Fixing errors in Android Java applications

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This document discusses several Java programming topics including raw type parameters, working with the Java compiler, logging, and static analysis. It describes common Java problems like raw types and demonstrates how to address them. It also shows how to configure Java compiler preferences for tighter type checking and how logging and static analysis can help find bugs.

Technology Education

Java problems Raw type parameters Working with the Java compiler Logging Static analysis

CS/SE Individual Practical

Stephen Gilmore
November 11, 2011
School of Informatics, University of Edinburgh

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Java problems

Common Java problems: raw types

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Java problems

Quick ﬁx: a bad suggestion

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Java problems

Check the constructor documentation

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Java problems

Check the class documentation

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Java problems

What type of array are we adapting?

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Java problems

Type parameter added

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

Raw type in method header

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

Consult the Java documentation

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

Adapter doesn’t work here

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

Adapter is an interface

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

T is not a class

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

Object: the goto class

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

T extends Adapter doesn’t work

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

“?” — the wild card parameter

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

“Quick ﬁx” would have worked here

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

Same result

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Working with the Java compiler

Setting Java compiler preferences

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Working with the Java compiler

Changing defaults

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Working with the Java compiler

Potential programming problems

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Working with the Java compiler

Tighter checking

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Working with the Java compiler

Bug found

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Logging

Don’t forget to add logging . . .

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Static analysis

Deeper analysis (resource leaks . . . )

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