperties 'property': 'value'
}
uploadArchives {
        repositories {
                flatDir {
                        dirs 'repos'
                }
        }
}

Reference: Gradle Documentation

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Gradle configuration examples

  1. Gradle Installation Steps
  2. What is gradle project and task
  3. What is build.gradle file?
  4. How to avoid gradle log messages?
  5. How to define default tasks in Gradle?
  6. How to list all gradle tasks?
  7. How to list gradle project properties?
  8. How to declare a task that depends on other task?
  9. How to create dynamic tasks in Gradle?
  10. How to exclude a task in gradle?
  11. How to create java project in gradle?
Knowledge Centre
When to use LinkedList or ArrayList?
Accessing elements are faster with ArrayList, because it is index based. But accessing is difficult with LinkedList. It is slow access. This is to access any element, you need to navigate through the elements one by one. But insertion and deletion is much faster with LinkedList, because if you know the node, just change the pointers before or after nodes. Insertion and deletion is slow with ArrayList, this is because, during these operations ArrayList need to adjust the indexes according to deletion or insetion if you are performing on middle indexes. Means, an ArrayList having 10 elements, if you are inserting at index 5, then you need to shift the indexes above 5 to one more.
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The greatest obstacle to discovery is not ignorance; it is the illusion of knowledge.
-- Daniel J. Boorstin

About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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