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@Override public boolean equals (Object o) { if (o this) // A return true; if (!(o instanceof List)) // B return false; ListIterator e1 = listIterator(); ListIterator e2 = ((List) o).listIterator(); while (e1.hasNext() && e2.hasNext()) // C { E 01 e1.next(); Object 02 = e2.next(); if (!(01 = null ? 02 == null: 01.equals (02))) // D retum false; } return (e1.hasNext() || e2.hasNext()); // E }

@Override public boolean equals (Object o) { if (o this) // A return true; if (!(o instanceof List)) // B return false; ListIterator e1 = listIterator(); ListIterator e2 = ((List) o).listIterator(); while (e1.hasNext() && e2.hasNext()) // C { E 01 e1.next(); Object 02 = e2.next(); if (!(01 = null ? 02 == null: 01.equals (02))) // D retum false; } return (e1.hasNext() || e2.hasNext()); // E }

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question

Consider the equals() method from the java.util.AbstractList class. 

(a) Draw a control flow graph for this method. Several possible
values can be used for the node number in the graph. Choose
something reasonable.
(b) Label edges and nodes in the graph with the corresponding code
fragments. You may abbreviate predicates as follows when
labeling your graph:
A: o == this
B: !(o instanceof List)
C: e1.hasNext() && e2.hasNext()
C: e1.hasNext() && e2.hasNext()
D: !(o1 == null ? o2 == null :
o1.equals(o2))
E: !(e1.hasNext() $\parallel$ e2.hasNext())
(c) Node coverage requires (at least) four tests on this graph.
Explain why.

@Override public boolean equals (Object o) { if (o this) // A return true; if (!(o instanceof List)) // B return false; ListIterator e1 = listIterator(); ListIterator e2 = ((List) o).listIterator(); while (e1.hasNext() && e2.hasNext()) // C { E 01 e1.next(); Object 02 = e2.next(); if (!(01 = null ? 02 == null: 01.equals (02))) // D retum false; } return (e1.hasNext() || e2.hasNext()); // E }
Transcribed Image Text:@Override public boolean equals (Object o) { if (o this) // A return true; if (!(o instanceof List)) // B return false; ListIterator e1 = listIterator(); ListIterator e2 = ((List) o).listIterator(); while (e1.hasNext() && e2.hasNext()) // C { E 01 e1.next(); Object 02 = e2.next(); if (!(01 = null ? 02 == null: 01.equals (02))) // D retum false; } return (e1.hasNext() || e2.hasNext()); // E }
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