【Salesforce】Ending position out of bounds: 3

【Salesforce】Ending position out of bounds: 3

例：

String areaCodeA = phone.substring(0,3); 

エラー：

Ending position out of bounds: 3

対策：

if(phone.Length()>=3){

    String areaCodeA = phone.substring(0,3); 

}

参考URL

https://developer.salesforce.com/forums/?id=906F0000000kAICIA2