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, 12, 13, 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');
}
}