Creating field with name which is already used in the current scope (variable or parameter in current method) produces not compilable code. But adding "this." would solve the problem

Example:
1) have a code:
    public void test() {
        final String temp = "";
        int c = 1;
        
    }

2) select "1" and call introduce field
3) type "temp" as a name of the new field and confirm

-> IDE generates:
   private int temp;

   public void test() {
        final String temp = "";
        temp = 1;   // <- incompatible types
        int c = temp; //<- incompatible types
        
    }

but the IDE can generate following code which is ok

   private int temp;

   public void test() {
        final String temp = "";
        this.temp = 1;   
        int c = this.temp; 
        
    }


Product Version: NetBeans IDE Dev (Build 20130606-5a346fc7541c)
Java: 1.8.0-ea; Java HotSpot(TM) 64-Bit Server VM 25.0-b31
Runtime: Java(TM) SE Runtime Environment 1.8.0-ea-b89
System: Windows 7 version 6.1 running on amd64; Cp1250; en_US (nb)
User directory: C:\Users\jprox\AppData\Roaming\NetBeans\dev
Cache directory: C:\Users\jprox\AppData\Local\NetBeans\Cache\dev