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());  }}