Unplug the refrigerator. Mark the wires so you know where they go into the switch. Take out the switch and tube. Go to an appliance parts store with the switch and tube and the model and serial number of the refrigerator and get a new part. Do not kink, bend, or fold the new tube as you carry it home or install it.
A string variable is an array of characters. char a[10]; Which can hold any string value , that has a lenght less than or equal to the size of the character array. Whereas a string constant , is a particular string .
Reference variables are not pointers but a handle to the object which is created in heap memory. The main difference between primitive and reference type is that primitive type always has a value, it can never be null but reference type can be null, which denotes the absence of value.