gctest3.java

来自「j2se5.0全方位学习一书源代码」· Java 代码 · 共 32 行

public class GCTest3
{
	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 obj2 = new MyObject(2);
		MyObject obj1 = new MyObject(1);
                MyObject obj3 = new MyObject(3);
		obj2 = new MyObject(4); 
		System.out.println("After created three MyObject objects...");
                System.out.println("Free / Total memory (bytes):"+
			rt.freeMemory()+" / "+rt.totalMemory());

		obj3 = null;
		obj1 = null;
		obj2 = 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());  
	}
}