2.1. Java Version Numbers
For reference, let’s take a quick look at the Java version numbers. This will come in handy in case we need to download the appropriate Java version.
The major and minor version numbers are stored in the class bytecode at bytes six and seven.
Let’s see how the major version numbers map to Java versions:
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45 = Java 1.1
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46 = Java 1.2
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47 = Java 1.3
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48 = Java 1.4
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49 = Java 5
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50 = Java 6
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51 = Java 7
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52 = Java 8
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53 = Java 9
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54 = Java 10
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55 = Java 11
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56 = Java 12
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57 = Java 13