Groovy: Convert string to int

In this post, I am going to show you different ways to convert string to an integer.

a.   Using toInteger method

b.   Using as operator

c.    Using Integer.valueOf method

d.   Using Integer.parseInt method

Groovy string provides ‘isInteger’ method, it returns true, if the string can be converted to integer, else false.

HelloWorld.groovy

String data1 = "123"
String data2 = "Hello123"

convertToInt(data1)
convertToInt(data2)

void convertToInt(String data){
 if(data.isInteger()){
  int result1 = data.toInteger()
  int result2 = data as Integer
  int result3 = Integer.parseInt(data)
  int result4 = Integer.valueOf(data)
  
  println "result1: $result1"
  println "result2: $result2"
  println "result3: $result3"
  println "result4: $result4"
  
 }else{
  println "$data can't be converted to integer"
 }
}

Output

result1: 123

result2: 123

result3: 123

result4: 123
Hello123 can't be converted to integer

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