Side Effect of toString() Method Invocation

[llmhyy]

In the process of debugging, the string value of an object variable will be recorded by dynamically invoking its toString() method. However, a side-effect of such an operation is to modify the program state if the toString() writes some fields of the object variable.

A possible solution is to remember the program state before toString() method invocation and restore the state after the invocation is finished.