by Robert Dyer, Hridesh Rajan, Hoan Anh Nguyen, and Tien N. Nguyen

Table of Contents

• Introduction
• Section 2 - JLS Background
• Section 4.2 - Dataset Metrics
• Section 5.1 - RQ1 - Do projects use new language features before the features are released?
• Section 5.2 - RQ2 - How frequently is each language feature used?
  • Section 5.2.1 - Investigating Frequently Used Features
• Section 5.3 - RQ3 - How did committers adopt and use language features?
  • Section 5.3.1 - RQ3.1 - How many committers adopted and used new features over time?
  • Section 5.3.2 - RQ3.2 - How much did committers use each feature?
  • Section 5.3.3 - RQ3.3 - Did committers adopt features on an individual basis or as a team?
  • Section 5.3.4 - RQ3.4 - Did committers use all new features?
• Section 5.4 - RQ4 - Were there missed opportunities to use language features?
• Section 5.5 - RQ5 - Was old code converted to use new language features?

Section 5.2 - RQ2 - How frequently is each language feature used?

Boa Program: uses.boa
Raw Data: uses.txt
Figure 4 Generator: uses.java

This material mines uses for language features, shown in Figure 4.

Boa Program: first-uses.boa
Raw Data: first-uses.txt
Chart Generator: Histogram.java

This material mines uses for language features over time, which is used to generate the histograms shown in Figures 5-6.

NOTE: The Boa Program and Raw Data are the same as Section 5.1.

Boa Program: times.boa
Raw Data: times.txt
Chart Generator: Densities.java

This material mines when files and projects were created, which (along with the previous data) is used to generate the density plots shown in Figures 5-6.

Section 5.2.1 - Investigating Frequently Used Features

Boa Program: top-annotations.boa
Raw Data: top-annotations.txt
Figure 7 Generator: topannotations.java

This material mines the most frequently used annotations, shown in Figure 7.

Boa Program: top-generic-types.boa
Raw Data: top-generic-types.txt
Figure 8 Generator: topgenerictypes.java

This material mines the most frequently used generic types, shown in Figure 8.

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