Groovy入门

典型语法

new

$x

in

as

is()

Syntax

Comments

//
/*
	*/
/**
 * Class description
 */
#!/usr/bin/env groovy

Keywords

as	assert	break	case
catch	class	const	continue
def	default	do	else
enum	extends	false	finally
for	goto	if	implements
import	in	instanceof	interface
new	null	package	return
super	switch	this	throw
throws	trait	true	try
while

Identifiers

Strings

Groovy中有java.lang.String和groovy.lang.GString（字符串插值）。

'Hello'
"Hello World"
'''
line 1
line 2
'''
"""
line 1
line 2
"""

def name = 'Ming'
def greeting = "Hello ${name}"

Numbers

• byte
• char
• short
• int
• long
• java.lang.BigInteger
• float
• double
• java.lang.BigDecimal

Booleans

Lists

def squares = [1, 4, 9]
def list = [1, "a", true]
LinkedList list1 = [1, 2, 3]
def multi = [[0, 1], [2, 3]]

Arrays

String[] arrStr = ['Ananas', 'Banana', 'Kiwi']

Maps

def colors = [red: '#FF0000', green: '#00FF00', blue: '0000FF']
colors[red]
colors.green

Operators

Program Structure

Object orientation

Types

class Person {
    
    String name
    Integer age
    
    def increaseAge(Integer years) {
        this.age += years
    }
}

def p = new Person()

extends
abstract
interface
implements

Groovy支持命名参数、默认参数。

Closure

Semantics

待

2020-3-8 21:52:42