Progmatically checking Java version and its runtime version

This code snippet will you let you know which java version and JRE version you are using and your code is executing in which environement

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String[] pro = { "java.version", "java.vm.version"  };      Properties properties = System.getProperties();    for (int i = 0; i < pro.length; i++) {     System.out.print(pro[i]+"\t\t: ");     System.out.println(properties.getProperty(pro[i]));    }