JAVA:

Suppose we define an IntArrayStack class that implements the interface Stack. (See exercise 307.) Our class has instance variables

private Integer [] theArray; // To hold the values in the stack private int topIndex; // For an empty stack, topIndex = -1 public final int maxSize; // the size of theArray after it gets allocated

Implement the push method . (You should be able to figure out what the method header looks like.)

In the case of a full stack, throw RuntimeException with the message "Stack is full."

Otherwise increment topIndex and assign the method 's parameter to theArray at the new topIndex.