java 检测 Java 是否运行在64bit 的JVM上详解编程语言

public static boolean is64BitVM() {   
      String bits = System.getProperty("sun.arch.data.model");   
      if (bits != null) {   
         return bits.equals("64");   
      } else {   
         // probably sun.arch.data.model isn't available   
         // maybe not a Sun JVM?   
         // try with the vm.name property   
         return System.getProperty("java.vm.name").contains("64");   
      }    
    }