TestVolatile.java

public class TestVolatile {

	volatile private boolean v = true;
	private boolean n = true;
	
	void invokeLoop(final boolean isVolatile){
		Thread t = new Thread(){
			@Override
			public void run(){
				while(true){
					if(isVolatile){
						if(v){
							System.out.println("volatile been changed.");
							v = false;
						}
					}else{
						if(n){
							System.out.println("non-volatile been changed.");
							n = false;
						}
					}
				}
			}
		};
		
		t.start();
		
		while(true){
			if(isVolatile){
				if(!v){
					v = true;
					System.out.println("change volatile");
				}

			}else{
				if(!n){
					n = true;
					System.out.println("change non-volatile");			
				}			
			}
			
		}
	}
	
	public static void main(String[] avg){
		new TestVolatile().invokeLoop(true);
	}
}

isVolatile -> 交替輸出
!isVolatile -> 輸出一陣子就沒了