7, logical branch
(1) IF-ELSE statement
l Groovy provides the same IF-ELSE statement in Java
x = false
Y = false
IF (! x) {
x = true
}
askX == True
IF (x) {
x = false
} else {
Y = true
}
askERT X == Y
l Groovy also supports three yuan operators
Y = 5
X = (Y> 1)? "worked": "failed"
askERT X == "worked"
(2) SWITCH statement
l Groovy's Switch statement is compatible with Java code, and the difference between Groovy's Switch statement can handle various types of Switch values. You can do various types of matching.
Ø Case value Match the Switch value for the class name as class instance
Ø Case value is a string of the regular expression matching the Switch value matching the regular expression
Ø Case value is a collection of Switch values included in the collection, including Ranges
Ø In addition to the above, the Case value matches the Switch value.
X = 1.23
Result = ""
Switch (x) {
Case "foo":
Result = "Found foo"
// Lets Fall Through
Case "bar":
Result = "bar"
Case [4, 5, 6, 'inList']:
Result = "List"
Break
Case 12..30:
Result = "Range"
Break
Case Integer:
Result = "integer"
Break
Case Number:
Result = "Number"
Break
DEFAULT:
Result = "default"
}
askERT RESULT == "Number"
l Switch statement works: Switch statement calls iscase (SwitchValue) method when doing matching case value, is default call (switchValue), but has been overloaded into various types, such as classes, regular expressions, collections, etc.
l You can create custom match classes, add iSCase (SwitchValue) to provide custom match types.
