Groovy基础语法

基础语法

// GDK数值方法
def store = ''
10.times {store += 'x'}
assert store == 'xxxxxxxxxx'
  
store = ''
1.upto 5, {number -> store += number}
assert store == '12345'

store = ''
2.downto(-2) {number -> store += number + ' '}
assert store == '2 1 0 -1 -2 '
  
store = ''
0.step 0.5, 0.1, {number -> store += number + ' '}
assert store == '0 0.1 0.2 0.3 0.4 '
  
// 运算符，运算符实际上是一个方法
// a==b 等价 a.equals(b)
// Groovy的 === 就是 Java的 ==
assert 4>3        //4.compareTo(3) > 0
assert 4<=>3 ==1  //4.compareTo(3)

// 字符串
def name = 'xace'
print "\thello ${name}"
// 原格式输出
println '''
aaaa
bbbb
'''

// 方法 可以省略return，默认参数
def static welcome(defaultStr='hello',name){
  println "${defaultStr} ${name}"
}
welcome('xace')
welcome('fxxk', 'xace')

// 语句特性
for(var in [0,1,10,11,0.5f]) {
  switch(var){
    case 0: print '1'
    case 11..20: print '2'
    case '10': print '3'
    case [1,2,3]: print '4'
    case Float: print '5'
    case {it % 3 == 0}: print '6'
    case ~'[0-9]{3}': print '7'
    default: println ''
  }
}

// 一个小游戏，根据提示输入，返回输入结果
package demo
def printMenu(){
  println ''
  println 'Welcom to Toy Manager View'
  println '=========================='
  println '''
    0.Exit System
    1.Add Toy
    2.Display All Toy
    3.Update Toy
    4.Delete Toy
    5.Display Toy
    6.Delete All Toy
  
      Please Choice
  '''
  new BufferedReader(new InputStreamReader(System.in)).readLine();
}

def choice=printMenu()
while(choice != 0){
  if(choice == '1') println 'add toy'
  else if (choice == '2') println 'display all toy'
  else if (choice == '3') println 'update toy'
  else if (choice == '4') println 'delete toy'
  else if (choice == '5') println 'display toy'
  else if (choice == '6') println 'delete all toy'
  choice = printMenu()
}