public class RuntimeTest
{
public static void main(String args[])
    {
        Runtime rtime = Runtime.getRuntime();
        long totalMemory = rtime.totalMemory()/1024;
        long freeMemory = rtime.freeMemory()/1024;      
        System.out.println("totalMemory: " + totalMemory + "k");
        System.out.println("freeMemory: " + freeMemory+ "k");      
    }
}
程序运行结果为：
totalMemory: 1984k
freeMemory: 1734k

public class RuntimeTest
{
public static void main(String args[])
    {
        Runtime rtime = Runtime.getRuntime();
        long totalMemory = rtime.totalMemory()/1024;
        long freeMemory = rtime.freeMemory()/1024;      
        System.out.println("totalMemory: " + totalMemory + "k");
        System.out.println("freeMemory: " + freeMemory+ "k");      
    }
}
程序运行结果为：
totalMemory: 1984k
freeMemory: 1734k