<ul><li>The most modern and concise way to convert a List to a Map in Java is with the Stream API and Collectors.toMap().</li><li>Handle key collisions with a merge function if the key extractor may produce duplicates to avoid IllegalStateException.</li><li>For those not comfortable with stream syntax or using Java 7 or earlier, a simple loop can also be used for conversion.</li><li>Choose the appropriate approach based on your use case and coding style, whether it be using the Stream API or traditional methods.</li></ul>

Converting a List to a Map in Java: Multiple Approaches

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