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Get Java Version As Integer
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| public final class JavaVersionUtil12 { | |
| private JavaVersionUtil12() { | |
| } | |
| public static Integer getJavaVersionAsInteger() { | |
| // | |
| if (forName("java.lang.WrongThreadException") != null) { | |
| // | |
| return new Integer(19); | |
| // | |
| } else if (forName("java.net.spi.InetAddressResolver") != null) { | |
| // | |
| return new Integer(18); | |
| // | |
| } else if (forName("java.util.random.RandomGeneratorFactory") != null) { | |
| // | |
| return new Integer(17); | |
| // | |
| } else if (forName("java.net.UnixDomainSocketAddress") != null) { | |
| // | |
| return new Integer(16); | |
| // | |
| } else if (forName("java.security.interfaces.EdECKey") != null) { | |
| // | |
| return new Integer(15); | |
| // | |
| } else if (forName("java.io.Serial") != null) { | |
| // | |
| return new Integer(14); | |
| // | |
| } else if (forName("com.sun.source.util.ParameterNameProvider") != null) { | |
| // | |
| return new Integer(13); | |
| // | |
| } else if (forName("com.sun.source.doctree.SystemPropertyTree") != null) { | |
| // | |
| return new Integer(12); | |
| // | |
| } else if (forName("java.net.http.HttpClient") != null) { | |
| // | |
| return new Integer(11); | |
| // | |
| } else if (forName("com.sun.source.doctree.SummaryTree") != null) { | |
| // | |
| return new Integer(10); | |
| // | |
| } else if (forName("java.lang.Module") != null) { | |
| // | |
| return new Integer(9); | |
| // | |
| } else if (forName("java.util.stream.Stream") != null) { | |
| // | |
| return new Integer(8); | |
| // | |
| } else if (forName("java.nio.file.attribute.FileAttribute") != null) { | |
| // | |
| return new Integer(7); | |
| // | |
| } else if (forName("java.io.Console") != null) { | |
| // | |
| return new Integer(6); | |
| // | |
| } else if (forName("java.lang.ProcessBuilder") != null) { | |
| // | |
| return new Integer(5); | |
| // | |
| } else if (forName("java.nio.ByteBuffer") != null) { | |
| // | |
| return new Integer(4); | |
| // | |
| } else if (forName("java.lang.reflect.InvocationHandler") != null) { | |
| // | |
| return new Integer(3); | |
| // | |
| } else if (forName("java.util.Collection") != null) { | |
| // | |
| return new Integer(2); | |
| // | |
| } else if (forName("java.lang.Object") != null) { | |
| // | |
| return new Integer(1); | |
| // | |
| } // if | |
| // | |
| return null; | |
| // | |
| } | |
| private static Class forName(final String className) { | |
| // | |
| try { | |
| // | |
| return Class.forName(className); | |
| // | |
| } catch (final ClassNotFoundException e) { | |
| // | |
| return null; | |
| // | |
| } // try | |
| // | |
| } | |
| public static void main(final String[] args) { | |
| // | |
| System.out.println(getJavaVersionAsInteger()); | |
| // | |
| } | |
| } |
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Rename the JavaVersionUtil.class.jpg into JavaVersionUtil.class
Compilation
C:\jdk1.2.2\bin\javac.exe JavaVersionUtil.java
Run
C:\jdk1.2.2\bin\java JavaVersionUtil
C:\jdk1.3.1_28\bin\java JavaVersionUtil
C:\j2sdk1.4.2_19\bin\java JavaVersionUtil
"C:/Program Files (x86)/Java/jdk1.5.0_22/bin/java" -cp . JavaVersionUtil
"C:/Program Files (x86)/Java/jdk1.6.0_45/bin/java" -cp . JavaVersionUtil
"C:/Program Files (x86)/Java/jdk1.7.0_80/bin/java" -cp . JavaVersionUtil
"C:/Program Files (x86)/Java/jdk1.8.0_361/bin/java" -cp . JavaVersionUtil
"C:/Program Files/Java/jdk1.8.0_361/bin/java" -cp . JavaVersionUtil
"C:/Program Files/Java/jdk-9.0.4/bin/java" -cp . JavaVersionUtil
"C:/Program Files/Java/jdk-10.0.2/bin/java" -cp . JavaVersionUtil
"C:/Program Files/Java/jdk-11/bin/java" -cp . JavaVersionUtil
"C:/Program Files/Java/jdk-12.0.2/bin/java" -cp . JavaVersionUtil
"C:/Program Files/Java/jdk-13.0.2/bin/java" -cp . JavaVersionUtil
"C:/Program Files/Java/jdk-14.0.2/bin/java" -cp . JavaVersionUtil
"C:/Program Files/Java/jdk-15.0.2/bin/java" -cp . JavaVersionUtil
"C:/Program Files/Java/jdk-16.0.2/bin/java" -cp . JavaVersionUtil
"C:/Program Files/Java/jdk-17/bin/java" -cp . JavaVersionUtil
"C:/Program Files/Java/jdk-18.0.2.1/bin/java" -cp . JavaVersionUtil
"C:/Program Files/Java/jdk-19/bin/java" -cp . JavaVersionUtil