先给你个例子！具体的你出看一下RUNTIME类!
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class exp1
{
public static void main(String args[])
{
Runtime rt=Runtime.getRuntime();
System.out.println("Free Memory:"+(long)(rt.freeMemory()/1024)+"KB");
System.out.println("Total Memory:"+(long)(rt.totalMemory()/1024)+"KB");
}
}
