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import java.util.Set;
import javax.lang.model.SourceVersion;
import javax.tools.JavaCompiler;
import javax.tools.ToolProvider;
public class CompilerInfo {
public static void main(String[] args) {
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
System.out.println("Supported source versions:");
Set<SourceVersion> srcVer = compiler.getSourceVersions();
for (SourceVersion sv : srcVer)
System.out.println(" " + sv.name());
int nargs = compiler.isSupportedOption(args[0]);
if (nargs == -1)
System.out.println("Option " + args[0] + " is not supported");
else
System.out.println("Option " + args[0] + " takes " + nargs + " arguments");
}
}
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