gctest2.java

初学者很好的一本入门书籍

public class GCTest2
{
	public static void main(String argv[])
	{
		Runtime rt = Runtime.getRuntime();

		System.out.println("Program start...");
		System.out.println("Free / Total memory (bytes):"+
			rt.freeMemory()+" / "+rt.totalMemory());

		MyObject obj1 = new MyObject(1);
                MyObject obj2 = new MyObject(2); 
                MyObject obj3 = new MyObject(3); 
		System.out.println("After created three MyObject objects...");
                System.out.println("Free / Total memory (bytes):"+
			rt.freeMemory()+" / "+rt.totalMemory());

		obj1 = null;
		obj2 = null;
		obj3 = null;
                System.out.println("After released MyObject objects...");
                System.out.println("Free / Total memory (bytes):"+
                        rt.freeMemory()+" / "+rt.totalMemory());

		System.gc();
                System.out.println("After run System.gc()...");
                System.out.println("Free / Total memory (bytes):"+
                        rt.freeMemory()+" / "+rt.totalMemory());  
	}
}