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WeakRef.java
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157 lines (129 loc) · 3.46 KB
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package WeakRef;
import java.lang.ref.WeakReference;
public class WeakRef {
class Engine {
int count=0;
public void run()
{
System.out.print("\r");
System.out.print("Engine "+count++);
}
}
Engine EngineStrong;
public static void main(String[] args) {
StackTraceElement[] stack = Thread.currentThread ().getStackTrace ();
StackTraceElement main = stack[stack.length - 1];
String mainClass = main.getClassName ();
int mode=0;
if (args.length !=1)
{
System.out.println(mainClass+": Missing Argument noref | local | class | classgc");
System.exit(0);
}
else if (args[0].equals("noref")) mode=1;
else if (args[0].equals("local")) mode=2;
else if (args[0].equals("class")) mode=3;
else if (args[0].equals("classgc")) mode=4;
else
{
System.out.println(mainClass+": Invalid argument "+args[0]+" must be either noref | local | class | classgc");
System.exit(0);
}
WeakRef demo=new WeakRef();
demo.MainRun(mode);
}
public void MainRun(int mode)
{
Engine EngineLocal;
WeakReference<Engine> EngineWeak=null;
// EngineLocal=new Engine();
if (mode==2)
{
EngineLocal=new Engine();
EngineWeak=new WeakReference<Engine> (EngineLocal);
System.out.println("Mode local ref");
System.out.println();
}
while(mode!=7)
{
Runtime.getRuntime().gc();
EngineWeak.get().run();
}
}
}
/*
import java.lang.ref.WeakReference;
public class DemoWeak {
class Engine {
int count=0;
public void run()
{
// System.out.print("\33[1A\33[2K");
System.out.printf("\r");
System.out.println("Engine "+count++);
}
}
Engine EngineStrong;
public static void main(String[] args) {
StackTraceElement[] stack = Thread.currentThread ().getStackTrace ();
StackTraceElement main = stack[stack.length - 1];
String mainClass = main.getClassName ();
int mode=0;
if (args.length !=1)
{
System.out.println(mainClass+": Missing Argument noref | local | class | classgc");
System.exit(0);
}
else if (args[0].equals("noref")) mode=1;
else if (args[0].equals("local")) mode=2;
else if (args[0].equals("class")) mode=3;
else if (args[0].equals("classgc")) mode=4;
else
{
System.out.println(mainClass+": Invalid argument "+args[0]+" must be either noref | local | class | classgc");
System.exit(0);
}
DemoWeak demo=new DemoWeak();
demo.MainRun(mode);
}
public void MainRun(int mode)
{
Engine EngineLocal;
WeakReference<Engine> EngineWeak=null;
if (mode==1)
{
EngineWeak=new WeakReference<Engine> (new Engine());
System.out.println("Mode noref");
}
else if (mode==2)
{
EngineLocal=new Engine();
EngineWeak=new WeakReference<Engine> (EngineLocal);
System.out.println("Mode local ref");
}
else if (mode==3)
{
EngineStrong=new Engine();
EngineWeak=new WeakReference<Engine> (EngineStrong);
System.out.println("Mode class strong ref");
}
else if (mode==4)
{
EngineStrong=new Engine();
EngineWeak=new WeakReference<Engine> (EngineStrong);
System.out.println("Mode class strong ref with gc");
}
else
{
System.out.println("Invalid Mode");
System.exit(0);
}
System.out.println();
while(true)
{
if (mode==4) Runtime.getRuntime().gc();
EngineWeak.get().run();
}
}
}
*/