Java Runtime用法实战案例

public class GetRuntimeInfo
{
  public static void main(String args[])
  {
 @SuppressWarnings("unused")
 Runtime run = Runtime.getRuntime(); // 单例设计
    String str = "";          //定义一个字符串
    for (int x = 0; x < 5000; x++)
    {
      str += x;            // 垃圾产生
    }
    System.out.println("1、最大可用内存：" + run.maxMemory());
    System.out.println("1、总共可用内存：" + run.totalMemory());
    System.out.println("1、最大可用内存：" + run.freeMemory());
    System.out.println("1、可用处理器数：" + run.availableProcessors());
    run.gc();              // 清除垃圾
    System.out.println("------------------------------------");
    System.out.println("2、最大可用内存：" + run.maxMemory());
    System.out.println("2、总共可用内存：" + run.totalMemory());
    System.out.println("2、最大可用内存：" + run.freeMemory());
    System.out.println("2、可用处理器数：" + run.availableProcessors());
  }
}