java开发_Runtime

 1 public static void main(String[] a){
 2         Runtime runtime = Runtime.getRuntime();
 3         long freeMemoery = runtime.freeMemory();
 4         long totalMemory = runtime.totalMemory();
 5         long usedMemory = totalMemory - freeMemoery;
 6         long maxMemory = runtime.maxMemory();
 7         long useableMemory = maxMemory - totalMemory + freeMemoery;
 8         
 9         System.out.println("当前时间："+runtime);
10         System.out.println("系统闲置空间："+freeMemoery);
11         System.out.println("系统总空间："+totalMemory);
12         System.out.println("系统被用的空间："+usedMemory);
13         System.out.println("系统最大空间："+maxMemory);
14         System.out.println("系统可用空间："+useableMemory);
15     }

1 当前时间：java.lang.Runtime@c3c749
2 系统闲置空间：4873672
3 系统总空间：5177344
4 系统被用的空间：303672
5 系统最大空间：66650112
6 系统可用空间：66346440