What r the good examples of transient kinda variable?

Can anyone plz tell me few good examples of transient variables?

Anything that can be calculated from other members of the object, e.g.
class Grades {
double exam1;
double exam2;
double exam3;
transient double average;
public Grades(double exam1, double exam2, double exam3) {
this.exam1= exam1;
this.exam2= exam2;
this.exam3= exam3;
this.average = (exam1+exam2+exam3)/3;
}

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What r the good examples of transient kinda variable?

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