Groovy
Apache Groovy is a powerful, optionally typed and dynamic language, with static-typing and static compilation capabilities, for the Java platform aimed at improving developer productivity thanks to a concise, familiar and easy to learn syntax
Install
1 cd ~/
2 wget https://groovy.jfrog.io/artifactory/dist-release-local/groovy-zips/apache-groovy-binary-4.0.26.zip
3 unzip apache-groovy-binary-4.0.26.zip
4
5 nano ~/.bashrc
6 # export GROOVY_HOME=$HOME/groovy-4.0.26
7 # export PATH=$PATH:$GROOVY_HOME/bin
8 . ~/.bashrc
9 groovysh
10 # a = 1
11 # print("aaa $a")
12 # :q
13 groovyConsole # opens window that allows to run groovy code
14
groovyc - compiler
nano MyClass.groovy
swing - groovy
1 import groovy.swing.SwingBuilder
2 import java.awt.BorderLayout as BL
3
4 count = 0
5
6 def actionPerformedFn(){
7 count++;
8 textlabel.text = "Clicked ${count} time(s)."
9 println "clicked"
10 }
11
12 def quitFn(){
13 System.exit(0)
14 }
15
16 new SwingBuilder().edt {
17 frame(title: 'Frame', size: [300, 300], show: true) {
18 borderLayout()
19 textlabel = label(text: 'Click the button!', constraints: BL.NORTH)
20 button(text:'Click Me', actionPerformed: {actionPerformedFn()}, constraints:BL.WEST)
21 button(text:'Quit', actionPerformed: {quitFn()}, constraints:BL.EAST)
22 }
23 }
Map example - map.groovy
1 /*
2 run: groovy map.groovy
3 compile and run with java
4 groovyc map.groovy
5 java -cp .:$GROOVY_HOME/lib/groovy-4.0.26.jar map
6 */
7 def map=[:]
8 map.x = 1
9 map["y"] = "ab"
10 print("Serialized map $map \n")
11
12 print("Keys size: ${map.keySet().size()} \n")
13 for(key in map.keySet()){
14 print "$key: ${map["$key"]}\n"
15 }