Programmer Xu Shu
Feb 21, 2025 · Backend Development
Why Calling start() Twice on a Java Thread Throws IllegalThreadStateException
This article explains the purpose of Java's Thread.start() method, demonstrates what happens when it is invoked twice, shows the resulting IllegalThreadStateException, and provides a detailed analysis of the start() source code to clarify the thread lifecycle.
Backend DevelopmentIllegalThreadStateExceptionJava
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