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'); }}
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