Section 1 Begin with bug-proof code: it is mathematically impossible to find all bugs! prevent Java bugs from hatching; setting Java bugtraps; never miss another deadline! write to shun bugs. Section 2 Removing Java bugs: classes of bugs; mental disciplines; working around Java bugs; algorithms especially suited for Java; using debuggers; debugging stratagems; common Java bugs; testing; the threaded environment. Section 3 Performance: the one that got away; converting Java bugs to features; use the best algorithm - revisited ; ancient multi-threaded algorithms - revisited; profilers and other tools. Appendices: software; further information; Java syntax.