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JDK Version Bytecode Version
Java 1.0 45.0
Java 1.1 45.3
Java 1.2 46.0
Java 1.3 47.0
Java 1.4 48.0
Java 5 49.0
Java 6 50.0
Java 7 51.0
Java 8 52.0
Java 9 53.0
Java 10 54.0
Java 11 55.0
Java 12 56.0
Java 13 57.0
Java 14 58.0
Java 15 59.0
Java 16 60.0
Java 17 61.0
Java 18 62.0
Java 19 63.0
Java 20 64.0
Java 21 65.0