java.lang.NumberFormatException 错误及解决办法

OperatingSystemMXBean osmb = (OperatingSystemMXBean) ManagementFactory
.getOperatingSystemMXBean();
// 内存
String memory = osmb.getTotalPhysicalMemorySize()
+ "B";
System.out.println(memory);
MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
Object attribute = null;
try {
attribute = mBeanServer.getAttribute(new ObjectName("java.lang","type","OperatingSystem"), "TotalPhysicalMemorySize");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("Total memory: "+ attribute.toString() +"B");
System.out.println("Total memory: "+ Integer.parseInt(attribute.toString()) +"MB");
System.out.println("Total memory: "+ Long.parseLong(attribute.toString())/ 1024L/1024L/1024L +"G");

4294967295B
Total memory: 4294967295B
Exception in thread "main" java.lang.NumberFormatException: For input string: "4294967295"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:461)
at java.lang.Integer.parseInt(Integer.java:499)
at com.travelsky.angel.client.base.util.LocIpMacCompName.main(LocIpMacCompName.java:174)

<pre name="code" class="java"><strong><span style="font-size:18px;">解决方案：</span></strong>

由于int 类型最大范围是-2147483648－2147483647 ，超出他的范围所以会犯错，直接拿long型转就好了。

有时可能也会出现空格的情况，trim()掉就可以了。