groovy入門

直接見代碼.groovy有啥優點就不說了.直接google大神去吧~

?

package test

/**
?* @author Yansheng
?*
?*/
public class HelloWorld{
?
?/**
? * 赋值,调用域
? */
?def x;
?def y;
?private float z;

?public static void main(String... args) {
??def hello = new HelloWorld(x:3,y:'yansheng',z:3.4);?// 初始化对象,赋值域
??println '------------? invoke domain(调用域) ---------------';
??println 'invoke x: ' + hello.x;?// 调用x域
??println 'invoke y: ' + hello.y;?// 调用y域
??println 'invoke z: ' + hello.z;?// 调用z域
??hello.method('invoke Method');?// 调用方法
??hello.operator(); // 打印操作运算
??hello.testString(); // 测试字符串
??hello.invokeMapping(); // 调用列表,映射 范围
??hello.formatPrint();?// 输出
??hello.flowControl();
??hello.closure();
?}

?/**
? * 调用方法
? */
?public void method(message,msg=3) {
??println message;
?}
?
?/**
? * 操作运算
? */
?public void operator() {
??println '------------? print operator(打印操作符) ---------------';
??print '加法: ';??? print 5 + 3 + '/t';??? println 5.plus(3);
??print '减法: ';??? print 5 - 3 + '/t';??? println 5.minus(3);
??print '乘法: ';??? print 5 * 3 + '/t';??? println 5.multiply(3);
??print '除法: ';??? print 5 / 3 + '/t';??? print 5.div(3) + '/t';??? println 5.intdiv(3)
??print '模法: ';??? print 5 % 3 + ' ';??? println 5.mod(3);
?}
?
?/**
? * 测试字符串
? */
?public void testString() {
??def greeting = 'Hello Wrold';
??
??println '------------? test String(测试字符串) ---------------';
??def age = 25;
??println 'my age is ${age}';
??println "my age is ${age}";
??println """my age is ${age}""";
??println "my age is /${age}";

??println '------------? test String Index(测试字符串定位) ---------------';??println greeting[4];??println(greeting[-1]);??println(greeting[1..2]);??println(greeting[1..<3]);??println(greeting[4..2]);??println(greeting[4,1,6]);????println '------------? test String Operater(测试字符串操作) ---------------';??println 'Hello' * 3;??println greeting - 'o Wrold';??println greeting.size();??println greeting.length();??println greeting.count('o');??println greeting.contains('ell');?}??public void invokeMapping() {??println '------------? invoke List(调用数组) ---------------';??def numbers = [11,12,13,14];??println numbers[0];??println numbers[-1];??println numbers.getAt(0..2);??println numbers + [15,16];????println '------------? invoke Map(调用映射) ---------------';??def map = ['Ken':'Barclay','John':'Savage'];??println map['Ken'];??map.put('Bob',2713);??println map.get('Bob',444);??println map.keySet();??println map.size();????println '------------? invoke rang(调用范围) ---------------';??def between = 1990..1999;??println between;??println between.size();??println between.get(0);?}??public void formatPrint() {??println '------------? format print(格式化输入输出) ---------------';??printf('My name s ken /n',[]);??def a = 10;??def b = 15;??printf('the sum of %d and %d is %d /n',[a,b,a + b]);??print "please enter your name: ";??//def name = System.in.readLine()?// 会报错????def name = new BufferedReader( new InputStreamReader(System.in) ).readLine()??println "my name is ${name}";?}??public void flowControl() {??println '------------? flow control(流程控制) ---------------';??def LIMIT = 10;??for (count in 1..LIMIT){???println "count: ${count}";??}??for (count in [11,14]){???println "count: ${count}";??}????/*??var score;??switch(score) {???case 70..100:????break;???case 'one':????break;???case [21,22,23,24]:????break;??}??*/?}??public void closure() {??println '------------? closure(闭包) ---------------';??println '闭包语法{comma-separated-formal-parameter-list -> statement-list}';??def clos = {println 'This is closure'};??clos.call();??clos = {param -> println "This is ${param}"};??clos.call('closure');??clos('closure');??clos = {println "This is ${it}"};?// it是隐函数.只能是it??clos.call('closure');?}}